CSimple

Since Camel 3.7

The CSimple language is compiled Simple language.

Different between CSimple and Simple

The simple language is a dynamic expression language which is runtime parsed into a set of Camel Expressions or Predicates.

The csimple language is parsed into regular Java source code and compiled together with all the other source code, or compiled once during bootstrap via the camel-csimple-joor module.

The simple language is generally very lightweight and fast, however for some use-cases with dynamic method calls via OGNL paths, then the simple language does runtime introspection and reflection calls. This has an overhead on performance, and was one of the reasons why csimple was created.

The csimple language requires to be typesafe and method calls via OGNL paths requires to know the type during parsing. This means for csimple languages expressions you would need to provide the class type in the script, whereas simple introspects this at runtime.

In other words the simple language is using duck typing (if it looks like a duck, and quacks like a duck, then it is a duck) and csimple is using Java type (typesafety). If there is a type error then simple will report this at runtime, and with csimple there will be a Java compilation error.

Additional CSimple functions

The csimple language includes some additional functions to support common use-cases working with Collection, Map or array types. The following functions bodyAsIndex, headerAsIndex, and exchangePropertyAsIndex is used for these use-cases as they are typed.

Function Type Description

Function	Type	Description
bodyAsIndex(type, index)	Type	To be used for collecting the body from an existing `Collection`, `Map` or array (lookup by the index) and then converting the body to the given type determined by its classname. The converted body can be null.
mandatoryBodyAsIndex(type, index)	Type	To be used for collecting the body from an existing `Collection`, `Map` or array (lookup by the index) and then converting the body to the given type determined by its classname. Expects the body to be not null.
headerAsIndex(key, type, index)	Type	To be used for collecting a header from an existing `Collection`, `Map` or array (lookup by the index) and then converting the header value to the given type determined by its classname. The converted header can be null.
exchangePropertyAsIndex(key, type, index)	Type	To be used for collecting an exchange property from an existing `Collection`, `Map` or array (lookup by the index) and then converting the exchange property to the given type determined by its classname. The converted exchange property can be null.
variableAsIndex(key, type, index)	Type	To be used for collecting a variable from an existing `Collection`, `Map` or array (lookup by the index) and then converting the variable to the given type determined by its classname. The converted variable can be null.
messageAs(type)	Type	Converts the message to the given type determined by its classname. The converted message can be null.

bodyAsIndex(type, index)

Type

To be used for collecting the body from an existing Collection, Map or array (lookup by the index) and then converting the body to the given type determined by its classname. The converted body can be null.

mandatoryBodyAsIndex(type, index)

Type

To be used for collecting the body from an existing Collection, Map or array (lookup by the index) and then converting the body to the given type determined by its classname. Expects the body to be not null.

headerAsIndex(key, type, index)

Type

To be used for collecting a header from an existing Collection, Map or array (lookup by the index) and then converting the header value to the given type determined by its classname. The converted header can be null.

exchangePropertyAsIndex(key, type, index)

Type

To be used for collecting an exchange property from an existing Collection, Map or array (lookup by the index) and then converting the exchange property to the given type determined by its classname. The converted exchange property can be null.

variableAsIndex(key, type, index)

Type

To be used for collecting a variable from an existing Collection, Map or array (lookup by the index) and then converting the variable to the given type determined by its classname. The converted variable can be null.

messageAs(type)

Type

Converts the message to the given type determined by its classname. The converted message can be null.

For example given the following simple expression:

Hello ${body[0].name}

This script has no type information, and the simple language will resolve this at runtime, by introspecting the message body and if it’s a collection based then lookup the first element, and then invoke a method named getName via reflection.

In csimple (compiled) we want to pre compile this and therefore the end user must provide type information with the bodyAsIndex function:

Hello ${bodyAsIndex(com.foo.MyUser, 0).name}

Compilation

The csimple language is parsed into regular Java source code and compiled together with all the other source code, or it can be compiled once during bootstrap via the camel-csimple-joor module.

There are two ways to compile csimple

using the camel-csimple-maven-plugin generating source code at built time.
using camel-csimple-joor which does runtime in-memory compilation during bootstrap of Camel.

Using camel-csimple-maven-plugin

The camel-csimple-maven-plugin Maven plugin is used for discovering all the csimple scripts from the source code, and then automatic generate source code in the src/generated/java folder, which then gets compiled together with all the other sources.

The maven plugin will do source code scanning of .java and .xml files (Java and XML DSL). The scanner limits to detect certain code patterns, and it may miss discovering some csimple scripts if they are being used in unusual/rare ways.

The runtime compilation using camel-csimple-joor does not have this limitation.

The benefit is all the csimple scripts will be compiled using the regular Java compiler and therefore everything is included out of the box as .class files in the application JAR file, and no additional dependencies is required at runtime.

To use camel-csimple-maven-plugin you need to add it to your pom.xml file as shown:

<plugins>
    <!-- generate source code for csimple languages -->
    <plugin>
        <groupId>org.apache.camel</groupId>
        <artifactId>camel-csimple-maven-plugin</artifactId>
        <version>${camel.version}</version>
        <executions>
            <execution>
                <id>generate</id>
                <goals>
                    <goal>generate</goal>
                </goals>
            </execution>
        </executions>
    </plugin>
    <!-- include source code generated to maven sources paths -->
    <plugin>
        <groupId>org.codehaus.mojo</groupId>
        <artifactId>build-helper-maven-plugin</artifactId>
        <version>3.1.0</version>
        <executions>
            <execution>
                <phase>generate-sources</phase>
                <goals>
                    <goal>add-source</goal>
                    <goal>add-resource</goal>
                </goals>
                <configuration>
                    <sources>
                        <source>src/generated/java</source>
                    </sources>
                    <resources>
                        <resource>
                            <directory>src/generated/resources</directory>
                        </resource>
                    </resources>
                </configuration>
            </execution>
        </executions>
    </plugin>
</plugins>

And then you must also add the build-helper-maven-plugin Maven plugin to include src/generated to the list of source folders for the Java compiler, to ensure the generated source code is compiled and included in the application JAR file.

See the camel-example-csimple example at Camel Examples which uses the maven plugin.

Using camel-csimple-joor

The jOOR library integrates with the Java compiler and performs runtime compilation of Java code.

The supported runtime when using camel-simple-joor is intended for Java standalone, Spring Boot, Camel Quarkus and other microservices runtimes. It is not supported on any kind of Java Application Server runtime.

jOOR does not support runtime compilation with Spring Boot using fat jar packaging (https://github.com/jOOQ/jOOR/issues/69), it works with exploded classpath.

To use camel-simple-joor you simply just add it as dependency to the classpath:

<dependency>
  <groupId>org.apache.camel</groupId>
  <artifactId>camel-csimple-joor</artifactId>
  <version>x.x.x</version>
</dependency>

There is no need for adding Maven plugins to the pom.xml file.

See the camel-example-csimple-joor example at Camel Examples which uses the jOOR compiler.

CSimple Language options

The CSimple language supports 2 options, which are listed below.

Name Default Java Type Description

Name	Default	Java Type	Description
resultType (common)		`String`	Sets the class of the result type (type from output).
trim (advanced)	`true`	`Boolean`	Whether to trim the value to remove leading and trailing whitespaces and line breaks.

resultType (common)

String

Sets the class of the result type (type from output).

trim (advanced)

true

Boolean

Whether to trim the value to remove leading and trailing whitespaces and line breaks.

Limitations

Currently, the csimple language does not support:

nested functions (aka functions inside functions)
the null safe operator (?).

For example the following scripts cannot compile:

    Hello ${bean:greeter(${body}, ${header.counter})}

    ${bodyAs(MyUser)?.address?.zip} > 10000

Auto imports

The csimple language will automatically import from:

import java.util.*;
import java.util.concurrent.*;
import java.util.stream.*;
import org.apache.camel.*;
import org.apache.camel.util.*;

Configuration file

You can configure the csimple language in the camel-csimple.properties file which is loaded from the root classpath.

For example you can add additional imports in the camel-csimple.properties file by adding:

import com.foo.MyUser;
import com.bar.*;
import static com.foo.MyHelper.*;

You can also add aliases (key=value) where an alias will be used as a shorthand replacement in the code.

echo()=${bodyAs(String)} ${bodyAs(String)}

Which allows to use echo() in the csimple language script such as:

from("direct:hello")
    .transform(csimple("Hello echo()"))
    .log("You said ${body}");

The echo() alias will be replaced with its value resulting in a script as:

    .transform(csimple("Hello ${bodyAs(String)} ${bodyAs(String)}"))

Spring Boot Auto-Configuration

When using csimple with Spring Boot make sure to use the following Maven dependency to have support for auto configuration:

<dependency>
  <groupId>org.apache.camel.springboot</groupId>
  <artifactId>camel-core-starter</artifactId>
  <version>x.x.x</version>
  <!-- use the same version as your Camel core version -->
</dependency>

The component supports 112 options, which are listed below.

Name	Description	Default	Type
camel.cloud.consul.service-discovery.acl-token	Sets the ACL token to be used with Consul.		String
camel.cloud.consul.service-discovery.block-seconds	The seconds to wait for a watch event, default 10 seconds.	10	Integer
camel.cloud.consul.service-discovery.configurations	Define additional configuration definitions.		Map
camel.cloud.consul.service-discovery.connect-timeout-millis	Connect timeout for OkHttpClient.		Long
camel.cloud.consul.service-discovery.datacenter	The data center.		String
camel.cloud.consul.service-discovery.enabled	Enable the component.	true	Boolean
camel.cloud.consul.service-discovery.password	Sets the password to be used for basic authentication.		String
camel.cloud.consul.service-discovery.properties	Set client properties to use. These properties are specific to what service call implementation are in use. For example if using a different one, then the client properties are defined according to the specific service in use.		Map
camel.cloud.consul.service-discovery.read-timeout-millis	Read timeout for OkHttpClient.		Long
camel.cloud.consul.service-discovery.url	The Consul agent URL.		String
camel.cloud.consul.service-discovery.user-name	Sets the username to be used for basic authentication.		String
camel.cloud.consul.service-discovery.write-timeout-millis	Write timeout for OkHttpClient.		Long
camel.cloud.dns.service-discovery.configurations	Define additional configuration definitions.		Map
camel.cloud.dns.service-discovery.domain	The domain name;.		String
camel.cloud.dns.service-discovery.enabled	Enable the component.	true	Boolean
camel.cloud.dns.service-discovery.properties	Set client properties to use. These properties are specific to what service call implementation are in use. For example if using a different one, then the client properties are defined according to the specific service in use.		Map
camel.cloud.dns.service-discovery.proto	The transport protocol of the desired service.	_tcp	String
camel.cloud.kubernetes.service-discovery.api-version	Sets the API version when using client lookup.		String
camel.cloud.kubernetes.service-discovery.ca-cert-data	Sets the Certificate Authority data when using client lookup.		String
camel.cloud.kubernetes.service-discovery.ca-cert-file	Sets the Certificate Authority data that are loaded from the file when using client lookup.		String
camel.cloud.kubernetes.service-discovery.client-cert-data	Sets the Client Certificate data when using client lookup.		String
camel.cloud.kubernetes.service-discovery.client-cert-file	Sets the Client Certificate data that are loaded from the file when using client lookup.		String
camel.cloud.kubernetes.service-discovery.client-key-algo	Sets the Client Keystore algorithm, such as RSA when using client lookup.		String
camel.cloud.kubernetes.service-discovery.client-key-data	Sets the Client Keystore data when using client lookup.		String
camel.cloud.kubernetes.service-discovery.client-key-file	Sets the Client Keystore data that are loaded from the file when using client lookup.		String
camel.cloud.kubernetes.service-discovery.client-key-passphrase	Sets the Client Keystore passphrase when using client lookup.		String
camel.cloud.kubernetes.service-discovery.configurations	Define additional configuration definitions.		Map
camel.cloud.kubernetes.service-discovery.dns-domain	Sets the DNS domain to use for DNS lookup.		String
camel.cloud.kubernetes.service-discovery.enabled	Enable the component.	true	Boolean
camel.cloud.kubernetes.service-discovery.lookup	How to perform service lookup. Possible values: client, dns, environment. When using client, then the client queries the kubernetes master to obtain a list of active pods that provides the service, and then random (or round robin) select a pod. When using dns the service name is resolved as name.namespace.svc.dnsDomain. When using dnssrv the service name is resolved with SRV query for .…svc… When using environment then environment variables are used to lookup the service. By default environment is used.	environment	String
camel.cloud.kubernetes.service-discovery.master-url	Sets the URL to the master when using client lookup.		String
camel.cloud.kubernetes.service-discovery.namespace	Sets the namespace to use. Will by default use namespace from the ENV variable KUBERNETES_MASTER.		String
camel.cloud.kubernetes.service-discovery.oauth-token	Sets the OAUTH token for authentication (instead of username/password) when using client lookup.		String
camel.cloud.kubernetes.service-discovery.password	Sets the password for authentication when using client lookup.		String
camel.cloud.kubernetes.service-discovery.port-name	Sets the Port Name to use for DNS/DNSSRV lookup.		String
camel.cloud.kubernetes.service-discovery.port-protocol	Sets the Port Protocol to use for DNS/DNSSRV lookup.		String
camel.cloud.kubernetes.service-discovery.properties	Set client properties to use. These properties are specific to what service call implementation are in use. For example if using a different one, then the client properties are defined according to the specific service in use.		Map
camel.cloud.kubernetes.service-discovery.trust-certs	Sets whether to turn on trust certificate check when using client lookup.	false	Boolean
camel.cloud.kubernetes.service-discovery.username	Sets the username for authentication when using client lookup.		String
camel.language.constant.enabled	Whether to enable auto configuration of the constant language. This is enabled by default.		Boolean
camel.language.constant.trim	Whether to trim the value to remove leading and trailing whitespaces and line breaks.	true	Boolean
camel.language.csimple.enabled	Whether to enable auto configuration of the csimple language. This is enabled by default.		Boolean
camel.language.csimple.trim	Whether to trim the value to remove leading and trailing whitespaces and line breaks.	true	Boolean
camel.language.exchange-property.enabled	Whether to enable auto configuration of the exchangeProperty language. This is enabled by default.		Boolean
camel.language.exchange-property.trim	Whether to trim the value to remove leading and trailing whitespaces and line breaks.	true	Boolean
camel.language.file.enabled	Whether to enable auto configuration of the file language. This is enabled by default.		Boolean
camel.language.file.trim	Whether to trim the value to remove leading and trailing whitespaces and line breaks.	true	Boolean
camel.language.header.enabled	Whether to enable auto configuration of the header language. This is enabled by default.		Boolean
camel.language.header.trim	Whether to trim the value to remove leading and trailing whitespaces and line breaks.	true	Boolean
camel.language.ref.enabled	Whether to enable auto configuration of the ref language. This is enabled by default.		Boolean
camel.language.ref.trim	Whether to trim the value to remove leading and trailing whitespaces and line breaks.	true	Boolean
camel.language.simple.enabled	Whether to enable auto configuration of the simple language. This is enabled by default.		Boolean
camel.language.simple.trim	Whether to trim the value to remove leading and trailing whitespaces and line breaks.	true	Boolean
camel.language.tokenize.enabled	Whether to enable auto configuration of the tokenize language. This is enabled by default.		Boolean
camel.language.tokenize.group-delimiter	Sets the delimiter to use when grouping. If this has not been set then token will be used as the delimiter.		String
camel.language.tokenize.source	Source to use, instead of message body. You can prefix with variable:, header:, or property: to specify kind of source. Otherwise, the source is assumed to be a variable. Use empty or null to use default source, which is the message body.		String
camel.language.tokenize.trim	Whether to trim the value to remove leading and trailing whitespaces and line breaks.	true	Boolean
camel.language.variable.enabled	Whether to enable auto configuration of the variable language. This is enabled by default.		Boolean
camel.language.variable.trim	Whether to trim the value to remove leading and trailing whitespaces and line breaks.	true	Boolean
camel.resilience4j.automatic-transition-from-open-to-half-open-enabled	Enables automatic transition from OPEN to HALF_OPEN state once the waitDurationInOpenState has passed.	false	Boolean
camel.resilience4j.bulkhead-enabled	Whether bulkhead is enabled or not on the circuit breaker. Default is false.	false	Boolean
camel.resilience4j.bulkhead-max-concurrent-calls	Configures the max amount of concurrent calls the bulkhead will support.	25	Integer
camel.resilience4j.bulkhead-max-wait-duration	Configures a maximum amount of time which the calling thread will wait to enter the bulkhead. If bulkhead has space available, entry is guaranteed and immediate. If bulkhead is full, calling threads will contest for space, if it becomes available. maxWaitDuration can be set to 0. Note: for threads running on an event-loop or equivalent (rx computation pool, etc), setting maxWaitDuration to 0 is highly recommended. Blocking an event-loop thread will most likely have a negative effect on application throughput.	0	Integer
camel.resilience4j.circuit-breaker	Refers to an existing io.github.resilience4j.circuitbreaker.CircuitBreaker instance to lookup and use from the registry. When using this, then any other circuit breaker options are not in use.		String
camel.resilience4j.config	Refers to an existing io.github.resilience4j.circuitbreaker.CircuitBreakerConfig instance to lookup and use from the registry.		String
camel.resilience4j.configurations	Define additional configuration definitions.		Map
camel.resilience4j.enabled	Enable the component.	true	Boolean
camel.resilience4j.failure-rate-threshold	Configures the failure rate threshold in percentage. If the failure rate is equal or greater than the threshold the CircuitBreaker transitions to open and starts short-circuiting calls. The threshold must be greater than 0 and not greater than 100. Default value is 50 percentage.		Float
camel.resilience4j.ignore-exception	Configure a list of exceptions that are ignored and neither count as a failure nor success. Any exception matching or inheriting from one of the list will not count as a failure nor success, even if the exceptions is part of recordExceptions.		List
camel.resilience4j.minimum-number-of-calls	Configures the minimum number of calls which are required (per sliding window period) before the CircuitBreaker can calculate the error rate. For example, if minimumNumberOfCalls is 10, then at least 10 calls must be recorded, before the failure rate can be calculated. If only 9 calls have been recorded the CircuitBreaker will not transition to open even if all 9 calls have failed. Default minimumNumberOfCalls is 100.	100	Integer
camel.resilience4j.permitted-number-of-calls-in-half-open-state	Configures the number of permitted calls when the CircuitBreaker is half open. The size must be greater than 0. Default size is 10.	10	Integer
camel.resilience4j.record-exception	Configure a list of exceptions that are recorded as a failure and thus increase the failure rate. Any exception matching or inheriting from one of the list counts as a failure, unless explicitly ignored via ignoreExceptions.		List
camel.resilience4j.sliding-window-size	Configures the size of the sliding window which is used to record the outcome of calls when the CircuitBreaker is closed. slidingWindowSize configures the size of the sliding window. Sliding window can either be count-based or time-based. If slidingWindowType is COUNT_BASED, the last slidingWindowSize calls are recorded and aggregated. If slidingWindowType is TIME_BASED, the calls of the last slidingWindowSize seconds are recorded and aggregated. The slidingWindowSize must be greater than 0. The minimumNumberOfCalls must be greater than 0. If the slidingWindowType is COUNT_BASED, the minimumNumberOfCalls cannot be greater than slidingWindowSize . If the slidingWindowType is TIME_BASED, you can pick whatever you want. Default slidingWindowSize is 100.	100	Integer
camel.resilience4j.sliding-window-type	Configures the type of the sliding window which is used to record the outcome of calls when the CircuitBreaker is closed. Sliding window can either be count-based or time-based. If slidingWindowType is COUNT_BASED, the last slidingWindowSize calls are recorded and aggregated. If slidingWindowType is TIME_BASED, the calls of the last slidingWindowSize seconds are recorded and aggregated. Default slidingWindowType is COUNT_BASED.	COUNT_BASED	String
camel.resilience4j.slow-call-duration-threshold	Configures the duration threshold (seconds) above which calls are considered as slow and increase the slow calls percentage. Default value is 60 seconds.	60	Integer
camel.resilience4j.slow-call-rate-threshold	Configures a threshold in percentage. The CircuitBreaker considers a call as slow when the call duration is greater than slowCallDurationThreshold Duration. When the percentage of slow calls is equal or greater the threshold, the CircuitBreaker transitions to open and starts short-circuiting calls. The threshold must be greater than 0 and not greater than 100. Default value is 100 percentage which means that all recorded calls must be slower than slowCallDurationThreshold.		Float
camel.resilience4j.throw-exception-when-half-open-or-open-state	Whether to throw io.github.resilience4j.circuitbreaker.CallNotPermittedException when the call is rejected due circuit breaker is half open or open.	false	Boolean
camel.resilience4j.timeout-cancel-running-future	Configures whether cancel is called on the running future. Defaults to true.	true	Boolean
camel.resilience4j.timeout-duration	Configures the thread execution timeout. Default value is 1 second.	1000	Integer
camel.resilience4j.timeout-enabled	Whether timeout is enabled or not on the circuit breaker. Default is false.	false	Boolean
camel.resilience4j.timeout-executor-service	References to a custom thread pool to use when timeout is enabled (uses ForkJoinPool#commonPool() by default).		ExecutorService
camel.resilience4j.wait-duration-in-open-state	Configures the wait duration (in seconds) which specifies how long the CircuitBreaker should stay open, before it switches to half open. Default value is 60 seconds.	60	Integer
camel.resilience4j.writable-stack-trace-enabled	Enables writable stack traces. When set to false, Exception.getStackTrace returns a zero length array. This may be used to reduce log spam when the circuit breaker is open as the cause of the exceptions is already known (the circuit breaker is short-circuiting calls).	true	Boolean
camel.rest.api-component	The name of the Camel component to use as the REST API. If no API Component has been explicit configured, then Camel will lookup if there is a Camel component responsible for servicing and generating the REST API documentation, or if a org.apache.camel.spi.RestApiProcessorFactory is registered in the registry. If either one is found, then that is being used.		String
camel.rest.api-context-path	Sets a leading context-path the REST API will be using. This can be used when using components such as camel-servlet where the deployed web application is deployed using a context-path.		String
camel.rest.api-context-route-id	Sets the route id to use for the route that services the REST API. The route will by default use an auto assigned route id.		String
camel.rest.api-host	To use a specific hostname for the API documentation (such as swagger or openapi) This can be used to override the generated host with this configured hostname.		String
camel.rest.api-property	Allows to configure as many additional properties for the api documentation. For example set property api.title to my cool stuff.		Map
camel.rest.api-vendor-extension	Whether vendor extension is enabled in the Rest APIs. If enabled then Camel will include additional information as vendor extension (eg keys starting with x-) such as route ids, class names etc. Not all 3rd party API gateways and tools supports vendor-extensions when importing your API docs.	false	Boolean
camel.rest.binding-mode	Sets the binding mode to use. The default value is off.		RestBindingMode
camel.rest.binding-package-scan	Package name to use as base (offset) for classpath scanning of POJO classes are located when using binding mode is enabled for JSon or XML. Multiple package names can be separated by comma.		String
camel.rest.client-request-validation	Whether to enable validation of the client request to check: 1) Content-Type header matches what the Rest DSL consumes; returns HTTP Status 415 if validation error. 2) Accept header matches what the Rest DSL produces; returns HTTP Status 406 if validation error. 3) Missing required data (query parameters, HTTP headers, body); returns HTTP Status 400 if validation error. 4) Parsing error of the message body (JSon, XML or Auto binding mode must be enabled); returns HTTP Status 400 if validation error.	false	Boolean
camel.rest.component	The Camel Rest component to use for the REST transport (consumer), such as netty-http, jetty, servlet, undertow. If no component has been explicit configured, then Camel will lookup if there is a Camel component that integrates with the Rest DSL, or if a org.apache.camel.spi.RestConsumerFactory is registered in the registry. If either one is found, then that is being used.		String
camel.rest.component-property	Allows to configure as many additional properties for the rest component in use.		Map
camel.rest.consumer-property	Allows to configure as many additional properties for the rest consumer in use.		Map
camel.rest.context-path	Sets a leading context-path the REST services will be using. This can be used when using components such as camel-servlet where the deployed web application is deployed using a context-path. Or for components such as camel-jetty or camel-netty-http that includes a HTTP server.		String
camel.rest.cors-headers	Allows to configure custom CORS headers.		Map
camel.rest.data-format-property	Allows to configure as many additional properties for the data formats in use. For example set property prettyPrint to true to have json outputted in pretty mode. The properties can be prefixed to denote the option is only for either JSON or XML and for either the IN or the OUT. The prefixes are: json.in. json.out. xml.in. xml.out. For example a key with value xml.out.mustBeJAXBElement is only for the XML data format for the outgoing. A key without a prefix is a common key for all situations.		Map
camel.rest.enable-cors	Whether to enable CORS headers in the HTTP response. The default value is false.	false	Boolean
camel.rest.enable-no-content-response	Whether to return HTTP 204 with an empty body when a response contains an empty JSON object or XML root object. The default value is false.	false	Boolean
camel.rest.endpoint-property	Allows to configure as many additional properties for the rest endpoint in use.		Map
camel.rest.host	The hostname to use for exposing the REST service.		String
camel.rest.host-name-resolver	If no hostname has been explicit configured, then this resolver is used to compute the hostname the REST service will be using.		RestHostNameResolver
camel.rest.inline-routes	Inline routes in rest-dsl which are linked using direct endpoints. Each service in Rest DSL is an individual route, meaning that you would have at least two routes per service (rest-dsl, and the route linked from rest-dsl). By inlining (default) allows Camel to optimize and inline this as a single route, however this requires to use direct endpoints, which must be unique per service. If a route is not using direct endpoint then the rest-dsl is not inlined, and will become an individual route. This option is default true.	true	Boolean
camel.rest.json-data-format	Name of specific json data format to use. By default jackson will be used. Important: This option is only for setting a custom name of the data format, not to refer to an existing data format instance.		String
camel.rest.port	The port number to use for exposing the REST service. Notice if you use servlet component then the port number configured here does not apply, as the port number in use is the actual port number the servlet component is using. eg if using Apache Tomcat its the tomcat http port, if using Apache Karaf its the HTTP service in Karaf that uses port 8181 by default etc. Though in those situations setting the port number here, allows tooling and JMX to know the port number, so its recommended to set the port number to the number that the servlet engine uses.		String
camel.rest.producer-api-doc	Sets the location of the api document the REST producer will use to validate the REST uri and query parameters are valid accordingly to the api document. The location of the api document is loaded from classpath by default, but you can use file: or http: to refer to resources to load from file or http url.		String
camel.rest.producer-component	Sets the name of the Camel component to use as the REST producer.		String
camel.rest.scheme	The scheme to use for exposing the REST service. Usually http or https is supported. The default value is http.		String
camel.rest.skip-binding-on-error-code	Whether to skip binding on output if there is a custom HTTP error code header. This allows to build custom error messages that do not bind to json / xml etc, as success messages otherwise will do.	false	Boolean
camel.rest.use-x-forward-headers	Whether to use X-Forward headers to set host etc. for OpenApi. This may be needed in special cases involving reverse-proxy and networking going from HTTP to HTTPS etc. Then the proxy can send X-Forward headers (X-Forwarded-Proto) that influences the host names in the OpenAPI schema that camel-openapi-java generates from Rest DSL routes.	false	Boolean
camel.rest.xml-data-format	Name of specific XML data format to use. By default jaxb will be used. Important: This option is only for setting a custom name of the data format, not to refer to an existing data format instance.		String

Name

Description

Default

Type

camel.cloud.consul.service-discovery.acl-token

Sets the ACL token to be used with Consul.

String

camel.cloud.consul.service-discovery.block-seconds

The seconds to wait for a watch event, default 10 seconds.

Integer

camel.cloud.consul.service-discovery.configurations

Define additional configuration definitions.

Map

camel.cloud.consul.service-discovery.connect-timeout-millis

Connect timeout for OkHttpClient.

Long

camel.cloud.consul.service-discovery.datacenter

The data center.

String

camel.cloud.consul.service-discovery.enabled

Enable the component.

true

Boolean

camel.cloud.consul.service-discovery.password

Sets the password to be used for basic authentication.

String

camel.cloud.consul.service-discovery.properties

Set client properties to use. These properties are specific to what service call implementation are in use. For example if using a different one, then the client properties are defined according to the specific service in use.

Map

camel.cloud.consul.service-discovery.read-timeout-millis

Read timeout for OkHttpClient.

Long

camel.cloud.consul.service-discovery.url

The Consul agent URL.

String

camel.cloud.consul.service-discovery.user-name

Sets the username to be used for basic authentication.

String

camel.cloud.consul.service-discovery.write-timeout-millis

Write timeout for OkHttpClient.

Long

camel.cloud.dns.service-discovery.configurations

Define additional configuration definitions.

Map

camel.cloud.dns.service-discovery.domain

The domain name;.

String

camel.cloud.dns.service-discovery.enabled

Enable the component.

true

Boolean

camel.cloud.dns.service-discovery.properties

Map

camel.cloud.dns.service-discovery.proto

The transport protocol of the desired service.

_tcp

String

camel.cloud.kubernetes.service-discovery.api-version

Sets the API version when using client lookup.

String

camel.cloud.kubernetes.service-discovery.ca-cert-data

Sets the Certificate Authority data when using client lookup.

String

camel.cloud.kubernetes.service-discovery.ca-cert-file

Sets the Certificate Authority data that are loaded from the file when using client lookup.

String

camel.cloud.kubernetes.service-discovery.client-cert-data

Sets the Client Certificate data when using client lookup.

String

camel.cloud.kubernetes.service-discovery.client-cert-file

Sets the Client Certificate data that are loaded from the file when using client lookup.

String

camel.cloud.kubernetes.service-discovery.client-key-algo

Sets the Client Keystore algorithm, such as RSA when using client lookup.

String

camel.cloud.kubernetes.service-discovery.client-key-data

Sets the Client Keystore data when using client lookup.

String

camel.cloud.kubernetes.service-discovery.client-key-file

Sets the Client Keystore data that are loaded from the file when using client lookup.

String

camel.cloud.kubernetes.service-discovery.client-key-passphrase

Sets the Client Keystore passphrase when using client lookup.

String

camel.cloud.kubernetes.service-discovery.configurations

Define additional configuration definitions.

Map

camel.cloud.kubernetes.service-discovery.dns-domain

Sets the DNS domain to use for DNS lookup.

String

camel.cloud.kubernetes.service-discovery.enabled

Enable the component.

true

Boolean

camel.cloud.kubernetes.service-discovery.lookup

How to perform service lookup. Possible values: client, dns, environment. When using client, then the client queries the kubernetes master to obtain a list of active pods that provides the service, and then random (or round robin) select a pod. When using dns the service name is resolved as name.namespace.svc.dnsDomain. When using dnssrv the service name is resolved with SRV query for .…svc… When using environment then environment variables are used to lookup the service. By default environment is used.

environment

String

camel.cloud.kubernetes.service-discovery.master-url

Sets the URL to the master when using client lookup.

String

camel.cloud.kubernetes.service-discovery.namespace

Sets the namespace to use. Will by default use namespace from the ENV variable KUBERNETES_MASTER.

String

camel.cloud.kubernetes.service-discovery.oauth-token

Sets the OAUTH token for authentication (instead of username/password) when using client lookup.

String

camel.cloud.kubernetes.service-discovery.password

Sets the password for authentication when using client lookup.

String

camel.cloud.kubernetes.service-discovery.port-name

Sets the Port Name to use for DNS/DNSSRV lookup.

String

camel.cloud.kubernetes.service-discovery.port-protocol

Sets the Port Protocol to use for DNS/DNSSRV lookup.

String

camel.cloud.kubernetes.service-discovery.properties

Map

camel.cloud.kubernetes.service-discovery.trust-certs

Sets whether to turn on trust certificate check when using client lookup.

false

Boolean

camel.cloud.kubernetes.service-discovery.username

Sets the username for authentication when using client lookup.

String

camel.language.constant.enabled

Whether to enable auto configuration of the constant language. This is enabled by default.

Boolean

camel.language.constant.trim

Whether to trim the value to remove leading and trailing whitespaces and line breaks.

true

Boolean

camel.language.csimple.enabled

Whether to enable auto configuration of the csimple language. This is enabled by default.

Boolean

camel.language.csimple.trim

Whether to trim the value to remove leading and trailing whitespaces and line breaks.

true

Boolean

camel.language.exchange-property.enabled

Whether to enable auto configuration of the exchangeProperty language. This is enabled by default.

Boolean

camel.language.exchange-property.trim

Whether to trim the value to remove leading and trailing whitespaces and line breaks.

true

Boolean

camel.language.file.enabled

Whether to enable auto configuration of the file language. This is enabled by default.

Boolean

camel.language.file.trim

Whether to trim the value to remove leading and trailing whitespaces and line breaks.

true

Boolean

camel.language.header.enabled

Whether to enable auto configuration of the header language. This is enabled by default.

Boolean

camel.language.header.trim

Whether to trim the value to remove leading and trailing whitespaces and line breaks.

true

Boolean

camel.language.ref.enabled

Whether to enable auto configuration of the ref language. This is enabled by default.

Boolean

camel.language.ref.trim

Whether to trim the value to remove leading and trailing whitespaces and line breaks.

true

Boolean

camel.language.simple.enabled

Whether to enable auto configuration of the simple language. This is enabled by default.

Boolean

camel.language.simple.trim

Whether to trim the value to remove leading and trailing whitespaces and line breaks.

true

Boolean

camel.language.tokenize.enabled

Whether to enable auto configuration of the tokenize language. This is enabled by default.

Boolean

camel.language.tokenize.group-delimiter

Sets the delimiter to use when grouping. If this has not been set then token will be used as the delimiter.

String

camel.language.tokenize.source

Source to use, instead of message body. You can prefix with variable:, header:, or property: to specify kind of source. Otherwise, the source is assumed to be a variable. Use empty or null to use default source, which is the message body.

String

camel.language.tokenize.trim

Whether to trim the value to remove leading and trailing whitespaces and line breaks.

true

Boolean

camel.language.variable.enabled

Whether to enable auto configuration of the variable language. This is enabled by default.

Boolean

camel.language.variable.trim

Whether to trim the value to remove leading and trailing whitespaces and line breaks.

true

Boolean

camel.resilience4j.automatic-transition-from-open-to-half-open-enabled

Enables automatic transition from OPEN to HALF_OPEN state once the waitDurationInOpenState has passed.

false

Boolean

camel.resilience4j.bulkhead-enabled

Whether bulkhead is enabled or not on the circuit breaker. Default is false.

false

Boolean

camel.resilience4j.bulkhead-max-concurrent-calls

Configures the max amount of concurrent calls the bulkhead will support.

Integer

camel.resilience4j.bulkhead-max-wait-duration

Configures a maximum amount of time which the calling thread will wait to enter the bulkhead. If bulkhead has space available, entry is guaranteed and immediate. If bulkhead is full, calling threads will contest for space, if it becomes available. maxWaitDuration can be set to 0. Note: for threads running on an event-loop or equivalent (rx computation pool, etc), setting maxWaitDuration to 0 is highly recommended. Blocking an event-loop thread will most likely have a negative effect on application throughput.

Integer

camel.resilience4j.circuit-breaker

Refers to an existing io.github.resilience4j.circuitbreaker.CircuitBreaker instance to lookup and use from the registry. When using this, then any other circuit breaker options are not in use.

String

camel.resilience4j.config

Refers to an existing io.github.resilience4j.circuitbreaker.CircuitBreakerConfig instance to lookup and use from the registry.

String

camel.resilience4j.configurations

Define additional configuration definitions.

Map

camel.resilience4j.enabled

Enable the component.

true

Boolean

camel.resilience4j.failure-rate-threshold

Configures the failure rate threshold in percentage. If the failure rate is equal or greater than the threshold the CircuitBreaker transitions to open and starts short-circuiting calls. The threshold must be greater than 0 and not greater than 100. Default value is 50 percentage.

Float

camel.resilience4j.ignore-exception

Configure a list of exceptions that are ignored and neither count as a failure nor success. Any exception matching or inheriting from one of the list will not count as a failure nor success, even if the exceptions is part of recordExceptions.

List

camel.resilience4j.minimum-number-of-calls

Configures the minimum number of calls which are required (per sliding window period) before the CircuitBreaker can calculate the error rate. For example, if minimumNumberOfCalls is 10, then at least 10 calls must be recorded, before the failure rate can be calculated. If only 9 calls have been recorded the CircuitBreaker will not transition to open even if all 9 calls have failed. Default minimumNumberOfCalls is 100.

100

Integer

camel.resilience4j.permitted-number-of-calls-in-half-open-state

Configures the number of permitted calls when the CircuitBreaker is half open. The size must be greater than 0. Default size is 10.

Integer

camel.resilience4j.record-exception

Configure a list of exceptions that are recorded as a failure and thus increase the failure rate. Any exception matching or inheriting from one of the list counts as a failure, unless explicitly ignored via ignoreExceptions.

List

camel.resilience4j.sliding-window-size

Configures the size of the sliding window which is used to record the outcome of calls when the CircuitBreaker is closed. slidingWindowSize configures the size of the sliding window. Sliding window can either be count-based or time-based. If slidingWindowType is COUNT_BASED, the last slidingWindowSize calls are recorded and aggregated. If slidingWindowType is TIME_BASED, the calls of the last slidingWindowSize seconds are recorded and aggregated. The slidingWindowSize must be greater than 0. The minimumNumberOfCalls must be greater than 0. If the slidingWindowType is COUNT_BASED, the minimumNumberOfCalls cannot be greater than slidingWindowSize . If the slidingWindowType is TIME_BASED, you can pick whatever you want. Default slidingWindowSize is 100.

100

Integer

camel.resilience4j.sliding-window-type

Configures the type of the sliding window which is used to record the outcome of calls when the CircuitBreaker is closed. Sliding window can either be count-based or time-based. If slidingWindowType is COUNT_BASED, the last slidingWindowSize calls are recorded and aggregated. If slidingWindowType is TIME_BASED, the calls of the last slidingWindowSize seconds are recorded and aggregated. Default slidingWindowType is COUNT_BASED.

COUNT_BASED

String

camel.resilience4j.slow-call-duration-threshold

Configures the duration threshold (seconds) above which calls are considered as slow and increase the slow calls percentage. Default value is 60 seconds.

Integer

camel.resilience4j.slow-call-rate-threshold

Configures a threshold in percentage. The CircuitBreaker considers a call as slow when the call duration is greater than slowCallDurationThreshold Duration. When the percentage of slow calls is equal or greater the threshold, the CircuitBreaker transitions to open and starts short-circuiting calls. The threshold must be greater than 0 and not greater than 100. Default value is 100 percentage which means that all recorded calls must be slower than slowCallDurationThreshold.

Float

camel.resilience4j.throw-exception-when-half-open-or-open-state

Whether to throw io.github.resilience4j.circuitbreaker.CallNotPermittedException when the call is rejected due circuit breaker is half open or open.

false

Boolean

camel.resilience4j.timeout-cancel-running-future

Configures whether cancel is called on the running future. Defaults to true.

true

Boolean

camel.resilience4j.timeout-duration

Configures the thread execution timeout. Default value is 1 second.

1000

Integer

camel.resilience4j.timeout-enabled

Whether timeout is enabled or not on the circuit breaker. Default is false.

false

Boolean

camel.resilience4j.timeout-executor-service

References to a custom thread pool to use when timeout is enabled (uses ForkJoinPool#commonPool() by default).

ExecutorService

camel.resilience4j.wait-duration-in-open-state

Configures the wait duration (in seconds) which specifies how long the CircuitBreaker should stay open, before it switches to half open. Default value is 60 seconds.

Integer

camel.resilience4j.writable-stack-trace-enabled

Enables writable stack traces. When set to false, Exception.getStackTrace returns a zero length array. This may be used to reduce log spam when the circuit breaker is open as the cause of the exceptions is already known (the circuit breaker is short-circuiting calls).

true

Boolean

camel.rest.api-component

The name of the Camel component to use as the REST API. If no API Component has been explicit configured, then Camel will lookup if there is a Camel component responsible for servicing and generating the REST API documentation, or if a org.apache.camel.spi.RestApiProcessorFactory is registered in the registry. If either one is found, then that is being used.

String

camel.rest.api-context-path

Sets a leading context-path the REST API will be using. This can be used when using components such as camel-servlet where the deployed web application is deployed using a context-path.

String

camel.rest.api-context-route-id

Sets the route id to use for the route that services the REST API. The route will by default use an auto assigned route id.

String

camel.rest.api-host

To use a specific hostname for the API documentation (such as swagger or openapi) This can be used to override the generated host with this configured hostname.

String

camel.rest.api-property

Allows to configure as many additional properties for the api documentation. For example set property api.title to my cool stuff.

Map

camel.rest.api-vendor-extension

Whether vendor extension is enabled in the Rest APIs. If enabled then Camel will include additional information as vendor extension (eg keys starting with x-) such as route ids, class names etc. Not all 3rd party API gateways and tools supports vendor-extensions when importing your API docs.

false

Boolean

camel.rest.binding-mode

Sets the binding mode to use. The default value is off.

RestBindingMode

camel.rest.binding-package-scan

Package name to use as base (offset) for classpath scanning of POJO classes are located when using binding mode is enabled for JSon or XML. Multiple package names can be separated by comma.

String

camel.rest.client-request-validation

Whether to enable validation of the client request to check: 1) Content-Type header matches what the Rest DSL consumes; returns HTTP Status 415 if validation error. 2) Accept header matches what the Rest DSL produces; returns HTTP Status 406 if validation error. 3) Missing required data (query parameters, HTTP headers, body); returns HTTP Status 400 if validation error. 4) Parsing error of the message body (JSon, XML or Auto binding mode must be enabled); returns HTTP Status 400 if validation error.

false

Boolean

camel.rest.component

The Camel Rest component to use for the REST transport (consumer), such as netty-http, jetty, servlet, undertow. If no component has been explicit configured, then Camel will lookup if there is a Camel component that integrates with the Rest DSL, or if a org.apache.camel.spi.RestConsumerFactory is registered in the registry. If either one is found, then that is being used.

String

camel.rest.component-property

Allows to configure as many additional properties for the rest component in use.

Map

camel.rest.consumer-property

Allows to configure as many additional properties for the rest consumer in use.

Map

camel.rest.context-path

Sets a leading context-path the REST services will be using. This can be used when using components such as camel-servlet where the deployed web application is deployed using a context-path. Or for components such as camel-jetty or camel-netty-http that includes a HTTP server.

String

camel.rest.cors-headers

Allows to configure custom CORS headers.

Map

camel.rest.data-format-property

Allows to configure as many additional properties for the data formats in use. For example set property prettyPrint to true to have json outputted in pretty mode. The properties can be prefixed to denote the option is only for either JSON or XML and for either the IN or the OUT. The prefixes are: json.in. json.out. xml.in. xml.out. For example a key with value xml.out.mustBeJAXBElement is only for the XML data format for the outgoing. A key without a prefix is a common key for all situations.

Map

camel.rest.enable-cors

Whether to enable CORS headers in the HTTP response. The default value is false.

false

Boolean

camel.rest.enable-no-content-response

Whether to return HTTP 204 with an empty body when a response contains an empty JSON object or XML root object. The default value is false.

false

Boolean

camel.rest.endpoint-property

Allows to configure as many additional properties for the rest endpoint in use.

Map

camel.rest.host

The hostname to use for exposing the REST service.

String

camel.rest.host-name-resolver

If no hostname has been explicit configured, then this resolver is used to compute the hostname the REST service will be using.

RestHostNameResolver

camel.rest.inline-routes

Inline routes in rest-dsl which are linked using direct endpoints. Each service in Rest DSL is an individual route, meaning that you would have at least two routes per service (rest-dsl, and the route linked from rest-dsl). By inlining (default) allows Camel to optimize and inline this as a single route, however this requires to use direct endpoints, which must be unique per service. If a route is not using direct endpoint then the rest-dsl is not inlined, and will become an individual route. This option is default true.

true

Boolean

camel.rest.json-data-format

Name of specific json data format to use. By default jackson will be used. Important: This option is only for setting a custom name of the data format, not to refer to an existing data format instance.

String

camel.rest.port

The port number to use for exposing the REST service. Notice if you use servlet component then the port number configured here does not apply, as the port number in use is the actual port number the servlet component is using. eg if using Apache Tomcat its the tomcat http port, if using Apache Karaf its the HTTP service in Karaf that uses port 8181 by default etc. Though in those situations setting the port number here, allows tooling and JMX to know the port number, so its recommended to set the port number to the number that the servlet engine uses.

String

camel.rest.producer-api-doc

Sets the location of the api document the REST producer will use to validate the REST uri and query parameters are valid accordingly to the api document. The location of the api document is loaded from classpath by default, but you can use file: or http: to refer to resources to load from file or http url.

String

camel.rest.producer-component

Sets the name of the Camel component to use as the REST producer.

String

camel.rest.scheme

The scheme to use for exposing the REST service. Usually http or https is supported. The default value is http.

String

camel.rest.skip-binding-on-error-code

Whether to skip binding on output if there is a custom HTTP error code header. This allows to build custom error messages that do not bind to json / xml etc, as success messages otherwise will do.

false

Boolean

camel.rest.use-x-forward-headers

Whether to use X-Forward headers to set host etc. for OpenApi. This may be needed in special cases involving reverse-proxy and networking going from HTTP to HTTPS etc. Then the proxy can send X-Forward headers (X-Forwarded-Proto) that influences the host names in the OpenAPI schema that camel-openapi-java generates from Rest DSL routes.

false

Boolean

camel.rest.xml-data-format

Name of specific XML data format to use. By default jaxb will be used. Important: This option is only for setting a custom name of the data format, not to refer to an existing data format instance.

String

CSimple

Different between CSimple and Simple

Additional CSimple functions

Compilation

Using camel-csimple-maven-plugin

Using camel-csimple-joor

CSimple Language options

Limitations

Auto imports

Configuration file

See Also

Spring Boot Auto-Configuration