Resteasy

Since Camel 3.4

Both producer and consumer are supported

The resteasy: component provides HTTP based endpoints for consuming HTTP requests that arrive at a HTTP endpoint that is bound to a published Servlet.

Maven users will need to add the following dependency to their pom.xml for this component:

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

URI format

resteasy://relative_path[?options]

You can append query options to the URI in the following format: ?option=value&option=value&…​

Options

The Resteasy component supports 22 options, which are listed below.

Name Description Default Type

httpRegistry (common)

Sets httpRegistry which can be externalized to be used by camel

HttpRegistry

proxyConsumersClasses (common)

Sets the proxy class for consumer enpoints

String

bridgeErrorHandler (consumer)

Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions occurred while the consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored.

false

boolean

cookieStore (producer)

To use a custom org.apache.http.client.CookieStore. By default the org.apache.http.impl.client.BasicCookieStore is used which is an in-memory only cookie store. Notice if bridgeEndpoint=true then the cookie store is forced to be a noop cookie store as cookie shouldn’t be stored as we are just bridging (eg acting as a proxy).

CookieStore

lazyStartProducer (producer)

Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel’s routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing.

false

boolean

allowJavaSerializedObject (advanced)

Whether to allow java serialization when a request uses context-type=application/x-java-serialized-object. This is by default turned off. If you enable this then be aware that Java will deserialize the incoming data from the request to Java and that can be a potential security risk.

false

boolean

basicPropertyBinding (advanced)

Whether the component should use basic property binding (Camel 2.x) or the newer property binding with additional capabilities

false

boolean

clientConnectionManager (advanced)

To use a custom and shared HttpClientConnectionManager to manage connections. If this has been configured then this is always used for all endpoints created by this component.

HttpClientConnectionManager

connectionsPerRoute (advanced)

The maximum number of connections per route.

20

int

connectionTimeToLive (advanced)

The time for connection to live, the time unit is millisecond, the default value is always keep alive.

long

httpBinding (advanced)

To use a custom HttpBinding to control the mapping between Camel message and HttpClient.

HttpBinding

httpClientConfigurer (advanced)

To use the custom HttpClientConfigurer to perform configuration of the HttpClient that will be used.

HttpClientConfigurer

httpConfiguration (advanced)

To use the shared HttpConfiguration as base configuration.

HttpConfiguration

httpContext (advanced)

To use a custom org.apache.http.protocol.HttpContext when executing requests.

HttpContext

maxTotalConnections (advanced)

The maximum number of connections.

200

int

headerFilterStrategy (filter)

To use a custom org.apache.camel.spi.HeaderFilterStrategy to filter header to and from Camel message.

HeaderFilterStrategy

sslContextParameters (security)

To configure security using SSLContextParameters. Important: Only one instance of org.apache.camel.support.jsse.SSLContextParameters is supported per HttpComponent. If you need to use 2 or more different instances, you need to define a new HttpComponent per instance you need.

SSLContextParameters

useGlobalSslContextParameters (security)

Enable usage of global SSL context parameters.

false

boolean

x509HostnameVerifier (security)

To use a custom X509HostnameVerifier such as DefaultHostnameVerifier or NoopHostnameVerifier.

HostnameVerifier

connectionRequestTimeout (timeout)

The timeout in milliseconds used when requesting a connection from the connection manager. A timeout value of zero is interpreted as an infinite timeout. A timeout value of zero is interpreted as an infinite timeout. A negative value is interpreted as undefined (system default).

-1

int

connectTimeout (timeout)

Determines the timeout in milliseconds until a connection is established. A timeout value of zero is interpreted as an infinite timeout. A timeout value of zero is interpreted as an infinite timeout. A negative value is interpreted as undefined (system default).

-1

int

socketTimeout (timeout)

Defines the socket timeout in milliseconds, which is the timeout for waiting for data or, put differently, a maximum period inactivity between two consecutive data packets). A timeout value of zero is interpreted as an infinite timeout. A negative value is interpreted as undefined (system default).

-1

int

The Resteasy endpoint is configured using URI syntax:

resteasy:httpUri

with the following path and query parameters:

Path Parameters (1 parameters):

Name Description Default Type

httpUri

Required The url of the HTTP endpoint to call.

URI

Query Parameters (73 parameters):

Name Description Default Type

chunked (common)

If this option is false the Servlet will disable the HTTP streaming and set the content-length header on the response

true

boolean

disableStreamCache (common)

Determines whether or not the raw input stream from Servlet is cached or not (Camel will read the stream into a in memory/overflow to file, Stream caching) cache. By default Camel will cache the Servlet input stream to support reading it multiple times to ensure it Camel can retrieve all data from the stream. However you can set this option to true when you for example need to access the raw stream, such as streaming it directly to a file or other persistent store. DefaultHttpBinding will copy the request input stream into a stream cache and put it into message body if this option is false to support reading the stream multiple times. If you use Servlet to bridge/proxy an endpoint then consider enabling this option to improve performance, in case you do not need to read the message payload multiple times. The http producer will by default cache the response body stream. If setting this option to true, then the producers will not cache the response body stream but use the response stream as-is as the message body.

false

boolean

restEasyHttpBindingRef (common)

Sets the restEasyHttpBinding if you have a customised one registered in the context

ResteasyHttpBinding

resteasyMethod (common)

Sets the resteasy method to process the request

GET

String

servletName (common)

Sets the servlet name

String

transferException (common)

If enabled and an Exchange failed processing on the consumer side, and if the caused Exception was send back serialized in the response as a application/x-java-serialized-object content type. On the producer side the exception will be deserialized and thrown as is, instead of the HttpOperationFailedException. The caused exception is required to be serialized. This is by default turned off. If you enable this then be aware that Java will deserialize the incoming data from the request to Java and that can be a potential security risk.

false

boolean

httpBinding (common)

To use a custom HttpBinding to control the mapping between Camel message and HttpClient.

HttpBinding

async (consumer)

Configure the consumer to work in async mode

false

boolean

bridgeErrorHandler (consumer)

Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions occurred while the consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored.

false

boolean

httpMethodRestrict (consumer)

Used to only allow consuming if the HttpMethod matches, such as GET/POST/PUT etc. Multiple methods can be specified separated by comma.

String

matchOnUriPrefix (consumer)

Whether or not the consumer should try to find a target consumer by matching the URI prefix if no exact match is found.

false

boolean

muteException (consumer)

If enabled and an Exchange failed processing on the consumer side the response’s body won’t contain the exception’s stack trace.

false

boolean

responseBufferSize (consumer)

To use a custom buffer size on the javax.servlet.ServletResponse.

Integer

eagerCheckContentAvailable (consumer)

Whether to eager check whether the HTTP requests has content if the content-length header is 0 or not present. This can be turned on in case HTTP clients do not send streamed data.

false

boolean

exceptionHandler (consumer)

To let the consumer use a custom ExceptionHandler. Notice if the option bridgeErrorHandler is enabled then this option is not in use. By default the consumer will deal with exceptions, that will be logged at WARN or ERROR level and ignored.

ExceptionHandler

exchangePattern (consumer)

Sets the exchange pattern when the consumer creates an exchange. The value can be one of: InOnly, InOut, InOptionalOut

ExchangePattern

optionsEnabled (consumer)

Specifies whether to enable HTTP OPTIONS for this Servlet consumer. By default OPTIONS is turned off.

false

boolean

traceEnabled (consumer)

Specifies whether to enable HTTP TRACE for this Servlet consumer. By default TRACE is turned off.

false

boolean

bridgeEndpoint (producer)

If the option is true, HttpProducer will ignore the Exchange.HTTP_URI header, and use the endpoint’s URI for request. You may also set the option throwExceptionOnFailure to be false to let the HttpProducer send all the fault response back.

false

boolean

clearExpiredCookies (producer)

Whether to clear expired cookies before sending the HTTP request. This ensures the cookies store does not keep growing by adding new cookies which is newer removed when they are expired.

true

boolean

connectionClose (producer)

Specifies whether a Connection Close header must be added to HTTP Request. By default connectionClose is false.

false

boolean

copyHeaders (producer)

If this option is true then IN exchange headers will be copied to OUT exchange headers according to copy strategy. Setting this to false, allows to only include the headers from the HTTP response (not propagating IN headers).

true

boolean

customHostHeader (producer)

To use custom host header for producer. When not set in query will be ignored. When set will override host header derived from url.

String

httpMethod (producer)

Configure the HTTP method to use. The HttpMethod header cannot override this option if set. The value can be one of: GET, POST, PUT, DELETE, HEAD, OPTIONS, TRACE, PATCH

HttpMethods

ignoreResponseBody (producer)

If this option is true, The http producer won’t read response body and cache the input stream

false

boolean

lazyStartProducer (producer)

Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel’s routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing.

false

boolean

preserveHostHeader (producer)

If the option is true, HttpProducer will set the Host header to the value contained in the current exchange Host header, useful in reverse proxy applications where you want the Host header received by the downstream server to reflect the URL called by the upstream client, this allows applications which use the Host header to generate accurate URL’s for a proxied service

false

boolean

throwExceptionOnFailure (producer)

Option to disable throwing the HttpOperationFailedException in case of failed responses from the remote server. This allows you to get all responses regardless of the HTTP status code.

true

boolean

cookieHandler (producer)

Configure a cookie handler to maintain a HTTP session

CookieHandler

cookieStore (producer)

To use a custom CookieStore. By default the BasicCookieStore is used which is an in-memory only cookie store. Notice if bridgeEndpoint=true then the cookie store is forced to be a noop cookie store as cookie shouldn’t be stored as we are just bridging (eg acting as a proxy). If a cookieHandler is set then the cookie store is also forced to be a noop cookie store as cookie handling is then performed by the cookieHandler.

CookieStore

deleteWithBody (producer)

Whether the HTTP DELETE should include the message body or not. By default HTTP DELETE do not include any HTTP body. However in some rare cases users may need to be able to include the message body.

false

boolean

getWithBody (producer)

Whether the HTTP GET should include the message body or not. By default HTTP GET do not include any HTTP body. However in some rare cases users may need to be able to include the message body.

false

boolean

okStatusCodeRange (producer)

The status codes which are considered a success response. The values are inclusive. Multiple ranges can be defined, separated by comma, e.g. 200-204,209,301-304. Each range must be a single number or from-to with the dash included.

200-299

String

basicPropertyBinding (advanced)

Whether the endpoint should use basic property binding (Camel 2.x) or the newer property binding with additional capabilities

false

boolean

clientBuilder (advanced)

Provide access to the http client request parameters used on new RequestConfig instances used by producers or consumers of this endpoint.

HttpClientBuilder

clientConnectionManager (advanced)

To use a custom HttpClientConnectionManager to manage connections

HttpClientConnectionManager

connectionsPerRoute (advanced)

The maximum number of connections per route.

20

int

headerFilterStrategy (advanced)

To use a custom HeaderFilterStrategy to filter header to and from Camel message.

HeaderFilterStrategy

httpClient (advanced)

Sets a custom HttpClient to be used by the producer

HttpClient

httpClientConfigurer (advanced)

Register a custom configuration strategy for new HttpClient instances created by producers or consumers such as to configure authentication mechanisms etc.

HttpClientConfigurer

httpClientOptions (advanced)

To configure the HttpClient using the key/values from the Map.

Map

httpContext (advanced)

To use a custom HttpContext instance

HttpContext

mapHttpMessageBody (advanced)

If this option is true then IN exchange Body of the exchange will be mapped to HTTP body. Setting this to false will avoid the HTTP mapping.

true

boolean

mapHttpMessageFormUrlEncoded Body (advanced)

If this option is true then IN exchange Form Encoded body of the exchange will be mapped to HTTP. Setting this to false will avoid the HTTP Form Encoded body mapping.

true

boolean

mapHttpMessageHeaders (advanced)

If this option is true then IN exchange Headers of the exchange will be mapped to HTTP headers. Setting this to false will avoid the HTTP Headers mapping.

true

boolean

maxTotalConnections (advanced)

The maximum number of connections.

200

int

setHttpResponseDuring Processing (advanced)

Sets the flag to use the endpoint where you can either populate camel exchange from servlet response or use request itself which may be thought as if it is a proxy.

Boolean

skipServletProcessing (advanced)

Sets the flag to use skip servlet processing and let camel take over processing

Boolean

synchronous (advanced)

Sets whether synchronous processing should be strictly used, or Camel is allowed to use asynchronous processing (if supported).

false

boolean

useSystemProperties (advanced)

To use System Properties as fallback for configuration

false

boolean

proxyAuthDomain (proxy)

Proxy authentication domain to use with NTML

String

proxyAuthHost (proxy)

Proxy authentication host

String

proxyAuthMethod (proxy)

Proxy authentication method to use. The value can be one of: Basic, Digest, NTLM

String

proxyAuthPassword (proxy)

Proxy authentication password

String

proxyAuthPort (proxy)

Proxy authentication port

int

proxyAuthScheme (proxy)

Proxy authentication scheme to use. The value can be one of: http, https

String

proxyAuthUsername (proxy)

Proxy authentication username

String

proxyClientClass (proxy)

Sets the resteasy proxyClientClass

String

proxyHost (proxy)

Proxy hostname to use

String

proxyMethod (proxy)

Sets the proxy method defined in an interface

String

proxyPort (proxy)

Proxy port to use

int

authDomain (security)

Authentication domain to use with NTML

String

authenticationPreemptive (security)

If this option is true, camel-http sends preemptive basic authentication to the server.

false

boolean

authHost (security)

Authentication host to use with NTML

String

authMethod (security)

Authentication methods allowed to use as a comma separated list of values Basic, Digest or NTLM.

String

authMethodPriority (security)

Which authentication method to prioritize to use, either as Basic, Digest or NTLM. The value can be one of: Basic, Digest, NTLM

String

authPassword (security)

Authentication password

String

authUsername (security)

Authentication username

String

basicAuth (security)

Sets the flag to basicAuth on endpoint

Boolean

password (security)

Sets the password

String

sslContextParameters (security)

To configure security using SSLContextParameters. Important: Only one instance of org.apache.camel.util.jsse.SSLContextParameters is supported per HttpComponent. If you need to use 2 or more different instances, you need to define a new HttpComponent per instance you need.

SSLContextParameters

username (security)

Sets the username

String

x509HostnameVerifier (security)

To use a custom X509HostnameVerifier such as DefaultHostnameVerifier or NoopHostnameVerifier

HostnameVerifier

Usage

Consumer endpoints are similar to endpoints generated by the Servlet component. Therefore, it should be used only as input into your Camel routes. To issue HTTP requests against other HTTP endpoints, use the HTTP Component.

Putting Camel JARs in the app server boot classpath

Refer same section of Servlet Component.

Sample

As a basic consumer with Spring example, first, you need to publish the servlet using the Web.xml file to publish

Notice that below two listeners are registered when application server is initialized. The org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap class is a ServletContextListener that configures an instance of an ResteasyProviderFactory and Registry. You can obtain instances of a ResteasyProviderFactory and Registry from the ServletContext attributes org.jboss.resteasy.spi.ResteasyProviderFactory and org.jboss.resteasy.spi.Registry. From these instances you can programmatically interact with RESTEasy registration interfaces. Please note that the SpringContextLoaderListener must be declared after ResteasyBootstrap as it uses ServletContext attributes initialized by it. For further details please refer to https://docs.jboss.org/resteasy/docs/4.5.3.Final/userguide/html_single/index.html#RESTEasy_Spring_Integration

<web-app>
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>WEB-INF/applicationContext.xml</param-value>
    </context-param>
    <listener>
        <listener-class>org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap</listener-class>
    </listener>

    <listener>
        <listener-class>org.jboss.resteasy.plugins.spring.SpringContextLoaderListener</listener-class>
    </listener>

    <servlet>
        <servlet-name>resteasy-camel-servlet</servlet-name>
        <servlet-class>org.apache.camel.component.resteasy.servlet.ResteasyCamelServlet</servlet-class>
    </servlet>

    <servlet-mapping>
        <servlet-name>resteasy-camel-servlet</servlet-name>
        <url-pattern>/*</url-pattern>
    </servlet-mapping>

</web-app>

Then you can define your route as follows:

<context:component-scan base-package="org.apache.camel.component.resteasy.test">
    <context:include-filter type="annotation" expression="javax.ws.rs.Path"/>
</context:component-scan>

    ........

<camel:camelContext>

    <camel:route>
        <camel:from uri="resteasy:/customer/getAll?servletName=resteasy-camel-servlet"/>
        <camel:to uri="file://target/test/consumerTest?fileName=all.txt"/>
    </camel:route>

 </camel:camelContext>

Notice that component-scan is important to load resteasy servlet properly into container’s runtime.

Spring Boot Auto-Configuration

When using resteasy 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-resteasy-starter</artifactId>
  <version>x.x.x</version>
  <!-- use the same version as your Camel core version -->
</dependency>

The component supports 7 options, which are listed below.

Name Description Default Type

camel.component.resteasy.allow-java-serialized-object

Whether to allow java serialization when a request uses context-type=application/x-java-serialized-object. This is by default turned off. If you enable this then be aware that Java will deserialize the incoming data from the request to Java and that can be a potential security risk.

false

Boolean

camel.component.resteasy.bridge-error-handler

Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions occurred while the consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored.

false

Boolean

camel.component.resteasy.enabled

Whether to enable auto configuration of the resteasy component. This is enabled by default.

Boolean

camel.component.resteasy.header-filter-strategy

To use a custom org.apache.camel.spi.HeaderFilterStrategy to filter header to and from Camel message. The option is a org.apache.camel.spi.HeaderFilterStrategy type.

String

camel.component.resteasy.lazy-start-producer

Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel’s routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing.

false

Boolean

camel.component.resteasy.proxy-consumers-classes

Proxy classes for consumer endpoints. Multiple classes can be separated by comma.

String

camel.component.resteasy.basic-property-binding

Deprecated Whether the component should use basic property binding (Camel 2.x) or the newer property binding with additional capabilities

false

Boolean