Bean Component

The bean: component binds beans to Camel message exchanges.

URI format

Where beanID can be any string which is used to look up the bean in the Registry

Options

Name

Type

Default

Description

method

String

null

The method name from the bean that will be invoked. If not provided, Camel will try to determine the method itself. In case of ambiguity an exception will be thrown. See Bean Binding for more details. From Camel 2.8 onwards you can specify type qualifiers to pin-point the exact method to use for overloaded methods. From Camel 2.9 onwards you can specify parameter values directly in the method syntax. See more details at Bean Binding.

cache

boolean

false

If enabled, Camel will cache the result of the first Registry look-up. Cache can be enabled if the bean in the Registry is defined as a singleton scope.

multiParameterArray

boolean

false

How to treat the parameters which are passed from the message body; if it is true, the In message body should be an array of parameters.

You can append query options to the URI in the following format, ?option=value&option=value&...

Using

The object instance that is used to consume messages must be explicitly registered with the Registry. For example, if you are using Spring you must define the bean in the Spring configuration, spring.xml; or if you don't use Spring, by registering the bean in JNDI.

Once an endpoint has been registered, you can build Camel routes that use it to process exchanges.

A bean: endpoint cannot be defined as the input to the route; i.e. you cannot consume from it, you can only route from some inbound message Endpoint to the bean endpoint as output. So consider using a direct: or queue: endpoint as the input.

You can use the createProxy() methods on ProxyHelper to create a proxy that will generate BeanExchanges and send them to any endpoint:

And the same route using Spring DSL:

Bean as endpoint

Camel also supports invoking Bean as an Endpoint. In the route below:

What happens is that when the exchange is routed to the myBean Camel will use the Bean Binding to invoke the bean.
The source for the bean is just a plain POJO:

Camel will use Bean Binding to invoke the sayHello method, by converting the Exchange's In body to the String type and storing the output of the method on the Exchange Out body.

Java DSL bean syntax

Java DSL comes with syntactic sugar for the Bean component. Instead of specifying the bean explicitly as the endpoint (i.e. to("bean:beanName")) you can use the following syntax:

Instead of passing name of the reference to the bean (so that Camel will lookup for it in the registry), you can specify the bean itself:

Bean Binding

How bean methods to be invoked are chosen (if they are not specified explicitly through the method parameter) and how parameter values are constructed from the Message are all defined by the Bean Binding mechanism which is used throughout all of the various Bean Integration mechanisms in Camel.

See Also

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