Bean Integration

Camel supports the integration of beans and POJOs in a number of ways

Annotations

If a bean is defined in Spring XML or scanned using the Spring component scanning mechanism and a <camelContext> is used or a CamelBeanPostProcessor then we process a number of Camel annotations to do various things such as injecting resources or producing, consuming or routing messages.

The following annotations is supported and inject by Camel’s CamelBeanPostProcessor

Annotation Description

Annotation	Description
`@EndpointInject`	To inject an endpoint, see more details at POJO Producing.
`@BeanInject`	To inject a bean obtained from the Registry. See Bean Injection.
`@PropertyInject`	To inject a value using property placeholder.
`@Produce`	To inject a producer to send message to an endpoint. See POJO Producing.
`@Consume`	To inject a consumer on a method. See POJO Consuming.
`@BindToRegistry`	Used for binding a bean to the registry. If no name is specified then the bean will have its name auto computed based on the class name, field name, or method name where the annotation is configured.

@EndpointInject

To inject an endpoint, see more details at POJO Producing.

@BeanInject

To inject a bean obtained from the Registry. See Bean Injection.

@PropertyInject

To inject a value using property placeholder.

@Produce

To inject a producer to send message to an endpoint. See POJO Producing.

@Consume

To inject a consumer on a method. See POJO Consuming.

@BindToRegistry

Used for binding a bean to the registry. If no name is specified then the bean will have its name auto computed based on the class name, field name, or method name where the annotation is configured.

See more details at:

POJO Consuming to consume and possibly route messages from Camel
POJO Producing to make it easy to produce camel messages from your POJOs
@DynamicRouter Annotation for creating a Dynamic Router from a POJO method
@RecipientList Annotation for creating a Recipient List from a POJO method
@RoutingSlip Annotation for creating a Routing Slip for a POJO method
Bean Injection to inject Camel related resources into your POJOs
Using Exchange Pattern Annotations describes how the pattern annotations can be used to change the behaviour of method invocations with Spring Remoting or POJO Producing

Example

See the POJO Messaging Example for how to use the annotations for routing and messaging.

Bean Component

The Bean component allows one to invoke a particular method. Alternately the Bean component supports the creation of a proxy via ProxyHelper to a Java interface; which allows to hide sending data to the endpoint via an interface. See more at Hiding Middleware.

Spring Remoting

We support a Spring Remoting provider which uses Camel as the underlying transport mechanism. The nice thing about this approach is we can use any of the Camel transport Components to communicate between beans. It also means we can use Content Based Router and the other Enterprise Integration Patterns in between the beans; in particular we can use Message Translator to be able to convert what the on-the-wire messages look like in addition to adding various headers and so forth.

Bean binding

Whenever Camel invokes a bean method via one of the above methods (Bean component, Spring Remoting or POJO Consuming) then the Bean Binding mechanism is used to figure out what method to use (if it is not explicit) and how to bind the Message to the parameters possibly using the Parameter Binding Annotations or using a method name option.