Class

Since Camel 2.4

Only producer is supported

The Class component binds beans to Camel message exchanges. It works in the same way as the Bean component but instead of looking up beans from a Registry it creates the bean based on the class name.

URI format

class:className[?options]

Where className is the fully qualified class name to create and use as bean.

Options

The Class component supports 4 options, which are listed below.

Name	Description	Default	Type
cache (producer)	Deprecated Use singleton option instead.	true	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
scope (producer)	Scope of bean. When using singleton scope (default) the bean is created or looked up only once and reused for the lifetime of the endpoint. The bean should be thread-safe in case concurrent threads is calling the bean at the same time. When using request scope the bean is created or looked up once per request (exchange). This can be used if you want to store state on a bean while processing a request and you want to call the same bean instance multiple times while processing the request. The bean does not have to be thread-safe as the instance is only called from the same request. When using delegate scope, then the bean will be looked up or created per call. However in case of lookup then this is delegated to the bean registry such as Spring or CDI (if in use), which depends on their configuration can act as either singleton or prototype scope. so when using prototype then this depends on the delegated registry. There are 3 enums and the value can be one of: Singleton, Request, Prototype	Singleton	BeanScope
autowiredEnabled (advanced)	Whether autowiring is enabled. This is used for automatic autowiring options (the option must be marked as autowired) by looking up in the registry to find if there is a single instance of matching type, which then gets configured on the component. This can be used for automatic configuring JDBC data sources, JMS connection factories, AWS Clients, etc.	true	boolean

Name

Description

Default

Type

cache (producer)

Deprecated Use singleton option instead.

true

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

scope (producer)

Scope of bean. When using singleton scope (default) the bean is created or looked up only once and reused for the lifetime of the endpoint. The bean should be thread-safe in case concurrent threads is calling the bean at the same time. When using request scope the bean is created or looked up once per request (exchange). This can be used if you want to store state on a bean while processing a request and you want to call the same bean instance multiple times while processing the request. The bean does not have to be thread-safe as the instance is only called from the same request. When using delegate scope, then the bean will be looked up or created per call. However in case of lookup then this is delegated to the bean registry such as Spring or CDI (if in use), which depends on their configuration can act as either singleton or prototype scope. so when using prototype then this depends on the delegated registry. There are 3 enums and the value can be one of: Singleton, Request, Prototype

Singleton

BeanScope

autowiredEnabled (advanced)

Whether autowiring is enabled. This is used for automatic autowiring options (the option must be marked as autowired) by looking up in the registry to find if there is a single instance of matching type, which then gets configured on the component. This can be used for automatic configuring JDBC data sources, JMS connection factories, AWS Clients, etc.

true

boolean

The Class endpoint is configured using URI syntax:

class:beanName

with the following path and query parameters:

Path Parameters (1 parameters):

Name	Description	Default	Type
beanName	Required Sets the name of the bean to invoke		String

Name

Description

Default

Type

beanName

Required Sets the name of the bean to invoke

String

Query Parameters (5 parameters):

Name	Description	Default	Type
cache (common)	Deprecated Use scope option instead.		Boolean
method (common)	Sets the name of the method to invoke on the bean		String
scope (common)	Scope of bean. When using singleton scope (default) the bean is created or looked up only once and reused for the lifetime of the endpoint. The bean should be thread-safe in case concurrent threads is calling the bean at the same time. When using request scope the bean is created or looked up once per request (exchange). This can be used if you want to store state on a bean while processing a request and you want to call the same bean instance multiple times while processing the request. The bean does not have to be thread-safe as the instance is only called from the same request. When using prototype scope, then the bean will be looked up or created per call. However in case of lookup then this is delegated to the bean registry such as Spring or CDI (if in use), which depends on their configuration can act as either singleton or prototype scope. so when using prototype then this depends on the delegated registry. There are 3 enums and the value can be one of: Singleton, Request, Prototype	Singleton	BeanScope
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
parameters (advanced)	Used for configuring additional properties on the bean		Map

Name

Description

Default

Type

cache (common)

Deprecated Use scope option instead.

Boolean

method (common)

Sets the name of the method to invoke on the bean

String

scope (common)

Scope of bean. When using singleton scope (default) the bean is created or looked up only once and reused for the lifetime of the endpoint. The bean should be thread-safe in case concurrent threads is calling the bean at the same time. When using request scope the bean is created or looked up once per request (exchange). This can be used if you want to store state on a bean while processing a request and you want to call the same bean instance multiple times while processing the request. The bean does not have to be thread-safe as the instance is only called from the same request. When using prototype scope, then the bean will be looked up or created per call. However in case of lookup then this is delegated to the bean registry such as Spring or CDI (if in use), which depends on their configuration can act as either singleton or prototype scope. so when using prototype then this depends on the delegated registry. There are 3 enums and the value can be one of: Singleton, Request, Prototype

Singleton

BeanScope

lazyStartProducer (producer)

false

boolean

parameters (advanced)

Used for configuring additional properties on the bean

Map

Using

You simply use the class component just as the Bean component but by specifying the fully qualified classname instead.
For example to use the MyFooBean you have to do as follows:

    from("direct:start").to("class:org.apache.camel.component.bean.MyFooBean").to("mock:result");

You can also specify which method to invoke on the MyFooBean, for example hello:

    from("direct:start").to("class:org.apache.camel.component.bean.MyFooBean?method=hello").to("mock:result");

Setting properties on the created instance

In the endpoint uri you can specify properties to set on the created instance, for example if it has a setPrefix method:

   from("direct:start")
        .to("class:org.apache.camel.component.bean.MyPrefixBean?bean.prefix=Bye")
        .to("mock:result");

And you can also use the # syntax to refer to properties to be looked up in the Registry.

    from("direct:start")
        .to("class:org.apache.camel.component.bean.MyPrefixBean?bean.cool=#foo")
        .to("mock:result");

Which will lookup a bean from the Registry with the id foo and invoke the setCool method on the created instance of the MyPrefixBean class.

See more details at the Bean component as the class component works in much the same way.

Unresolved include directive in modules/ROOT/pages/class-component.adoc - include::latest@camel-spring-boot::page$bean-starter.adoc[]