[[class-component]]
= Class Component

*Available as of Camel version 2.4*

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

=== URI format

[source]
----
class:className[?options]
----

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

=== Options


// component options: START
The Class component supports 2 options, which are listed below.



[width="100%",cols="2,5,^1,2",options="header"]
|===
| Name | Description | Default | Type
| *cache* (advanced) | 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. |  | Boolean
| *resolveProperty Placeholders* (advanced) | Whether the component should resolve property placeholders on itself when starting. Only properties which are of String type can use property placeholders. | true | boolean
|===
// component options: END



// endpoint options: START
The Class endpoint is configured using URI syntax:

----
class:beanName
----

with the following path and query parameters:

=== Path Parameters (1 parameters):


[width="100%",cols="2,5,^1,2",options="header"]
|===
| Name | Description | Default | Type
| *beanName* | *Required* Sets the name of the bean to invoke |  | String
|===


=== Query Parameters (5 parameters):


[width="100%",cols="2,5,^1,2",options="header"]
|===
| Name | Description | Default | Type
| *method* (producer) | Sets the name of the method to invoke on the bean |  | String
| *cache* (advanced) | 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. |  | Boolean
| *multiParameterArray* (advanced) | *Deprecated* How to treat the parameters which are passed from the message body; if it is true, the message body should be an array of parameters. Note: This option is used internally by Camel, and is not intended for end users to use. Deprecation note: This option is used internally by Camel, and is not intended for end users to use. | false | boolean
| *parameters* (advanced) | Used for configuring additional properties on the bean |  | Map
| *synchronous* (advanced) | Sets whether synchronous processing should be strictly used, or Camel is allowed to use asynchronous processing (if supported). | false | boolean
|===
// endpoint options: END


=== Using

You simply use the *class* component just as the <<bean-component,Bean>>
component but by specifying the fully qualified classname instead. +
 For example to use the `MyFooBean` you have to do as follows:

[source,java]
-------------------------------------------------------------------------------------------------
    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`:

[source,java]
--------------------------------------------------------------------------------------------------------------
    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:

[source,java]
---------------------------------------------------------------------------------
   // Camel 2.17 onwards
   from("direct:start")
        .to("class:org.apache.camel.component.bean.MyPrefixBean?bean.prefix=Bye")
        .to("mock:result");
 
   // Camel 2.16 and older 
   from("direct:start")
        .to("class:org.apache.camel.component.bean.MyPrefixBean?prefix=Bye")
        .to("mock:result");
---------------------------------------------------------------------------------

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

[source,java]
--------------------------------------------------------------------------------
    // Camel 2.17 onwards
    from("direct:start")
        .to("class:org.apache.camel.component.bean.MyPrefixBean?bean.cool=#foo")
        .to("mock:result");

    // Camel 2.16 and older
    from("direct:start")
        .to("class:org.apache.camel.component.bean.MyPrefixBean?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.

TIP:See more details at the <<bean-component,Bean>> component as the *class*
component works in much the same way.

=== See Also

* Configuring Camel
* Component
* Endpoint
* Getting Started

* <<bean-component,Bean>>
* Bean Binding
* Bean Integration
