Set Variable

The SetVariable EIP is used for setting an Exchange variable.

Options

The Set Variable eip supports 2 options, which are listed below.

Name Description Default Type

description

Sets the description of this node.

String

disabled

Whether to disable this EIP from the route during build time. Once an EIP has been disabled then it cannot be enabled later at runtime.

false

Boolean

name

Required Name of variable to set a new value The simple language can be used to define a dynamic evaluated variable name to be used. Otherwise a constant name will be used.

String

expression

Required Expression to return the value of the variable.

ExpressionDefinition

The following example shows how to set a variable on the exchange in a Camel route:

  • Java

  • XML

from("direct:a")
    .setVariable("myVar", constant("test"))
    .to("direct:b");
<route>
    <from uri="direct:a"/>
    <setVariable name="myVar">
        <constant>test</constant>
    </setVariable>
    <to uri="direct:b"/>
</route>

Setting an variable from a message header

You can also set a variable with the value from a message header.

  • Java

  • XML

from("direct:a")
    .setVariable("foo", header("bar"))
    .to("direct:b");
<route>
    <from uri="direct:a"/>
    <setVariable name="foo">
        <header>bar</header>
    </setVariable>
    <to uri="direct:b"/>
</route>

Setting variable with the current message body

It is of course also possible to set a variable with a value from anything on the Exchange such as the message body:

  • Java

  • XML

from("direct:a")
    .setVariable("myBody", body())
    .to("direct:b");

We use the Simple language to refer to the message body:

<route>
    <from uri="direct:a"/>
    <setVariable name="myBody">
        <simple>${body}</simple>
    </setVariable>
    <to uri="direct:b"/>
</route>
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