Apache Camel: how store variable for later use

Question

while \'playing around\' with Camel using Spring DSL, I came across the following problem. Suppose the expected message flow looks like this:

1. client sends HTTP POS

Answer 1

I leave you some examples:

<setHeader headerName="token">
    <constant>someValue</constant>
</setHeader>

<setHeader headerName="userName">
    <simple>${properties:userName}</simple>  //from config
</setHeader>

<setProperty propertyName="bodyBkp">
    <simple>${in.body}</simple>
</setProperty>

<setProperty propertyName="orderNumber">
    <xpath resultType="String">//item[1]/orderNumber/text()</xpath>
</setProperty>

Getter

${exchangeProperty[orderNumber]}

${in.headers.token}

Documentation

Check the simple expression language: http://camel.apache.org/simple.html

Sometimes looking at the test cases of Camel can be helpful as well, in particular for Spring DSL:

• setProperty with Spring DSL
• setHeader using XPATH with Spring DSL
• simple expression language test

Answer 2

you can set store data in the Exchange properties or message headers like this...

.setHeader("ID", XPathBuilder.xpath("/order/@id", String.class))
.setProperty("ID", XPathBuilder.xpath("/order/@id", String.class))

and then retrieve them in a bean/processor from the Exchange like this...

String propId = (String) exchange.getProperty("ID");
String headerId = (String) exchange.getIn().getHeader("ID");                        }