Apache-Camel Accessing header values within string-template

Question

my problem is, I don't know how I can access exchange's header values inside a string-template declaration. I would like to have internationalized mail templates. The test code below ...

public class StringTemplateTest extends CamelTestSupport {

    @EndpointInject(uri = "mock:result")
    protected MockEndpoint resultEndpoint;

    @Produce(uri = "direct:start")
    protected ProducerTemplate template;

    @Test
    public void testTemplating() throws Exception {
        resultEndpoint.expectedBodiesReceived("test");
        template.sendBodyAndHeader("test", "lang", "de");
        resultEndpoint.assertIsSatisfied();
    }

    @Override
    protected RouteBuilder createRouteBuilder() {
        return new RouteBuilder() {
            public void configure() {
                from("direct:start").to("string-template:mailTemplate_$simple{in.header.lang}.tm").to("mock:result");
            }
        };
    }
}

ends in a ...

java.io.FileNotFoundException: Cannot find resource: mailTemplate_$simple{in.header.lang}.tm in classpath for URI: mailTemplate_$simple{in.header.lang}.tm

I would expect, the string-template is lookig for mailTemplate_de.tm.

Thank you for help in advance!

vikingsteve · Accepted Answer · 2015-02-05 11:02:18Z

1

Your problem is that .to("component:xyz") endpoints are evaluated at the time the route is built - they are not dynamic and won't pick up ${} properties.

Instead you need to use recipientList, like this:

from("direct:start")
    .recipientList(simple("string_template:mailTemplate_${in.header.lang}.tm"))
    .to("mock:result")

answered Feb 5, 2015 at 11:02

vikingsteve

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1 Comment

Claus Ibsen Over a year ago

See this FAQ about dynamic to: camel.apache.org/how-to-use-a-dynamic-uri-in-to.html

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