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PropertiesComponent pc = context.getComponent("properties", PropertiesComponent.class);
pc.setCache(false);
        
System.setProperty("cool.end", "mock:override");
System.setProperty("cool.result", "override");

context.addRoutes(new RouteBuilder() {
    @Override
    public void configure() throws Exception {
        from("direct:start").to("properties:cool.end");
        from("direct:foo").to("properties:mock:{{cool.result}}");
    }
});
context.start();

getMockEndpoint("mock:override").expectedMessageCount(2);

template.sendBody("direct:start", "Hello World");
template.sendBody("direct:foo", "Hello Foo");

System.clearProperty("cool.end");
System.clearProperty("cool.result");
        
assertMockEndpointsSatisfied();

Unit tests

See the unit tests in camel-core and camel-spring

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Using property placeholders for any kind of attribute in the XML DSL

Available as of Camel 2.7

Previously it was only the xs:string type attributes in the XML DSL that support placeholders. For example often a timeout attribute would be a xs:int type and thus you cannot set a string value as the placeholder key. This is now possible from Camel 2.7 onwards using a special placeholder namespace.

In the example below we use the prop prefix for the namespace http://camel.apache.org/schema/placeholderImage Added by which we can use the prop prefix in the attributes in the XML DSLs. Notice how we use that in the Multicast to indicate that the option stopOnException should be the value of the placeholder with the key "stop".

{snippet:id=e1|lang=xml|url=camel/trunk/components/camel-spring/src/test/resources/org/apache/camel/component/properties/SpringOptionalPropertiesDslTest.xml}

In our properties file we have the value defined as

stop=true

Using property placeholder in the Java DSL

Available as of Camel 2.7

Likewise we have added support for defining placeholders in the Java DSL using the new placeholder DSL as shown in the following equivalent example:

{snippet:id=e1|lang=java|url=camel/trunk/camel-core/src/test/java/org/apache/camel/component/properties/OptionalPropertiesDslTest.java}

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