Overriding a Property value set in a properties file with a JVM System Property

As of Camel 2.5, a new capability now exists in the most excellent and quite useful Camel Properties component to override a property value at runtime using a JVM System property without the need to restart the application to pick up the change.
This may be accomplished by overriding a property value by creating or editing a JVM System property of the same name as the property it replaces.

An example of how this can be done is given below

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();

Further Details
https://issues.apache.org/activemq/browse/CAMEL-2791