In a servlet container you would get an error, when you deploy two different servlets with the same mapping (e.g. /foo/*).

I was wondering if the JAX-RS container (the used implementation) should not also give a warning, if ONE application has multiple "Application classes" with the same mapping (aka Application path).

I was wondering if I have the following:

@ApplicationPath("/")
public class Foo extends Application {
}

AND

@ApplicationPath("/")
public class Bar extends Application {
}

If the used JAX-RS container (implementation) should tell me, at deploy time: Dude, you are having to endpoints with the same mapping.

Other frameworks do similar (e.g. CDI does it when two classes use the same component name etc)