STEP: in #1 workspace create project with AS 7.1 as targeted runtime and with jaxrs service but WITHOUT jaxrs support: package test; import javax.ws.rs.GET; import javax.ws.rs.Path; @Path( "/ rest " ) public class A { @GET public void method() { } } STEP: in #2 workspace import the project (workspace has not defined AS7.1 runtime) ASSERT: bullding problems (java ee packages cannot be resolved) STEP: add jaxrs support into the project FAIL: two warnings thrown in error log: Could not find type 'javax.ws.rs.core.Application' in project's classpath. Unable to find type with fully qualified name 'javax.ws.rs.core.Application' in Java Project 'prj'