java.lang.IllegalArgumentException: Compilation unit name must end with .java, or one of the registered Java-like extensions
	at org.eclipse.jdt.internal.core.PackageFragment.getCompilationUnit(PackageFragment.java:213)
	at org.eclipse.jdt.internal.core.util.Util.getCompilationUnit(Util.java:773)
	at org.eclipse.jdt.internal.core.util.Util.getUnresolvedJavaElement(Util.java:1531)
	at org.eclipse.jdt.core.dom.TypeBinding.getUnresolvedJavaElement(TypeBinding.java:527)
	at org.eclipse.jdt.core.dom.TypeBinding.getUnresolvedJavaElement(TypeBinding.java:518)
	at org.eclipse.jdt.core.dom.TypeBinding.getJavaElement(TypeBinding.java:500)
	at org.jboss.tools.ws.jaxrs.core.jdt.JavaMethodSignaturesVisitor.getReturnType(JavaMethodSignaturesVisitor.java:120)
	at org.jboss.tools.ws.jaxrs.core.jdt.JavaMethodSignaturesVisitor.visit(JavaMethodSignaturesVisitor.java:80)
	at org.eclipse.jdt.core.dom.MethodDeclaration.accept0(MethodDeclaration.java:489)
	at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2514)
	at org.eclipse.jdt.core.dom.ASTNode.acceptChildren(ASTNode.java:2585)
	at org.eclipse.jdt.core.dom.TypeDeclaration.accept0(TypeDeclaration.java:484)
	at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2514)
	at org.eclipse.jdt.core.dom.ASTNode.acceptChildren(ASTNode.java:2585)
	at org.eclipse.jdt.core.dom.CompilationUnit.accept0(CompilationUnit.java:220)
	at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2514)
	at org.jboss.tools.ws.jaxrs.core.jdt.JdtUtils.resolveMethodSignatures(JdtUtils.java:669)
	at org.jboss.tools.ws.jaxrs.core.internal.metamodel.domain.JaxrsResource$Builder.build(JaxrsResource.java:139)
	at org.jboss.tools.ws.jaxrs.core.internal.metamodel.domain.JaxrsElementFactory.createElements(JaxrsElementFactory.java:156)
	at org.jboss.tools.ws.jaxrs.core.internal.metamodel.domain.JaxrsElementFactory.createElements(JaxrsElementFactory.java:64)
	at org.jboss.tools.ws.jaxrs.core.internal.metamodel.domain.JaxrsMetamodel.processResourceChange(JaxrsMetamodel.java:660)
	at org.jboss.tools.ws.jaxrs.core.internal.metamodel.domain.JaxrsMetamodel.processProject(JaxrsMetamodel.java:594)
	at org.jboss.tools.ws.jaxrs.core.internal.metamodel.builder.ResourceChangedBuildJob.run(ResourceChangedBuildJob.java:64)
	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:53)