Unable to remove the JAX-RS facet on a Dynamic Web Project version 3.1 ---------------------------------------------------------------------- Key: JBIDE-18117 URL: https://issues.jboss.org/browse/JBIDE-18117 Project: Tools (JBoss Tools) Issue Type: Bug Components: upstream, webservices Affects Versions: 4.2.0.Beta3 Reporter: Xavier Coulon Assignee: Xavier Coulon Fix For: 4.2.0.CR2 A bug in Eclipse WTP causes the following exception: {code} java.lang.ClassCastException: org.eclipse.jst.javaee.web.internal.impl.WebAppImpl cannot be cast to org.eclipse.jst.j2ee.webapplication.WebApp at org.eclipse.jst.ws.jaxrs.core.internal.project.facet.JAXRSFacetUninstallDelegate.uninstallJAXRSReferencesFromWebApp(JAXRSFacetUninstallDelegate.java:116) at org.eclipse.jst.ws.jaxrs.core.internal.project.facet.JAXRSFacetUninstallDelegate.execute(JAXRSFacetUninstallDelegate.java:85) at org.eclipse.wst.common.project.facet.core.internal.FacetedProject.callDelegate(FacetedProject.java:1477) at org.eclipse.wst.common.project.facet.core.internal.FacetedProject.modifyInternal(FacetedProject.java:441) at org.eclipse.wst.common.project.facet.core.internal.FacetedProject.mergeChangesInternal(FacetedProject.java:1181) at org.eclipse.wst.common.project.facet.core.internal.FacetedProject.access$2(FacetedProject.java:1117) at org.eclipse.wst.common.project.facet.core.internal.FacetedProject$5.run(FacetedProject.java:1099) at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2313) at org.eclipse.wst.common.project.facet.core.internal.FacetedProject.mergeChanges(FacetedProject.java:1109) at org.eclipse.wst.common.project.facet.core.internal.FacetedProjectWorkingCopy.commitChanges(FacetedProjectWorkingCopy.java:2020) at org.eclipse.wst.common.project.facet.ui.internal.FacetsPropertyPage$4.run(FacetsPropertyPage.java:232) at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2313) at org.eclipse.wst.common.project.facet.ui.internal.FacetsPropertyPage$5.run(FacetsPropertyPage.java:246) at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:122) {code} the problem comes from an evaluation that checks for dynamic project facet version 2.5 or 3.0 but not higher, in {{JAXRSJEEUtils#isWebApp25or40(Object)}}