Steps to reproduce:

• call the New EAR Application Project wizard
• select <None> as Target Runtime
• click Finish

You will get the following exception:

java.lang.NullPointerException
at org.jboss.ide.eclipse.as.core.JBoss4xEarFacetInstallListener.handleEvent(JBoss4xEarFacetInstallListener.java:57)
at org.eclipse.wst.common.project.facet.core.events.internal.ProjectListenerRegistry.notifyListeners(ProjectListenerRegistry.java:76)
at org.eclipse.wst.common.project.facet.core.internal.FacetedProject.notifyListeners(FacetedProject.java:1317)
at org.eclipse.wst.common.project.facet.core.internal.FacetedProject.modifyInternal(FacetedProject.java:451)
at org.eclipse.wst.common.project.facet.core.internal.FacetedProject.mergeChangesInternal(FacetedProject.java:1171)
at org.eclipse.wst.common.project.facet.core.internal.FacetedProject.access$2(FacetedProject.java:1107)
at org.eclipse.wst.common.project.facet.core.internal.FacetedProject$5.run(FacetedProject.java:1089)
at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:1800)
at org.eclipse.wst.common.project.facet.core.internal.FacetedProject.mergeChanges(FacetedProject.java:1099)
at org.eclipse.wst.common.project.facet.core.internal.FacetedProjectWorkingCopy.commitChanges(FacetedProjectWorkingCopy.java:1958)
at org.eclipse.wst.common.project.facet.ui.ModifyFacetedProjectWizard.performFinish(ModifyFacetedProjectWizard.java:400)
at org.eclipse.wst.web.ui.internal.wizards.NewProjectDataModelFacetWizard.performFinish(NewProjectDataModelFacetWizard.java:279)
at org.eclipse.wst.common.project.facet.ui.ModifyFacetedProjectWizard$3.run(ModifyFacetedProjectWizard.java:331)
at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:1800)
at org.eclipse.wst.common.project.facet.ui.ModifyFacetedProjectWizard$4.run(ModifyFacetedProjectWizard.java:345)
at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:121)

The solution is that the JBoss4xEarFacetInstallListener.handleEvent() does nothing if the project doesn't have any runtime.