java.io.IOException: is not web project: org.netbeans.modules.java.j2seproject.J2SEProject
   at org.netbeans.modules.projectimport.eclipse.web.WebProjectFactory.update(WebProjectFactory.java:330)
   at org.netbeans.modules.projectimport.eclipse.core.EclipseProjectReference.update(EclipseProjectReference.java:214)
   at org.netbeans.modules.projectimport.eclipse.core.UpgradableProject$1.run(UpgradableProject.java:91)
   at org.netbeans.modules.projectimport.eclipse.core.UpgradableProject$1.run(UpgradableProject.java:88)
   at org.openide.util.Mutex.writeAccess(Mutex.java:438)
Caused: java.io.IOException
   at org.netbeans.modules.projectimport.eclipse.core.UpgradableProject.update(UpgradableProject.java:96)
   at org.netbeans.modules.projectimport.eclipse.core.UpdateAllProjects.updateExistingProjects(UpdateAllProjects.java:194)
   at org.netbeans.modules.projectimport.eclipse.core.UpdateAllProjects.update(UpdateAllProjects.java:228)
   at org.netbeans.modules.projectimport.eclipse.core.ProjectOpenHookImpl$RunnableImpl.run(ProjectOpenHookImpl.java:88)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1452)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2032)