1. org.eclipse.core.runtime.AssertionFailedException: null argument:
2. at org.eclipse.core.runtime.Assert.isNotNull(Assert.java:85)
3. at org.eclipse.core.runtime.Assert.isNotNull(Assert.java:73)
4. at org.eclipse.core.expressions.EvaluationContext.addVariable(EvaluationContext.java:117)
5. at org.eclipse.jst.common.project.facet.core.libprov.internal.LibraryProvider.isEnabledFor(LibraryProvider.java:273)
6. at org.eclipse.jst.common.project.facet.core.libprov.LibraryInstallDelegate.refresh(LibraryInstallDelegate.java:364)
7. at org.eclipse.jst.common.project.facet.core.libprov.LibraryInstallDelegate.reset(LibraryInstallDelegate.java:450)
8. at org.eclipse.jst.common.project.facet.core.libprov.LibraryInstallDelegate.<init>(LibraryInstallDelegate.java:138)
9. at org.eclipse.jpt.jpa.core.internal.facet.JpaFacetDataModelProvider.buildDefaultLibraryProvider(JpaFacetDataModelProvider.java:237)
10. at org.eclipse.jpt.jpa.core.internal.facet.JpaFacetDataModelProvider.getDefaultLibraryProvider(JpaFacetDataModelProvider.java:209)
11. at org.eclipse.jpt.jpa.core.internal.facet.JpaFacetDataModelProvider.getDefaultProperty(JpaFacetDataModelProvider.java:174)
12. at org.eclipse.jpt.jpa.core.internal.facet.JpaFacetInstallDataModelProvider.getDefaultProperty(JpaFacetInstallDataModelProvider.java:84)
13. at org.eclipse.wst.common.frameworks.internal.datamodel.DataModelImpl.getProperty(DataModelImpl.java:130)
14. at org.eclipse.wst.common.frameworks.datamodel.AbstractDataModelProvider.getProperty(AbstractDataModelProvider.java:218)
15. at org.eclipse.jpt.jpa.core.internal.facet.JpaFacetDataModelProvider.getLibraryInstallDelegate(JpaFacetDataModelProvider.java:111)
16. at org.eclipse.jpt.jpa.core.internal.facet.JpaFacetDataModelProvider.adjustLibraryProviders(JpaFacetDataModelProvider.java:391)
17. at org.eclipse.jpt.jpa.core.internal.facet.JpaFacetDataModelProvider.propertySet(JpaFacetDataModelProvider.java:295)
18. at org.eclipse.jpt.jpa.core.internal.facet.JpaFacetInstallDataModelProvider.propertySet(JpaFacetInstallDataModelProvider.java:143)
19. at org.eclipse.wst.common.frameworks.internal.datamodel.DataModelImpl.internalSetProperty(DataModelImpl.java:182)
20. at org.eclipse.wst.common.frameworks.internal.datamodel.DataModelImpl.setProperty(DataModelImpl.java:172)
21. at org.eclipse.wst.common.componentcore.datamodel.FacetDataModelConfigAdapter.setProjectFacetVersion(FacetDataModelConfigAdapter.java:42)
22. at org.eclipse.wst.common.project.facet.core.internal.FacetedProjectWorkingCopy.bindProjectFacetActionConfig(FacetedProjectWorkingCopy.java:1529)
23. at org.eclipse.wst.common.project.facet.core.internal.FacetedProjectWorkingCopy.createProjectFacetAction(FacetedProjectWorkingCopy.java:1464)
24. at org.eclipse.wst.common.project.facet.core.internal.FacetedProjectWorkingCopy.refreshProjectFacetActions(FacetedProjectWorkingCopy.java:1558)
25. at org.eclipse.wst.common.project.facet.core.internal.FacetedProjectWorkingCopy.setProjectFacets(FacetedProjectWorkingCopy.java:777)
26. at org.eclipse.wst.common.project.facet.core.internal.FacetedProjectWorkingCopy.addProjectFacet(FacetedProjectWorkingCopy.java:807)
27. at org.eclipse.wst.common.project.facet.core.internal.FacetedProject$1.run(FacetedProject.java:301)
28. at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2313)
29. at org.eclipse.wst.common.project.facet.core.internal.FacetedProject.modify(FacetedProject.java:339)
30. at org.eclipse.m2e.wtp.jpa.internal.configurators.JpaProjectConfigurator.configureFacets(JpaProjectConfigurator.java:154)
31. at org.eclipse.m2e.wtp.jpa.internal.configurators.JpaProjectConfigurator.configure(JpaProjectConfigurator.java:109)
32. at org.eclipse.m2e.core.project.configurator.AbstractLifecycleMapping.configure(AbstractLifecycleMapping.java:120)
33. at org.eclipse.m2e.core.internal.project.ProjectConfigurationManager$3.call(ProjectConfigurationManager.java:477)
34. at org.eclipse.m2e.core.internal.project.ProjectConfigurationManager$3.call(ProjectConfigurationManager.java:1)
35. at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.executeBare(MavenExecutionContext.java:166)
36. at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:142)
37. at org.eclipse.m2e.core.internal.project.ProjectConfigurationManager.updateProjectConfiguration(ProjectConfigurationManager.java:470)
38. at org.eclipse.m2e.core.internal.project.ProjectConfigurationManager.updateProjectConfiguration0(ProjectConfigurationManager.java:408)
39. at org.eclipse.m2e.core.internal.project.ProjectConfigurationManager$2.call(ProjectConfigurationManager.java:321)
40. at org.eclipse.m2e.core.internal.project.ProjectConfigurationManager$2.call(ProjectConfigurationManager.java:1)
41. at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.executeBare(MavenExecutionContext.java:166)
42. at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:142)
43. at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:96)
44. at org.eclipse.m2e.core.internal.embedder.MavenImpl.execute(MavenImpl.java:1344)
45. at org.eclipse.m2e.core.internal.project.ProjectConfigurationManager.updateProjectConfiguration(ProjectConfigurationManager.java:318)
46. at org.eclipse.m2e.core.ui.internal.UpdateMavenProjectJob.runInWorkspace(UpdateMavenProjectJob.java:77)
47. at org.eclipse.core.internal.resources.InternalWorkspaceJob.run(InternalWorkspaceJob.java:38)
48. at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)

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