NPEs

@turbomanage reported these.

Investigate npe exceptions and get rid of these errors

```
!SESSION 2015-04-21 11:49:22.686 -----------------------------------------------
eclipse.buildId=4.4.2.M20150204-1700
java.version=1.8.0_45
java.vendor=Oracle Corporation
BootLoader constants: OS=linux, ARCH=x86_64, WS=gtk, NL=en_US
Framework arguments: -product org.eclipse.epp.package.java.product
Command-line arguments: -os linux -ws gtk -arch x86_64 -product org.eclipse.epp.package.java.product

!ENTRY org.eclipse.equinox.p2.transport.ecf 2 0 2015-04-21 12:00:52.181
!MESSAGE Connection to http://mirror.cc.vt.edu/pub/eclipse/releases/luna/201406250900/plugins/org.eclipse.datatools.sqltools.sql_1.0.1.v201110050515.jar.pack.gz failed on Network is unreachable. Retry attempt 0 started
!STACK 0
java.net.ConnectException: Network is unreachable
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:345)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at org.eclipse.ecf.internal.provider.filetransfer.httpclient4.ECFHttpClientProtocolSocketFactory.connectSocket(ECFHttpClientProtocolSocketFactory.java:84)
at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:177)
at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:144)
at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:131)
at org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:611)
at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:446)
at org.apache.http.impl.client.AbstractHttpClient.doExecute(AbstractHttpClient.java:863)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82)
at org.eclipse.ecf.provider.filetransfer.httpclient4.HttpClientRetrieveFileTransfer.performConnect(HttpClientRetrieveFileTransfer.java:1077)
at org.eclipse.ecf.provider.filetransfer.httpclient4.HttpClientRetrieveFileTransfer.access$0(HttpClientRetrieveFileTransfer.java:1068)
at org.eclipse.ecf.provider.filetransfer.httpclient4.HttpClientRetrieveFileTransfer$1.performFileTransfer(HttpClientRetrieveFileTransfer.java:1064)
at org.eclipse.ecf.filetransfer.FileTransferJob.run(FileTransferJob.java:73)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)

!ENTRY org.eclipse.equinox.p2.transport.ecf 2 0 2015-04-21 12:01:00.193
!MESSAGE Connection to http://mirror.cc.vt.edu/pub/eclipse/releases/luna/201406250900/plugins/org.eclipse.jst.j2ee.ejb_1.1.800.v201404021630.jar.pack.gz failed on Network is unreachable. Retry attempt 0 started
!STACK 0
java.net.ConnectException: Network is unreachable
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:345)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at org.eclipse.ecf.internal.provider.filetransfer.httpclient4.ECFHttpClientProtocolSocketFactory.connectSocket(ECFHttpClientProtocolSocketFactory.java:84)
at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:177)
at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:144)
at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:131)
at org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:611)
at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:446)
at org.apache.http.impl.client.AbstractHttpClient.doExecute(AbstractHttpClient.java:863)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82)
at org.eclipse.ecf.provider.filetransfer.httpclient4.HttpClientRetrieveFileTransfer.performConnect(HttpClientRetrieveFileTransfer.java:1077)
at org.eclipse.ecf.provider.filetransfer.httpclient4.HttpClientRetrieveFileTransfer.access$0(HttpClientRetrieveFileTransfer.java:1068)
at org.eclipse.ecf.provider.filetransfer.httpclient4.HttpClientRetrieveFileTransfer$1.performFileTransfer(HttpClientRetrieveFileTransfer.java:1064)
at org.eclipse.ecf.filetransfer.FileTransferJob.run(FileTransferJob.java:73)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)

!ENTRY org.eclipse.equinox.p2.transport.ecf 2 0 2015-04-21 12:01:00.711
!MESSAGE Connection to http://mirror.cc.vt.edu/pub/eclipse/releases/luna/201406250900/plugins/org.eclipse.jst.j2ee.ejb_1.1.800.v201404021630.jar.pack.gz failed on Network is unreachable. Retry attempt 0 started
!STACK 0
java.net.ConnectException: Network is unreachable
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:345)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at org.eclipse.ecf.internal.provider.filetransfer.httpclient4.ECFHttpClientProtocolSocketFactory.connectSocket(ECFHttpClientProtocolSocketFactory.java:84)
at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:177)
at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:144)
at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:131)
at org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:611)
at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:446)
at org.apache.http.impl.client.AbstractHttpClient.doExecute(AbstractHttpClient.java:863)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82)
at org.eclipse.ecf.provider.filetransfer.httpclient4.HttpClientRetrieveFileTransfer.performConnect(HttpClientRetrieveFileTransfer.java:1077)
at org.eclipse.ecf.provider.filetransfer.httpclient4.HttpClientRetrieveFileTransfer.access$0(HttpClientRetrieveFileTransfer.java:1068)
at org.eclipse.ecf.provider.filetransfer.httpclient4.HttpClientRetrieveFileTransfer$1.performFileTransfer(HttpClientRetrieveFileTransfer.java:1064)
at org.eclipse.ecf.filetransfer.FileTransferJob.run(FileTransferJob.java:73)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)
!SESSION 2015-04-21 16:19:16.316 -----------------------------------------------
eclipse.buildId=4.4.2.M20150204-1700
java.version=1.8.0_45
java.vendor=Oracle Corporation
BootLoader constants: OS=linux, ARCH=x86_64, WS=gtk, NL=en_US
Framework arguments: -product org.eclipse.epp.package.java.product
Command-line arguments: -os linux -ws gtk -arch x86_64 -product org.eclipse.epp.package.java.product

!ENTRY org.eclipse.wst.common.project.facet.core 4 0 2015-04-21 16:30:06.026
!MESSAGE Category com.google.gwt.facet has not been defined. It is used in plugin com.google.gwt.eclipse.wtp.

!ENTRY com.google.appengine.eclipse.wtp.maven 1 0 2015-04-21 16:30:12.024
!MESSAGE GaeProjectConfigurator.getBuildParticipant invoked

!ENTRY org.eclipse.wst.common.project.facet.core 4 0 2015-04-21 16:30:20.969
!MESSAGE Preset com.google.gwt.facet.preset.gwtonly in plugin com.google.gwt.eclipse.wtp uses unknown version "1.6,1.7,1.8" of facet "jst.java".

!ENTRY org.eclipse.wst.common.project.facet.core 4 0 2015-04-21 16:30:21.229
!MESSAGE Project facet wst.jsdt.web has not been defined. It is used in plugin org.eclipse.jst.server.core.

!ENTRY org.eclipse.wst.common.emf 4 0 2015-04-21 16:32:26.573
!MESSAGE
!STACK 0
java.lang.NullPointerException
at org.eclipse.wst.xml.core.internal.document.XMLModelUpdater.replaceSource(XMLModelUpdater.java:1627)
at org.eclipse.wst.xml.core.internal.document.XMLModelUpdater.replaceChild(XMLModelUpdater.java:1585)
at org.eclipse.wst.xml.core.internal.document.DOMModelImpl.childReplaced(DOMModelImpl.java:192)
at org.eclipse.wst.xml.core.internal.document.NodeContainer.notifyChildReplaced(NodeContainer.java:361)
at org.eclipse.wst.xml.core.internal.document.NodeContainer.insertBefore(NodeContainer.java:302)
at org.eclipse.wst.xml.core.internal.document.ElementImpl.insertBefore(ElementImpl.java:755)
at org.eclipse.wst.common.internal.emf.utilities.DOMUtilities.insertBeforeNode(DOMUtilities.java:356)
at org.eclipse.wst.common.internal.emf.utilities.DOMUtilities.insertBeforeNodeAndWhitespace(DOMUtilities.java:381)
at org.eclipse.wst.common.internal.emf.resource.EMF2DOMAdapterImpl.primUpdateDOMMultiFeature(EMF2DOMAdapterImpl.java:405)
at org.eclipse.wst.common.internal.emf.resource.EMF2DOMAdapterImpl.primUpdateDOMMultiFeature(EMF2DOMAdapterImpl.java:1416)
at org.eclipse.wst.common.internal.emf.resource.EMF2DOMAdapterImpl.updateDOMMultiFeature(EMF2DOMAdapterImpl.java:1678)
at org.eclipse.wst.common.internal.emf.resource.EMF2DOMAdapterImpl.updateDOMFeature(EMF2DOMAdapterImpl.java:1617)
at org.eclipse.wst.common.internal.emf.resource.EMF2DOMAdapterImpl.primUpdateDOM(EMF2DOMAdapterImpl.java:982)
at org.eclipse.wst.xml.core.internal.emf2xml.EMF2DOMSSEAdapter.updateDOM(EMF2DOMSSEAdapter.java:477)
at org.eclipse.wst.common.internal.emf.resource.EMF2DOMAdapterImpl.primUpdateDOMMultiFeature(EMF2DOMAdapterImpl.java:414)
at org.eclipse.wst.common.internal.emf.resource.EMF2DOMAdapterImpl.updateDOMRootFeature(EMF2DOMAdapterImpl.java:1002)
at org.eclipse.wst.common.internal.emf.resource.EMF2DOMAdapterImpl.primUpdateDOM(EMF2DOMAdapterImpl.java:978)
at org.eclipse.wst.xml.core.internal.emf2xml.EMF2DOMSSEAdapter.updateDOM(EMF2DOMSSEAdapter.java:477)
at org.eclipse.wst.common.internal.emf.resource.EMF2DOMRenderer.createDOMTree(EMF2DOMRenderer.java:129)
at org.eclipse.wst.xml.core.internal.emf2xml.EMF2DOMSSERenderer.createDOMTreeIfNecessary(EMF2DOMSSERenderer.java:194)
at org.eclipse.wst.xml.core.internal.emf2xml.EMF2DOMSSERenderer.doSave(EMF2DOMSSERenderer.java:251)
at org.eclipse.wst.common.internal.emf.resource.TranslatorResourceImpl.doSave(TranslatorResourceImpl.java:190)
at org.eclipse.wst.common.internal.emf.resource.TranslatorResourceImpl.save(TranslatorResourceImpl.java:170)
at org.eclipse.wst.common.internal.emf.resource.ReferencedXMIResourceImpl.saveIfNecessary(ReferencedXMIResourceImpl.java:287)
at org.eclipse.jpt.common.core.internal.resource.xml.AbstractJptXmlResourceProvider.createFileAndResource_(AbstractJptXmlResourceProvider.java:193)
at org.eclipse.jpt.common.core.internal.resource.xml.AbstractJptXmlResourceProvider$CreateFileAndResourceWorkspaceRunnable.run(AbstractJptXmlResourceProvider.java:181)
at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2313)
at org.eclipse.jpt.common.core.internal.resource.xml.AbstractJptXmlResourceProvider.createFileAndResource(AbstractJptXmlResourceProvider.java:163)
at org.eclipse.jpt.common.core.internal.operations.AbstractJptFileCreationOperation.createFile(AbstractJptFileCreationOperation.java:94)
at org.eclipse.jpt.common.core.internal.operations.AbstractJptFileCreationOperation.execute(AbstractJptFileCreationOperation.java:48)
at org.eclipse.wst.common.frameworks.internal.datamodel.DataModelPausibleOperationImpl$1.run(DataModelPausibleOperationImpl.java:385)
at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2313)
at org.eclipse.wst.common.frameworks.internal.datamodel.DataModelPausibleOperationImpl.runOperation(DataModelPausibleOperationImpl.java:410)
at org.eclipse.wst.common.frameworks.internal.datamodel.DataModelPausibleOperationImpl.runOperation(DataModelPausibleOperationImpl.java:360)
at org.eclipse.wst.common.frameworks.internal.datamodel.DataModelPausibleOperationImpl.doExecute(DataModelPausibleOperationImpl.java:247)
at org.eclipse.wst.common.frameworks.internal.datamodel.DataModelPausibleOperationImpl.executeImpl(DataModelPausibleOperationImpl.java:219)
at org.eclipse.wst.common.frameworks.internal.datamodel.DataModelPausibleOperationImpl.cacheThreadAndContinue(DataModelPausibleOperationImpl.java:89)
at org.eclipse.wst.common.frameworks.internal.datamodel.DataModelPausibleOperationImpl.execute(DataModelPausibleOperationImpl.java:207)
at org.eclipse.jpt.jpa.core.internal.facet.JpaFacetInstallDelegate.createPersistenceXml(JpaFacetInstallDelegate.java:111)
at org.eclipse.jpt.jpa.core.internal.facet.JpaFacetInstallDelegate.createProjectXml(JpaFacetInstallDelegate.java:100)
at org.eclipse.jpt.jpa.core.internal.facet.JpaFacetInstallDelegate.execute_(JpaFacetInstallDelegate.java:61)
at org.eclipse.jpt.jpa.core.internal.facet.JpaFacetActionDelegate.execute(JpaFacetActionDelegate.java:35)
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 com.google.appengine.eclipse.wtp.maven.JpaFacetManager.ensureLatestJpaFacetVersionInstalled(JpaFacetManager.java:93)
at com.google.appengine.eclipse.wtp.maven.JpaFacetManager.configureJpaFacet(JpaFacetManager.java:52)
at com.google.appengine.eclipse.wtp.maven.GaeProjectConfigurator.configure(GaeProjectConfigurator.java:47)
at org.eclipse.m2e.core.project.configurator.AbstractLifecycleMapping.configure(AbstractLifecycleMapping.java:120)
at org.eclipse.m2e.core.internal.project.ProjectConfigurationManager$3.call(ProjectConfigurationManager.java:477)
at org.eclipse.m2e.core.internal.project.ProjectConfigurationManager$3.call(ProjectConfigurationManager.java:1)
at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.executeBare(MavenExecutionContext.java:166)
at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:142)
at org.eclipse.m2e.core.internal.project.ProjectConfigurationManager.updateProjectConfiguration(ProjectConfigurationManager.java:470)
at org.eclipse.m2e.core.internal.project.ProjectConfigurationManager.configureNewMavenProjects(ProjectConfigurationManager.java:250)
at org.eclipse.m2e.core.internal.project.ProjectConfigurationManager$1.call(ProjectConfigurationManager.java:163)
at org.eclipse.m2e.core.internal.project.ProjectConfigurationManager$1.call(ProjectConfigurationManager.java:1)
at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.executeBare(MavenExecutionContext.java:166)
at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:142)
at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:96)
at org.eclipse.m2e.core.internal.embedder.MavenImpl.execute(MavenImpl.java:1348)
at org.eclipse.m2e.core.internal.project.ProjectConfigurationManager.importProjects(ProjectConfigurationManager.java:133)
at org.eclipse.m2e.core.ui.internal.wizards.ImportMavenProjectsJob$1.doCreateMavenProjects(ImportMavenProjectsJob.java:73)
at org.eclipse.m2e.core.ui.internal.wizards.AbstractCreateMavenProjectsOperation.run(AbstractCreateMavenProjectsOperation.java:62)
at org.eclipse.m2e.core.ui.internal.wizards.ImportMavenProjectsJob.runInWorkspace(ImportMavenProjectsJob.java:82)
at org.eclipse.core.internal.resources.InternalWorkspaceJob.run(InternalWorkspaceJob.java:38)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)

!ENTRY com.google.gwt.eclipse.wtp 4 1 2015-04-21 16:32:26.998
!MESSAGE Google GWT: GwtFacetInstallSdkDelegate: Maven detected, skipping standard GWT classpath container.

!ENTRY com.google.appengine.eclipse.wtp.maven 1 0 2015-04-21 16:33:22.398
!MESSAGE GaeProjectConfigurator.getBuildParticipant invoked

!ENTRY com.google.appengine.eclipse.wtp.maven 1 0 2015-04-21 16:33:30.211
!MESSAGE GaeProjectConfigurator.getBuildParticipant invoked

!ENTRY com.google.appengine.eclipse.wtp.maven 1 0 2015-04-21 16:34:03.658
!MESSAGE GaeProjectConfigurator.getBuildParticipant invoked

!ENTRY com.google.appengine.eclipse.core 4 0 2015-04-21 16:34:06.849
!MESSAGE Datanucleus enhancer terminated with exit code 1.
Navigate to the console view for "Datanucleus Enhancer" for more information

!ENTRY com.google.appengine.eclipse.wtp.maven 1 0 2015-04-21 16:35:19.584
!MESSAGE GaeProjectConfigurator.getBuildParticipant invoked

!ENTRY com.google.appengine.eclipse.wtp.maven 1 0 2015-04-21 16:36:02.911
!MESSAGE GaeProjectConfigurator.getBuildParticipant invoked

!ENTRY com.google.appengine.eclipse.wtp.maven 1 0 2015-04-21 16:36:52.878
!MESSAGE GaeProjectConfigurator.getBuildParticipant invoked

!ENTRY com.google.appengine.eclipse.wtp.maven 1 0 2015-04-21 16:36:56.059
!MESSAGE GaeProjectConfigurator.getBuildParticipant invoked

!ENTRY com.google.appengine.eclipse.wtp.maven 1 0 2015-04-21 16:39:48.152
!MESSAGE GaeProjectConfigurator.getBuildParticipant invoked

!ENTRY com.google.appengine.eclipse.wtp.maven 1 0 2015-04-21 16:39:53.702
!MESSAGE GaeProjectConfigurator.getBuildParticipant invoked

!ENTRY org.eclipse.ui.navigator 2 0 2015-04-21 16:44:19.156
!MESSAGE Can't find Navigator Content Descriptor with id: org.eclipse.jst.servlet.ui.EnhancedJavaRendering

!ENTRY com.google.gwt.eclipse.wtp 4 1 2015-04-21 16:46:23.169
!MESSAGE Google GWT: setLauncherIdToWtpRunTimeLaunchConfig: Adding server launcherId id=20c144c0-f321-4bc0-aa3b-537f24acb452

!ENTRY com.google.gwt.eclipse.wtp 4 1 2015-04-21 16:46:23.207
!MESSAGE Google GWT: posiblyLaunchGwtSuperDevModeCodeServer: Launching GWT Super Dev Mode CodeServer.

!ENTRY org.eclipse.jdt.launching 4 101 2015-04-21 16:46:25.463
!MESSAGE Main type not specified
!SESSION 2015-05-06 14:37:44.381 -----------------------------------------------
eclipse.buildId=4.4.2.M20150204-1700
java.version=1.8.0_45
java.vendor=Oracle Corporation
BootLoader constants: OS=linux, ARCH=x86_64, WS=gtk, NL=en_US
Framework arguments: -product org.eclipse.epp.package.java.product
Command-line arguments: -os linux -ws gtk -arch x86_64 -product org.eclipse.epp.package.java.product

!ENTRY org.eclipse.core.resources 2 10035 2015-05-06 14:37:53.389
!MESSAGE The workspace exited with unsaved changes in the previous session; refreshing workspace to recover changes.

!ENTRY org.eclipse.wst.common.project.facet.core 4 0 2015-05-06 14:38:56.104
!MESSAGE Category com.google.gwt.facet has not been defined. It is used in plugin com.google.gwt.eclipse.wtp.

!ENTRY com.google.appengine.eclipse.wtp.maven 1 0 2015-05-06 14:39:38.972
!MESSAGE GaeProjectConfigurator.getBuildParticipant invoked

!ENTRY com.google.gwt.eclipse.core 4 0 2015-05-06 14:41:55.695
!MESSAGE Could not stop source viewer server.
!STACK 0
java.lang.ExceptionInInitializerError
at com.google.gdt.eclipse.platform.jetty.JettyServer.initLogging(JettyServer.java:40)
at com.google.gdt.eclipse.platform.jetty.JettyServer.(JettyServer.java:30)
at com.google.gwt.eclipse.core.GWTPlugin.stop(GWTPlugin.java:149)
at org.eclipse.osgi.internal.framework.BundleContextImpl$4.run(BundleContextImpl.java:827)
at org.eclipse.osgi.internal.framework.BundleContextImpl$4.run(BundleContextImpl.java:1)
at java.security.AccessController.doPrivileged(Native Method)
at org.eclipse.osgi.internal.framework.BundleContextImpl.stop(BundleContextImpl.java:820)
at org.eclipse.osgi.internal.framework.EquinoxBundle.stopWorker0(EquinoxBundle.java:950)
at org.eclipse.osgi.internal.framework.EquinoxBundle$EquinoxModule.stopWorker(EquinoxBundle.java:324)
at org.eclipse.osgi.container.Module.doStop(Module.java:626)
at org.eclipse.osgi.container.Module.stop(Module.java:488)
at org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.decStartLevel(ModuleContainer.java:1623)
at org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.doContainerStartLevel(ModuleContainer.java:1542)
at org.eclipse.osgi.container.SystemModule.stopWorker(SystemModule.java:248)
at org.eclipse.osgi.internal.framework.EquinoxBundle$SystemBundle$EquinoxSystemModule.stopWorker(EquinoxBundle.java:145)
at org.eclipse.osgi.container.Module.doStop(Module.java:626)
at org.eclipse.osgi.container.Module.stop(Module.java:488)
at org.eclipse.osgi.container.SystemModule.stop(SystemModule.java:186)
at org.eclipse.osgi.internal.framework.EquinoxBundle$SystemBundle$EquinoxSystemModule$1.run(EquinoxBundle.java:160)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.IllegalArgumentException: Logging bundle must not be null.
at org.eclipse.core.internal.runtime.Log.(Log.java:30)
at org.eclipse.core.internal.runtime.InternalPlatform.getLog(InternalPlatform.java:351)
at org.eclipse.core.runtime.Platform.getLog(Platform.java:1017)
at com.google.gdt.eclipse.platform.jetty.JettyEclipseLogger.(JettyEclipseLogger.java:35)
... 20 more
!SESSION 2015-05-06 14:41:58.769 -----------------------------------------------
eclipse.buildId=4.4.2.M20150204-1700
java.version=1.8.0_45
java.vendor=Oracle Corporation
BootLoader constants: OS=linux, ARCH=x86_64, WS=gtk, NL=en_US
Framework arguments: -product org.eclipse.epp.package.java.product
Command-line arguments: -os linux -ws gtk -arch x86_64 -product org.eclipse.epp.package.java.product

!ENTRY org.eclipse.ui.navigator 2 0 2015-05-06 14:43:49.813
!MESSAGE Can't find Navigator Content Descriptor with id: org.eclipse.jst.servlet.ui.EnhancedJavaRendering

!ENTRY com.google.appengine.eclipse.wtp.maven 1 0 2015-05-06 14:45:46.839
!MESSAGE GaeProjectConfigurator.getBuildParticipant invoked

!ENTRY org.eclipse.wst.common.project.facet.core 4 0 2015-05-06 14:45:52.338
!MESSAGE Project facet wst.jsdt.web has not been defined. It is used in plugin org.eclipse.jst.server.core.

!ENTRY com.google.appengine.eclipse.wtp.maven 1 0 2015-05-06 14:46:30.962
!MESSAGE GaeProjectConfigurator.getBuildParticipant invoked

!ENTRY com.google.appengine.eclipse.core 4 0 2015-05-06 14:47:20.163
!MESSAGE Datanucleus enhancer terminated with exit code 1.
Navigate to the console view for "Datanucleus Enhancer" for more information

!ENTRY com.google.appengine.eclipse.wtp.maven 1 0 2015-05-06 14:47:30.986
!MESSAGE GaeProjectConfigurator.getBuildParticipant invoked

!ENTRY com.google.appengine.eclipse.wtp.maven 1 0 2015-05-06 14:47:38.741
!MESSAGE GaeProjectConfigurator.getBuildParticipant invoked

```

Bắt đầu bằng cách tái hiện thao tác Eclipse workspace được báo cáo và lần theo lỗi từ XMLModelUpdater.replaceSource qua EMF2DOMAdapterImpl và AbstractJptFileCreationOperation. Xác định NPE nào trong các NPE được báo cáo là cần xử lý, thay vì coi các thông báo không liên quan về network và facet là mục tiêu. Hoàn tất khi việc tái hiện không còn tạo ra NullPointerException được báo cáo.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.