java.lang.NoClassDefFoundError: org/eclipse/core/net/proxy/IProxyService
   at org.eclipse.mylyn.internal.commons.core.CommonsCorePlugin.start(CommonsCorePlugin.java:84)
   at org.eclipse.osgi.framework.internal.core.BundleContextImpl$1.run(BundleContextImpl.java:711)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
Caused: org.osgi.framework.BundleException: Exception in org.eclipse.mylyn.internal.commons.core.CommonsCorePlugin.start() of bundle org.eclipse.mylyn.commons.core.
   at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:734)
   at org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextImpl.java:683)
   at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:381)
   at org.eclipse.osgi.framework.internal.core.AbstractBundle.start(AbstractBundle.java:300)
   at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:478)
   at org.eclipse.osgi.internal.loader.BundleLoader.setLazyTrigger(BundleLoader.java:263)
Caused: org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter$TerminatingClassNotFoundException: An error occurred while automatically activating bundle org.eclipse.mylyn.commons.core (127).
   at org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:124)
   at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:469)
   at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:216)
   at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:395)
   at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:464)
   at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:421)
   at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:412)
   at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)
   at org.netbeans.modules.netbinox.NetbinoxLoader.loadClass(NetbinoxLoader.java:81)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
   at org.eclipse.osgi.internal.loader.BundleLoader.loadClass(BundleLoader.java:340)
   at org.eclipse.osgi.framework.internal.core.BundleHost.loadClass(BundleHost.java:229)
   at org.eclipse.osgi.framework.internal.core.AbstractBundle.loadClass(AbstractBundle.java:1212)
   at org.netbeans.core.netigso.NetigsoLoader.doLoadClass(NetigsoLoader.java:106)
   at org.netbeans.NetigsoModule$DelegateCL.doLoadClass(NetigsoModule.java:261)
   at org.netbeans.ProxyClassLoader.selfLoadClass(ProxyClassLoader.java:259)
   at org.netbeans.ProxyClassLoader.loadClass(ProxyClassLoader.java:187)
   at org.netbeans.ModuleManager$SystemClassLoader.loadClass(ModuleManager.java:722)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
   at org.netbeans.lib.uihandler.LogFormatter.printFrame(LogFormatter.java:155)
   at org.netbeans.lib.uihandler.LogFormatter.printCause(LogFormatter.java:210)
   at org.netbeans.lib.uihandler.LogFormatter.printThrown(LogFormatter.java:233)
   at org.netbeans.lib.uihandler.LogFormatter.format(LogFormatter.java:345)
   at org.netbeans.lib.uihandler.LogRecords.write(LogRecords.java:97)
   at org.netbeans.modules.uihandler.Installer.writeOut(Installer.java:509)
   at org.netbeans.modules.uihandler.UIHandler$2WriteOut.run(UIHandler.java:194)
Caused: java.lang.NoClassDefFoundError: org/eclipse/mylyn/commons/core/StatusHandler
   at org.eclipse.mylyn.internal.tasks.core.TaskRepositoryManager$5.handleException(TaskRepositoryManager.java:461)
   at org.eclipse.core.runtime.SafeRunner.handleException(SafeRunner.java:75)
   at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:46)
   at org.eclipse.mylyn.internal.tasks.core.TaskRepositoryManager.notifyRepositorySettingsChanged(TaskRepositoryManager.java:459)
   at org.eclipse.mylyn.internal.tasks.core.TaskRepositoryManager$1.propertyChange(TaskRepositoryManager.java:77)
   at org.eclipse.mylyn.tasks.core.TaskRepository.notifyChangeListeners(TaskRepository.java:887)
   at org.eclipse.mylyn.tasks.core.TaskRepository.setProperty(TaskRepository.java:880)
   at org.eclipse.mylyn.tasks.core.TaskRepository.setRepositoryLabel(TaskRepository.java:864)
   at org.netbeans.modules.jira.repository.JiraRepository.setupProperties(JiraRepository.java:484)
   at org.netbeans.modules.jira.repository.JiraRepository.setupTaskRepository(JiraRepository.java:470)
   at org.netbeans.modules.jira.repository.JiraRepository.<init>(JiraRepository.java:144)
   at org.netbeans.modules.jira.JiraConnector.createRepository(JiraConnector.java:88)
   at org.netbeans.modules.bugtracking.DelegatingConnector.createRepository(DelegatingConnector.java:131)
   at org.netbeans.modules.bugtracking.RepositoryRegistry.getStoredRepositories(RepositoryRegistry.java:277)
   at org.netbeans.modules.bugtracking.RepositoryRegistry.getRepositories(RepositoryRegistry.java:113)
   at org.netbeans.modules.bugtracking.RepositoryRegistry.getKnownRepositories(RepositoryRegistry.java:142)
   at org.netbeans.modules.bugtracking.tasks.DashboardUtils.getRepositories(DashboardUtils.java:328)
   at org.netbeans.modules.bugtracking.tasks.dashboard.DashboardViewer.loadRepositories(DashboardViewer.java:1170)
   at org.netbeans.modules.bugtracking.tasks.dashboard.DashboardViewer.access$900(DashboardViewer.java:99)
   at org.netbeans.modules.bugtracking.tasks.dashboard.DashboardViewer$14$1.call(DashboardViewer.java:908)
   at org.netbeans.modules.bugtracking.tasks.dashboard.DashboardViewer$14$1.call(DashboardViewer.java:905)
   at org.netbeans.modules.team.ide.ProjectServicesImpl.runAfterProjectOpenFinished(ProjectServicesImpl.java:169)
   at org.netbeans.modules.bugtracking.tasks.dashboard.DashboardViewer$14.run(DashboardViewer.java:922)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1423)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033)