title: Launching Plugin Fails, Missing Constraint javax.xml.bind
body: <p>I am writing an Eclipse plugin using Eclipse RCP (Kepler). Everything was working fine until last night all the sudden I started getting null pointer exceptions when trying to test my plugin. Here is a snippit of the stacktrace:</p>
  
  <pre><code>!ENTRY org.eclipse.ui.workbench 4 2 2013-08-24 08:36:17.616
  !MESSAGE Problems occurred when invoking code from plug-in: "org.eclipse.ui.workbench".
  !STACK 0
  java.lang.NullPointerException
  at org.eclipse.equinox.internal.p2.ui.sdk.scheduler.migration.MigrationSupport.getLastMigration(MigrationSupport.java:229)
  at org.eclipse.equinox.internal.p2.ui.sdk.scheduler.migration.MigrationSupport.baseChangedSinceLastPresentationOfWizard(MigrationSupport.java:190)
  at org.eclipse.equinox.internal.p2.ui.sdk.scheduler.migration.MigrationSupport.performMigration(MigrationSupport.java:69)
  at org.eclipse.equinox.internal.p2.ui.sdk.scheduler.AutomaticUpdateScheduler.earlyStartup(AutomaticUpdateScheduler.java:89)
  at org.eclipse.ui.internal.EarlyStartupRunnable.runEarlyStartup(EarlyStartupRunnable.java:87)
  at org.eclipse.ui.internal.EarlyStartupRunnable.run(EarlyStartupRunnable.java:66)
  at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
  at org.eclipse.ui.internal.Workbench$55.run(Workbench.java:2552)
  at org.eclipse.core.internal.jobs.Worker.run(Worker.java:53)
  java.lang.NullPointerException
  at org.eclipse.core.internal.runtime.InternalPlatform.getLog(InternalPlatform.java:354)
  at org.eclipse.core.runtime.Plugin.getLog(Plugin.java:291)
  at org.eclipse.ui.internal.WorkbenchPlugin.log(WorkbenchPlugin.java:830)
  at org.eclipse.ui.statushandlers.StatusManager.logError(StatusManager.java:285)
  at org.eclipse.ui.statushandlers.StatusManager.handle(StatusManager.java:200)
  at org.eclipse.ui.statushandlers.StatusManager.handle(StatusManager.java:231)
  at org.eclipse.ui.statushandlers.StatusManager$StatusManagerLogListener.logging(StatusManager.java:305)
  at org.eclipse.core.internal.runtime.RuntimeLog.logToListeners(RuntimeLog.java:160)
  at org.eclipse.core.internal.runtime.PlatformLogWriter.logged(PlatformLogWriter.java:100)
  at org.eclipse.equinox.log.internal.ExtendedLogReaderServiceFactory.safeLogged(ExtendedLogReaderServiceFactory.java:86)
  at org.eclipse.equinox.log.internal.ExtendedLogReaderServiceFactory.logPrivileged(ExtendedLogReaderServiceFactory.java:205)
  at org.eclipse.equinox.log.internal.ExtendedLogReaderServiceFactory.log(ExtendedLogReaderServiceFactory.java:178)
  at org.eclipse.equinox.log.internal.ExtendedLogServiceFactory.log(ExtendedLogServiceFactory.java:65)
  at org.eclipse.equinox.log.internal.ExtendedLogServiceImpl.log(ExtendedLogServiceImpl.java:87)
  at org.eclipse.equinox.log.internal.LoggerImpl.log(LoggerImpl.java:54)
  at org.eclipse.core.internal.runtime.PlatformLogWriter.logging(PlatformLogWriter.java:43)
  at org.eclipse.core.internal.runtime.RuntimeLog.log(RuntimeLog.java:96)
  at org.eclipse.core.runtime.SafeRunner.handleException(SafeRunner.java:71)
  at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:44)
  at org.eclipse.ui.internal.Workbench$55.run(Workbench.java:2552)
  at org.eclipse.core.internal.jobs.Worker.run(Worker.java:53)
  </code></pre>
  
  <p>To try and figure out what might be going on I went to the launch configuration for my plugin and clicked "Validate Plug-ins" and get the following error:</p>
  
  <pre><code>org.apache.xmlrpc
      Missing Constraint: Import-package: javax.xml.bind; version="0.0.0"
  </code></pre>
  
  <p><img src="https://i.stack.imgur.com/kVTAO.png" alt="missing constraint"></p>
  
  <p>Could this be the reason why launching my plugin is failing? If so, how to I fix it?</p>
  
  <p>Thank you</p>