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java.lang.NullPointerException: 	at java.util.ArrayList.(ArrayList.java:164)	at org.eclipse.wst.server.core.internal.ResourceManager.getRuntimes(ResourceManager.java:737)	at org.eclipse.wst.server.core.ServerCore.getRuntimes(ServerCore.java:289)	at oracle.eclipse.tools.weblogic.upgrade.internal.WlsRuntimeWorkspaceUpgradeParticipant.check(WlsRuntimeWorkspaceUpgradeParticipant.java:60)	at oracle.eclipse.tools.common.upgrade.internal.UpgradeFrameworkImpl.initialize(UpgradeFrameworkImpl.java:135)	at oracle.eclipse.tools.common.upgrade.UpgradeFramework.initialize(UpgradeFramework.java:26)	at oracle.eclipse.tools.common.upgrade.internal.StartupHandler.earlyStartup(StartupHandler.java:18)	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)