What caused the java.lang.InternalError (it extends VirtualMachineError)

[spylady]

When I tried to do SVN synchronize I got this error. I wonder why it has happen, any ideas? It works great after restarting eclipse, but I wonder what could cause it and how its possible that the jar was not found. \[code\]!ENTRY org.eclipse.team.svn.core.svnnature 4 0 2011-12-09 14:22:15.534!MESSAGE SVN: '0x00000107: Synchronizing' operation finished with error!SUBENTRY 1 org.eclipse.team.svn.core.svnnature 4 0 2011-12-09 14:22:15.534!MESSAGE Synchronize operation failed.!STACK 0java.lang.InternalError at sun.misc.URLClassPath$JarLoader.getResource(URLClassPath.java:755) at sun.misc.URLClassPath.getResource(URLClassPath.java:169) at sun.misc.URLClassPath.getResource(URLClassPath.java:221) at java.lang.ClassLoader.getBootstrapResource(ClassLoader.java:1151) at java.lang.ClassLoader.getResource(ClassLoader.java:1000) at java.lang.ClassLoader.getResource(ClassLoader.java:998) at java.lang.ClassLoader.getSystemResource(ClassLoader.java:1101) at javax.crypto.SunJCE_b.i(DashoA13*..) at javax.crypto.SunJCE_b.g(DashoA13*..) at javax.crypto.SunJCE_b$1.run(DashoA13*..) at java.security.AccessController.doPrivileged(Native Method) at javax.crypto.SunJCE_b.<clinit>(DashoA13*..) at javax.crypto.KeyAgreement.getInstance(DashoA13*..) at com.sun.net.ssl.internal.ssl.JsseJce.getKeyAgreement(JsseJce.java:241) at com.sun.net.ssl.internal.ssl.JsseJce.isEcAvailable(JsseJce.java:158) at com.sun.net.ssl.internal.ssl.CipherSuite$KeyExchange.isAvailable(CipherSuite.java:271) at com.sun.net.ssl.internal.ssl.CipherSuite.isAvailable(CipherSuite.java:143) at com.sun.net.ssl.internal.ssl.CipherSuiteList.buildAvailableCache(CipherSuiteList.java:210) at com.sun.net.ssl.internal.ssl.CipherSuiteList.getDefault(CipherSuiteList.java:233) at com.sun.net.ssl.internal.ssl.SSLSocketImpl.init(SSLSocketImpl.java:508) at com.sun.net.ssl.internal.ssl.SSLSocketImpl.<init>(SSLSocketImpl.java:451) at com.sun.net.ssl.internal.ssl.SSLSocketFactoryImpl.createSocket(SSLSocketFactoryImpl.java:56) at org.tmatesoft.svn.core.internal.util.SVNSocketFactory.createSSLSocket(SVNSocketFactory.java:73) at org.tmatesoft.svn.core.internal.io.dav.http.HTTPConnection.connect(HTTPConnection.java:186) at org.tmatesoft.svn.core.internal.io.dav.http.HTTPConnection.request(HTTPConnection.java:327) at org.tmatesoft.svn.core.internal.io.dav.http.HTTPConnection.request(HTTPConnection.java:275) at org.tmatesoft.svn.core.internal.io.dav.http.HTTPConnection.request(HTTPConnection.java:263) at org.tmatesoft.svn.core.internal.io.dav.DAVConnection.exchangeCapabilities(DAVConnection.java:516) at org.tmatesoft.svn.core.internal.io.dav.DAVConnection.open(DAVConnection.java:98) at org.tmatesoft.svn.core.internal.io.dav.DAVRepository.openConnection(DAVRepository.java:999) at org.tmatesoft.svn.core.internal.io.dav.DAVRepository.getRepositoryUUID(DAVRepository.java:146) at org.tmatesoft.svn.core.wc.SVNBasicClient.createRepository(SVNBasicClient.java:342) at org.tmatesoft.svn.core.wc.SVNBasicClient.createRepository(SVNBasicClient.java:330) at org.tmatesoft.svn.core.wc.SVNStatusClient.doStatus(SVNStatusClient.java:338) at org.tmatesoft.svn.core.javahl.SVNClientImpl.status(SVNClientImpl.java:300) at org.tmatesoft.svn.core.javahl.SVNClientImpl.status(SVNClientImpl.java:282) at org.polarion.team.svn.connector.svnkit.SVNKitConnector.status(SVNKitConnector.java:341) at org.eclipse.team.svn.core.extension.factory.ThreadNameModifier.status(ThreadNameModifier.java:608) at org.eclipse.team.svn.core.operation.local.RemoteStatusOperation$2.run(RemoteStatusOperation.java:147) at org.eclipse.team.svn.core.utility.ProgressMonitorUtility.doSubTask(ProgressMonitorUtility.java:118) at org.eclipse.team.svn.core.operation.AbstractActionOperation.protectStep(AbstractActionOperation.java:154) at org.eclipse.team.svn.core.operation.AbstractActionOperation.protectStep(AbstractActionOperation.java:149) at org.eclipse.team.svn.core.operation.local.RemoteStatusOperation.runImpl(RemoteStatusOperation.java:145) at org.eclipse.team.svn.core.operation.AbstractActionOperation.run(AbstractActionOperation.java:81) at org.eclipse.team.svn.core.utility.ProgressMonitorUtility.doTask(ProgressMonitorUtility.java:104) at org.eclipse.team.svn.core.operation.CompositeOperation.runImpl(CompositeOperation.java:95) at org.eclipse.team.svn.core.operation.AbstractActionOperation.run(AbstractActionOperation.java:81) at org.eclipse.team.svn.core.operation.LoggedOperation.run(LoggedOperation.java:39) at org.eclipse.team.svn.core.utility.ProgressMonitorUtility.doTask(ProgressMonitorUtility.java:104) at org.eclipse.team.svn.core.utility.ProgressMonitorUtility.doTaskExternal(ProgressMonitorUtility.java:90) at org.eclipse.team.svn.core.synchronize.AbstractSVNSubscriber.findChanges(AbstractSVNSubscriber.java:314) at org.eclipse.team.svn.core.synchronize.AbstractSVNSubscriber$UpdateStatusOperation$2.run(AbstractSVNSubscriber.java:349) at org.eclipse.team.svn.core.utility.ProgressMonitorUtility.doSubTask(ProgressMonitorUtility.java:118) at org.eclipse.team.svn.core.operation.AbstractActionOperation.protectStep(AbstractActionOperation.java:154) at org.eclipse.team.svn.core.operation.AbstractActionOperation.protectStep(AbstractActionOperation.java:149) at org.eclipse.team.svn.core.synchronize.AbstractSVNSubscriber$UpdateStatusOperation.runImpl(AbstractSVNSubscriber.java:347) at org.eclipse.team.svn.core.operation.AbstractActionOperation.run(AbstractActionOperation.java:81) at org.eclipse.team.svn.core.operation.LoggedOperation.run(LoggedOperation.java:39) at org.eclipse.team.svn.core.utility.ProgressMonitorUtility.doTask(ProgressMonitorUtility.java:104) at org.eclipse.team.svn.core.utility.ProgressMonitorUtility.doTaskExternal(ProgressMonitorUtility.java:90) at org.eclipse.team.svn.core.utility.ProgressMonitorUtility.doTaskExternal(ProgressMonitorUtility.java:81) at org.eclipse.team.svn.core.synchronize.AbstractSVNSubscriber.refresh(AbstractSVNSubscriber.java:186) at org.eclipse.team.svn.core.synchronize.UpdateSubscriber.refresh(UpdateSubscriber.java:73) at org.eclipse.team.core.subscribers.Subscriber.refresh(Subscriber.java:466) at org.eclipse.team.core.subscribers.SubscriberMergeContext.refresh(SubscriberMergeContext.java:85) at org.eclipse.team.core.mapping.provider.SynchronizationContext.refresh(SynchronizationContext.java:109) at org.eclipse.team.internal.ui.synchronize.RefreshModelParticipantJob.doRefresh(RefreshModelParticipantJob.java:69) at org.eclipse.team.internal.ui.synchronize.RefreshParticipantJob.run(RefreshParticipantJob.java:309) at org.eclipse.team.internal.ui.synchronize.RefreshModelParticipantJob.run(RefreshModelParticipantJob.java:117) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)Caused by: java.io.FileNotFoundException: /usr/lib/jvm/java-6-sun-1.6.0.20/jre/lib/jce.jar at sun.misc.URLClassPath$JarLoader.getJarFile(URLClassPath.java:644) at sun.misc.URLClassPath$JarLoader.access$600(URLClassPath.java:540) at sun.misc.URLClassPath$JarLoader$1.run(URLClassPath.java:607) at java.security.AccessController.doPrivileged(Native Method) at sun.misc.URLClassPath$JarLoader.ensureOpen(URLClassPath.java:599) at sun.misc.URLClassPath$JarLoader.getResource(URLClassPath.java:753) ... 69 more\[/code\]no, it always works. just one time it did not.