是什么导致了java.lang.InternalError（它扩展了VirtualMachineError）

Question

当我尝试进行 SVN 同步时，出现此错误。我想知道为什么会发生这种情况，有什么想法吗？重新启动 eclipse 后效果很好，但我想知道是什么原因导致的，以及如何可能找不到 jar。

!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 0
java.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

不，它总是有效。只有一次没有。

Answer 1

查看sun.misc.URLClassPath和sun.misc.FileURLMapper，有代码在 FileURLMapper.exists() 中执行以下操作：

public boolean exists() {
    String path = getPath();
    File f = new File (path);
    return f.exists();
}

假设没有发生任何疯狂的事情，例如 jce.jar 文件实际上被删除（例如通过在 Eclipse 运行时升级 Java 版本），则 File.exists() 调用可能会失败，因为一些其他原因（可能内存不足/文件描述符？在 Unix 上 file.exists() 最终调用 stat/stat64 函数)

Answer 2

深入了解代码在这里找到了我能看到的东西：第 753 行调用 sun.misc.URLClassPath.JarLoader.ensureOpen() 导致InternalError 在 755。

该方法如下：

private void ensureOpen() throws IOException {
    if (jar == null) {
        try {
            java.security.AccessController.doPrivileged(new java.security.PrivilegedExceptionAction() {
                        public Object run() throws IOException {
                            ....
                        }
                    });
        } catch (java.security.PrivilegedActionException pae) {
            throw (IOException) pae.getException(); // this exception is thrown
        }
    }
}

这里 java.security.AccessController.doPrivileged(PrivilegedExceptionAction) 是一个本地方法。文档位于此处。

从文档中可以看出，抛出error可能是在处理public Object run() throws IOException {时发生的检查异常。

Answer 3

检查此文件

/usr/lib/jvm/java-6-sun-1.6.0.20/jre/lib/jce.jar

可能您的 Eclipse 尝试使用存储库进行身份验证，但缺少处理和执行身份验证所需的类。