由于ReadVirtual失败,无法创建堆转储

Question

我们有一个在Java 6更新45中运行的JBoss应用程序服务器.我们遇到了我们最有可能自己介绍的OutOfMemoryErrors.我们想分析那些并想要创建堆转储.这失败,下面有例外.

谷歌搜索和搜索stackoverflow对我没有多大帮助,有没有人知道如何从这台机器获得堆转储？

谢谢!

马丁

例外是:

C:\>"d:\Program Files\Java\bin\"jmap -F "-dump:format=b,file=D:\heapdumps\20130620_085902_heap.dump" 1832
Attaching to process ID 1832, please wait...
Debugger attached successfully.
Server compiler detected.
JVM version is 20.45-b01
Dumping heap to D:\heapdumps\20130620_085902_heap.dump ...
Exception in thread "main" java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at sun.tools.jmap.JMap.runTool(JMap.java:179)
        at sun.tools.jmap.JMap.main(JMap.java:110)
Caused by: sun.jvm.hotspot.debugger.DebuggerException: Windbg Error: ReadVirtual failed!
        at sun.jvm.hotspot.debugger.windbg.WindbgDebuggerLocal.readBytesFromProcess0(Native Method)
        at sun.jvm.hotspot.debugger.windbg.WindbgDebuggerLocal.readBytesFromProcess(WindbgDebuggerLocal.java:485)
        at sun.jvm.hotspot.debugger.DebuggerBase$Fetcher.fetchPage(DebuggerBase.java:76)
        at sun.jvm.hotspot.debugger.PageCache.getPage(PageCache.java:178)
        at sun.jvm.hotspot.debugger.PageCache.getInt(PageCache.java:96)
        at sun.jvm.hotspot.debugger.DebuggerBase.readCInteger(DebuggerBase.java:355)
        at sun.jvm.hotspot.debugger.DebuggerBase.readCompOopAddressValue(DebuggerBase.java:459)
        at sun.jvm.hotspot.debugger.windbg.WindbgDebuggerLocal.readCompOopHandle(WindbgDebuggerLocal.java:332)
        at sun.jvm.hotspot.debugger.windbg.WindbgAddress.getCompOopHandleAt(WindbgAddress.java:122)
        at sun.jvm.hotspot.oops.Oop.getKlassForOopHandle(Oop.java:235)
        at sun.jvm.hotspot.oops.ObjectHeap.newOop(ObjectHeap.java:378)
        at sun.jvm.hotspot.oops.ObjectHeap.iterateLiveRegions(ObjectHeap.java:464)
        at sun.jvm.hotspot.oops.ObjectHeap.iterate(ObjectHeap.java:249)
        at sun.jvm.hotspot.utilities.AbstractHeapGraphWriter.write(AbstractHeapGraphWriter.java:51)
        at sun.jvm.hotspot.utilities.HeapHprofBinWriter.write(HeapHprofBinWriter.java:416)
        at sun.jvm.hotspot.tools.HeapDumper.run(HeapDumper.java:56)
        at sun.jvm.hotspot.tools.Tool.start(Tool.java:221)
        at sun.jvm.hotspot.tools.HeapDumper.main(HeapDumper.java:77)
        ... 6 more

Answer 1

嗯，在另一个网站上找到了答案，这似乎确实有效。现在，我们要求 JVM 在遇到 OutOfMemoryError 时使用以下选项进行堆转储：

-XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=./java_pid<pid>.hprof

如发现：

http://www.oracle.com/technetwork/java/javase/tech/vmoptions-jsp-140102.html