Java堆转储错误元数据似乎不是多态的[英] Java Heap Dump error - Metadata does not appear to be polymorphic

问题描述

我在尝试从正在运行的 Java 进程中获取堆转储时收到此 Stacktrace.是什么原因造成的,我必须做些什么才能进行正确的堆转储?

Dumping heap to dump.bin ...
Exception in thread "main" java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)
    at sun.tools.jmap.JMap.runTool(JMap.java:201)
    at sun.tools.jmap.JMap.main(JMap.java:130)
Caused by: java.lang.InternalError: Metadata does not appear to be polymorphic
    at sun.jvm.hotspot.types.basic.BasicTypeDataBase.findDynamicTypeForAddress(BasicTypeDataBase.java:278)
    at sun.jvm.hotspot.runtime.VirtualBaseConstructor.instantiateWrapperFor(VirtualBaseConstructor.java:102)
    at sun.jvm.hotspot.oops.Metadata.instantiateWrapperFor(Metadata.java:68)
    at sun.jvm.hotspot.memory.DictionaryEntry.klass(DictionaryEntry.java:71)
    at sun.jvm.hotspot.memory.Dictionary.classesDo(Dictionary.java:66)
    at sun.jvm.hotspot.memory.SystemDictionary.classesDo(SystemDictionary.java:190)
    at sun.jvm.hotspot.memory.SystemDictionary.allClassesDo(SystemDictionary.java:183)
    at sun.jvm.hotspot.utilities.HeapHprofBinWriter.writeClasses(HeapHprofBinWriter.java:942)
    at sun.jvm.hotspot.utilities.HeapHprofBinWriter.write(HeapHprofBinWriter.java:427)
    at sun.jvm.hotspot.tools.HeapDumper.run(HeapDumper.java:62)
    at sun.jvm.hotspot.tools.Tool.startInternal(Tool.java:260)
    at sun.jvm.hotspot.tools.Tool.start(Tool.java:223)
    at sun.jvm.hotspot.tools.Tool.execute(Tool.java:118)
    at sun.jvm.hotspot.tools.HeapDumper.main(HeapDumper.java:83)
    ... 6 more

环境:CentOS 64 位,Java OpenJDK 运行环境(build 1.8.0_31-b13)OpenJDK 64-Bit Server VM(build 25.31-b07,混合模式)

使用 ps 来查看使用的 java 版本:

/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.31-1.b13.el6_6.x86_64/jre/bin/java

我的第一次尝试是:

/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.31-1.b13.el6_6.x86_64/bin/jmap  -dump:format=b,file=dump.bin 14984

这让我着迷:

14984: Unable to open socket file: target process not responding or HotSpot VM not loaded
The -F option can be used when the target process is not responding

所以我用 -F 选项运行

/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.31-1.b13.el6_6.x86_64/bin/jmap -F -dump:format=b,file=dump.bin 14984

推荐答案

好的,我找到了.

我以 root 身份运行 jmap 命令,但我必须以启动 java 进程的用户身份运行.

就我而言:

sudo -u robau ./jmap -dump:format=b,file=/tmp/dump.bin 14984

似乎与这个JDK bug有关:https://bugs.openjdk.java.net/browse/JDK-8075773

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