尝试从正在运行的
Java进程中获取堆转储时,我得到此StackTrace.是什么原因造成的,我必须做些什么来做一个正确的堆转储？
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(构建1.8.0_31-b13)OpenJDK 64位服务器虚拟机(构建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
我的第一个尝试是：
/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
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
解决方法
好的,我找到了
我以root身份运行jmap命令,但是我不得不以启动java进程的用户身份运行.
在我的情况下
sudo -u robau ./jmap -dump:format=b,file=/tmp/dump.bin 14984
似乎与这个JDK错误有关：
https://bugs.openjdk.java.net/browse/JDK-8075773
