Java堆转储错误 - 元数据似乎不是多态的

Question

在尝试从正在运行的Java进程中获取堆转储时,我得到了这个Stacktrace.导致这种情况的原因以及如何进行正确的堆转储？

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运行时环境(内置1.8.0_31-b13)OpenJDK 64位服务器VM(内置25.31-b07,混合模式)

Usign ps看到所使用的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:

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

所以我跑了-F选项

/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

Answer 1

好的,我找到了.

我正在运行该jmap命令root,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错误有关:https: //bugs.openjdk.java.net/browse/JDK-8075773

Answer 2

尝试在AWS ElasticBeanstalk实例上运行jmap时遇到了同样的问题.修复它的命令是

sudo debuginfo-install java-1.8.0-openjdk-devel

BTW,jmap使用命令安装在AWS ElasticBeanstalk实例上

sudo yum install java-1.8.0-openjdk-devel-1.8.0.91-0.b14.10.amzn1.x86_64

Answer 3

即使作为启动该过程的用户运行,我在CentOS上也遇到了这个问题.为我解决的是安装与提供jmap实用程序的包相对应的debuginfo包.

要安装debuginfo包,请参阅此答案(将您的java包替换为glibc).它需要获取/使用debuginfo-install实用程序,并确保正确设置CentOS-Debuginfo.repo并启用它.

Answer 4

在 Ubuntu 上，我通过安装 openjdk-dbg 包解决了这个问题：

sudo apt-get install openjdk-8-dbg

我现在怀疑这通过将 jdk 升级到纠正错误的版本间接解决了我的问题。您也许可以通过以下方式解决此问题：

 sudo apt-get install openjdk-8

注意： java升级后，必须重新启动java进程才能获得正确的转储。如果你不这样做，你会得到这样的结果：

Attaching to process ID 21957, please wait...
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:498)
    at sun.tools.jmap.JMap.runTool(JMap.java:201)
    at sun.tools.jmap.JMap.main(JMap.java:130)
Caused by: sun.jvm.hotspot.debugger.UnmappedAddressException: 7f21453c9bf8
    at sun.jvm.hotspot.debugger.PageCache.checkPage(PageCache.java:208)
    at sun.jvm.hotspot.debugger.PageCache.getData(PageCache.java:63)
    at sun.jvm.hotspot.debugger.DebuggerBase.readBytes(DebuggerBase.java:225)
    at sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal.readCInteger(LinuxDebuggerLocal.java:498)
    at sun.jvm.hotspot.debugger.linux.LinuxAddress.getCIntegerAt(LinuxAddress.java:69)
    at sun.jvm.hotspot.HotSpotTypeDataBase.getLongValueFromProcess(HotSpotTypeDataBase.java:604)
    at sun.jvm.hotspot.HotSpotTypeDataBase.readVMTypes(HotSpotTypeDataBase.java:164)
    at sun.jvm.hotspot.HotSpotTypeDataBase.<init>(HotSpotTypeDataBase.java:89)
    at sun.jvm.hotspot.HotSpotAgent.setupVM(HotSpotAgent.java:395)
    at sun.jvm.hotspot.HotSpotAgent.go(HotSpotAgent.java:305)
    at sun.jvm.hotspot.HotSpotAgent.attach(HotSpotAgent.java:140)
    at sun.jvm.hotspot.tools.Tool.start(Tool.java:185)
    at sun.jvm.hotspot.tools.Tool.execute(Tool.java:118)
    at sun.jvm.hotspot.tools.HeapDumper.main(HeapDumper.java:83)
    ... 6 more