Jmap 无法连接进行转储 [英] Jmap can't connect to make a dump

问题描述

我们有一个应用程序的公开测试版，它偶尔会导致堆空间溢出.JVM 的反应是永久休假.

We have an open beta of an app which occasionally causes the heapspace to overflow. The JVM reacts by going on a permanent vacation.

为了分析这一点，我想看看内存失败的地方.Java 不希望我这样做.该进程仍在内存中，但似乎没有被识别为 java 进程.

To analyze this I would like to peek into the memory at the point where it failed. Java does not want me to do this. The process is still in memory but it doesn't seem to be recognized as a java process.

有问题的服务器是 debian Lenny 服务器，Java 6u14

The server in question is a debian Lenny server, Java 6u14

/opt/jdk/bin# ./jmap -F -dump:format=b,file=/tmp/apidump.hprof 11175
Attaching to process ID 11175, please wait...
sun.jvm.hotspot.debugger.NoSuchSymbolException: Could not find symbol "gHotSpotVMTypeEntryTypeNameOffset" in any of the known library names (libjvm.so, libjvm_g.so, gamma_g)
at sun.jvm.hotspot.HotSpotTypeDataBase.lookupInProcess(HotSpotTypeDataBase.java:390)
at sun.jvm.hotspot.HotSpotTypeDataBase.getLongValueFromProcess(HotSpotTypeDataBase.java:371)
at sun.jvm.hotspot.HotSpotTypeDataBase.readVMTypes(HotSpotTypeDataBase.java:102)
at sun.jvm.hotspot.HotSpotTypeDataBase.<init>(HotSpotTypeDataBase.java:85)
at sun.jvm.hotspot.bugspot.BugSpotAgent.setupVM(BugSpotAgent.java:568)
at sun.jvm.hotspot.bugspot.BugSpotAgent.go(BugSpotAgent.java:494)
at sun.jvm.hotspot.bugspot.BugSpotAgent.attach(BugSpotAgent.java:332)
at sun.jvm.hotspot.tools.Tool.start(Tool.java:163)
at sun.jvm.hotspot.tools.HeapDumper.main(HeapDumper.java:77)
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)
Debugger attached successfully.
sun.jvm.hotspot.tools.HeapDumper requires a java VM process/core!

推荐答案

解决方案非常简单.我以 root 身份运行 jmap，但我必须以启动 jvm 的用户身份运行它.我现在要羞愧地把头藏起来.

The solution was very simple. I was running the jmap as root, but I had to run it as the user who started the jvm. I will now go hide my head in shame.

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