jmap错误:unknown CollectedHeap type : class sun.jvm.hotspot.gc_interface.CollectedHeap

使用jmap -heap命令查看堆的详细信息报错

Caused by: java.lang.RuntimeException: unknown CollectedHeap type : class sun.jvm.hotspot.gc_interface.CollectedHeap

[root@bangbet-java ~]# jmap -heap27822Attaching to process ID 27822, pleasewait...

Debugger attached successfully.

Server compiler detected.

JVM version is 25.222-b10

using thread-localobject allocation.

Parallel GC with 4 thread(s)

Heap Configuration:

  MinHeapFreeRatio        =0  MaxHeapFreeRatio        =100  MaxHeapSize              =1073741824(1024.0MB)

  NewSize                  =536870912(512.0MB)

  MaxNewSize              =536870912(512.0MB)

  OldSize                  =536870912(512.0MB)

  NewRatio                =2  SurvivorRatio            =8  MetaspaceSize            =21807104(20.796875MB)

  CompressedClassSpaceSize =1073741824(1024.0MB)

  MaxMetaspaceSize        =17592186044415 MB

  G1HeapRegionSize        =0(0.0MB)

Heap Usage:

Exception inthread"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: java.lang.RuntimeException: unknown CollectedHeap type : class sun.jvm.hotspot.gc_interface.CollectedHeap

        at sun.jvm.hotspot.tools.HeapSummary.run(HeapSummary.java:157)

        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.HeapSummary.main(HeapSummary.java:50)

        ... 6more

奇怪,在本地是没问题的,在linux上却出现这种情况

查看了下jdk版本,都是1.8,没啥问题呀

本地是HotSpot

线上是OpenJDK

最终原因

这里-heap参数会调用用到了sun.jvm下的debug包,而默认openJDK的安装中不包含!

解决方式

下载并安装一个java-openjdk-debug插件!而且需要和openjdk小版本也一致!!!

安装debuginfo

去网站http://debuginfo.centos.org/7/x86_64里面找匹配当前的openjdk的版本,小版本号也要匹配上。

然后使用wget命令下载

wgethttp://debuginfo.centos.org/7/x86_64/java-1.8.0-openjdk-debuginfo-1.8.0.222.b10-0.el7_6.x86_64.rpm

使用rpm命令安装

rpm -ivh java-1.8.0-openjdk-debuginfo-1.8.0.222.b10-0.el7_6.x86_64.rpm

查看是否安装了debuginfo

[root@bangbet-java ~]# rpm -qa|grep debuginfo

java-1.8.0-openjdk-debuginfo-1.8.0.222.b10-0.el7_6.x86_64

再次查询

[root@bangbet-java ~]# jmap -heap27968Attaching to process ID 27968, pleasewait...

Debugger attached successfully.

Server compiler detected.

JVM version is 25.222-b10

using thread-localobject allocation.

Parallel GC with 4 thread(s)

Heap Configuration:

  MinHeapFreeRatio        =0  MaxHeapFreeRatio        =100  MaxHeapSize              =2147483648(2048.0MB)

  NewSize                  =1073741824(1024.0MB)

  MaxNewSize              =1073741824(1024.0MB)

  OldSize                  =1073741824(1024.0MB)

  NewRatio                =2  SurvivorRatio            =8  MetaspaceSize            =21807104(20.796875MB)

  CompressedClassSpaceSize =1073741824(1024.0MB)

  MaxMetaspaceSize        =17592186044415 MB

  G1HeapRegionSize        =0(0.0MB)

Heap Usage:

PS Young Generation

Eden Space:

  capacity =1054867456(1006.0MB)

  used    =521443544(497.28731536865234MB)

  free=533423912(508.71268463134766MB)

  49.43213870463741% used

From Space:

  capacity =8388608(8.0MB)

  used    =8377312(7.989227294921875MB)

  free=11296(0.010772705078125MB)

  99.86534118652344% used

To Space:

  capacity =9437184(9.0MB)

  used    =0(0.0MB)

  free=9437184(9.0MB)

  0.0% used

PS Old Generation

  capacity =1073741824(1024.0MB)

  used    =334280072(318.79431915283203MB)

  free=739461752(705.205680847168MB)

  31.132257729768753% used35880interned Strings occupying4018400bytes.

ok,解决完毕!

遇到的版本问题

我的jdk版本是1.8.0_222-b10,在http://debuginfo.centos.org/7/x86_64找到两个

先下载了个最新的发现并不好使,之后卸载重新下载另一个

rpm卸载

rpm -e --nodeps java-1.8.0-openjdk-debuginfo-1:1.8.0.222.b10-1.el7_7.x86_64

之后重新安装即可

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