openJDK无法进行jmap

喜欢ヅ旅行 2022-04-03 02:01 656阅读 0赞

一、首先观察openJDK的的版本

java -version

二、查看openJDK有jmap的yum源

yum whatprovides '*/jmap'

三、选择记得相关的版本进行更新

1:java-1.6.0-openjdk-devel-1.6.0.37-1.13.9.4.el7_1.x86_64 : OpenJDK Development Environment
    Repo        : updates
    Matched from:
    Filename    : /usr/lib/jvm/java-1.6.0-openjdk-1.6.0.37.x86_64/bin/jmap
    
    1:java-1.7.0-openjdk-devel-1.7.0.91-2.6.2.3.el7.x86_64 : OpenJDK Development Environment
    Repo        : base
    Matched from:
    Filename    : /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.91-2.6.2.3.el7.x86_64/bin/jmap
    
    1:java-1.8.0-openjdk-devel-1.8.0.65-3.b17.el7.x86_64 : OpenJDK Development Environment
    Repo        : base
    Matched from:
    Filename    : /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.65-3.b17.el7.x86_64/bin/jmap
    
    1:java-1.8.0-openjdk-devel-debug-1.8.0.65-3.b17.el7.x86_64 : OpenJDK Development Environment with full debug on
    Repo        : base
    Matched from:
    Filename    : /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.65-3.b17.el7.x86_64-debug/bin/jmap
    
    1:java-1.8.0-openjdk-devel-debug-1.8.0.65-3.b17.el7.x86_64 : OpenJDK Development Environment with full debug on
    Repo        : @base
    Matched from:
    Filename    : /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.65-3.b17.el7.x86_64-debug/bin/jmap

选择此版本  
1:`java-1.8.0-openjdk-devel-debug-1.8.0.65-3.b17.el7.x86_64` : OpenJDK Development Environment with full debug on  
Repo : base  
Matched from:  
Filename : /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.65-3.b17.el7.x86\_64-debug/bin/jmap  
拷贝加红的jdk进行更新  
四、更新jdk、但是有关于JDK服务、需要重新启动。记住必须用root进行更新

yum install java-1.8.0-openjdk-devel-debug-1.8.0.65-3.b17.el7.x86_64

五、进行jmap、jstack、jps操作

jmap -dump:format=b,file=/home/admin/heap.hprof pid 
    pid 是程序的进程号 ps -ef|grep java 就可以查看到
    jstack  pid > thread.txt
    jmap -dump:live,format=b,file=heapLive.hprof pid

如果无法dump 说明权限不够不能写入。