VMVersionMismatchException异常处理过程

VMVersionMismatchException异常处理过程

解决方案：移除linux上所有安装的jdk，重装jdk

以下记录发现问题和解决问题的过程：

1. curl 调用接口，出现

Failed connect to localhost:8084; Connection refused

2. jps 查看pid 44995

3. jstack -l 44995

jvm垃圾回收线程一直被占用

4. jmap -heap 44995

报出异常
```
Attaching to process ID 44995, please wait...
Error attaching to process: sun.jvm.hotspot.runtime.VMVersionMismatchException: Supported versions are 25.131-b11. Target VM is 25.161-b14
sun.jvm.hotspot.debugger.DebuggerException: sun.jvm.hotspot.runtime.VMVersionMismatchException: Supported versions are 25.131-b11. Target VM is 25.161-b14
        at sun.jvm.hotspot.HotSpotAgent.setupVM(HotSpotAgent.java:435)
        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.HeapSummary.main(HeapSummary.java:49)
        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.runtime.VMVersionMismatchException: Supported versions are 25.131-b11. Target VM is 25.161-b14
        at sun.jvm.hotspot.runtime.VM.checkVMVersion(VM.java:227)
        at sun.jvm.hotspot.runtime.VM.(VM.java:294)
        at sun.jvm.hotspot.runtime.VM.initialize(VM.java:370)
        at sun.jvm.hotspot.HotSpotAgent.setupVM(HotSpotAgent.java:431)
```

5. jinfo 44995

仍报出上述错误

6. java -v

```
Unrecognized option: -v
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.
```

7. 查找网上

JVM version不匹配。系统中有多个JDK安装。


8. 进入/usr/bin
执行 jmap -heap 44995
```
Attaching to process ID 44995, please wait...
Error attaching to process: sun.jvm.hotspot.debugger.DebuggerException: cannot open binary file
sun.jvm.hotspot.debugger.DebuggerException: sun.jvm.hotspot.debugger.DebuggerException: cannot open binary file
        at sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal$LinuxDebuggerLocalWorkerThread.execute(LinuxDebuggerLocal.java:163)
        at sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal.attach(LinuxDebuggerLocal.java:278)
        at sun.jvm.hotspot.HotSpotAgent.attachDebugger(HotSpotAgent.java:671)
        at sun.jvm.hotspot.HotSpotAgent.setupDebuggerLinux(HotSpotAgent.java:611)
        at sun.jvm.hotspot.HotSpotAgent.setupDebugger(HotSpotAgent.java:337)
        at sun.jvm.hotspot.HotSpotAgent.go(HotSpotAgent.java:304)
        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.PMap.main(PMap.java:72)
        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.DebuggerException: cannot open binary file
        at sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal.attach0(Native Method)
        at sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal.access$100(LinuxDebuggerLocal.java:62)
        at sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal$1AttachTask.doit(LinuxDebuggerLocal.java:269)
        at sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal$LinuxDebuggerLocalWorkerThread.run(LinuxDebuggerLocal.java:138)
```

9. 查看安装的jdk
rpm -qa | grep jdk
rpm -qa | grep java 
rpm -qa | grep gcj


```
[root@10 java]# rpm -qa | grep jdk
jdk1.8.0_131-1.8.0_131-fcs.x86_64
... ...
```

10. 移除所有的jdk
rpm -e --nodeps jdk1.8.0_131-1.8.0_131-fcs.x86_64

11. 下载并安装jdk
 wget --no-check-certificate --no-cookies --header "Cookie: oraclelicense=accept-securebackup-cookie" http://download.oracle.com/otn-pub/java/jdk/8u161-b12/2f38c3b165be4555a1fa6e98c45e0808/jdk-8u161-linux-x64.rpm
  rpm -ivh dk-8u161-linux-x64.rpm
  
12. 系统变量设置
vi /etc/profile
添加
JAVA_HOME=/usr/java/jdk1.8.0_161
JRE_HOME=/usr/java/jdkjdk1.8.0_161/jre
CLASS_PATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib
PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin
export JAVA_HOME JRE_HOME CLASS_PATH PATH


保存，退出
source /etc/profile 


13. 重启原有的可执行的jar包