Jenkins容器安装ruby-runtime插件失败报错解决

报错信息：

java.lang.RuntimeException: unsupported Java version: 11
    at org.jruby.RubyInstanceConfig.initGlobalJavaVersion(RubyInstanceConfig.java:1674)
    at org.jruby.RubyInstanceConfig.<clinit>(RubyInstanceConfig.java:1387)
Caused: java.lang.ExceptionInInitializerError
    at org.jruby.embed.internal.AbstractLocalContextProvider.<init>(AbstractLocalContextProvider.java:42)
    at org.jruby.embed.internal.SingleThreadLocalContextProvider.<init>(SingleThreadLocalContextProvider.java:43)
    at org.jruby.embed.ScriptingContainer.getProviderInstance(ScriptingContainer.java:242)
    at org.jruby.embed.ScriptingContainer.<init>(ScriptingContainer.java:226)
    at org.jruby.embed.ScriptingContainer.<init>(ScriptingContainer.java:192)
    at org.kohsuke.stapler.jelly.jruby.JRubyFacet.<init>(JRubyFacet.java:65)
    at ruby.RubyRuntimePlugin.registerJRubyFacet(RubyRuntimePlugin.java:39)
    at ruby.RubyRuntimePlugin.start(RubyRuntimePlugin.java:30)
    at hudson.ClassicPluginStrategy.startPlugin(ClassicPluginStrategy.java:408)
    at hudson.ClassicPluginStrategy.load(ClassicPluginStrategy.java:397)
Caused: java.io.IOException: Failed to initialize
    at hudson.ClassicPluginStrategy.load(ClassicPluginStrategy.java:400)
    at hudson.PluginManager.dynamicLoad(PluginManager.java:922)
Caused: java.io.IOException: Failed to install ruby-runtime plugin
    at hudson.PluginManager.dynamicLoad(PluginManager.java:934)
    at hudson.model.UpdateCenter$InstallationJob._run(UpdateCenter.java:2183)
Caused: java.io.IOException: Failed to dynamically deploy this plugin
    at hudson.model.UpdateCenter$InstallationJob._run(UpdateCenter.java:2187)
    at hudson.model.UpdateCenter$DownloadJob.run(UpdateCenter.java:1850)
    at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
    at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
    at hudson.remoting.AtmostOneThreadExecutor$Worker.run(AtmostOneThreadExecutor.java:121)
    at java.base/java.lang.Thread.run(Thread.java:829)

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解决：

 从上面的报错信息分析可能是由于Jenkins容器中的Java 11版本过高。我们单独下载一个低版本的jdk，然后将低版本的jdk拷贝到Jenkins容器中替换掉之前的Java 11版本。

[[email protected] ~]# wget https://builds.openlogic.com/downloadJDK/openlogic-openjdk/8u262-b10/openlogic-openjdk-8u262-b10-linux-x64.tar.gz    //下载jdk8

[[email protected] ~]# ll openlogic-openjdk-8u262-b10-linux-x64.tar.gz
-rw-r--r-- 1 root root 104479130 7月  26 2020 openlogic-openjdk-8u262-b10-linux-x64.tar.gz

[[email protected] ~]# docker ps | grep jenkins
2324d2daa74d        jenkins/jenkins:lts                                 "/sbin/tini -- /usr/…"   6 weeks ago         Up 2 hours             0.0.0.0:8080->8080/tcp, 0.0.0.0:50000->50000/tcp   jenkins

[[email protected] ~]# docker cp openlogic-openjdk-8u262-b10-linux-x64.tar.gz jenkins:/usr/local/         //将下载的jdk拷贝到jenkins容器中

[[email protected] ~]# docker exec -it -u root jenkins /bin/bash     //进入jenkins容器
[email protected]:/# java -version       //可以看到现在jenkins容器的jdk版本是11.0.12
openjdk version "11.0.12" 2021-07-20
OpenJDK Runtime Environment Temurin-11.0.12+7 (build 11.0.12+7)
OpenJDK 64-Bit Server VM Temurin-11.0.12+7 (build 11.0.12+7, mixed mode)

[email protected]:/# cd /usr/local/

[email protected]:/usr/local# tar -xvf openlogic-openjdk-8u262-b10-linux-x64.tar.gz      //解压我们刚才拷贝到jenkins容器中的jdk低版本

[email protected]:/usr/local# ls
bin  games    lib  openlogic-openjdk-8u262-b10-linux-64          sbin   src
etc  include  man  openlogic-openjdk-8u262-b10-linux-x64.tar.gz  share

[email protected]:/usr/local# mv openlogic-openjdk-8u262-b10-linux-64/ jdk8        //将解压后的jdk低版本目录名称修改为jdk8

[email protected]:/usr/local# ls
bin  etc  games  include  jdk8  lib  man  openlogic-openjdk-8u262-b10-linux-x64.tar.gz  sbin  share  src

[email protected]:/usr/local# whereis java     //查看jenkins容器中的java安装位置
java: /opt/java/openjdk/bin/java

[email protected]:/usr/local# mv /opt/java/openjdk/bin/java /opt/java/openjdk/bin/java11.bak     //备份jenkins容器中的原java11版本

[email protected]:/usr/local# ln -s /usr/local/jdk8/bin/java /opt/java/openjdk/bin/java        //将/usr/local/jdk8/bin/中低版本的java作为/opt/java/openjdk/bin/中的java软连接

[email protected]:/usr/local# java -version    //查看“替换”后的java版本
openjdk version "1.8.0-262"
OpenJDK Runtime Environment (build 1.8.0-262-b10)
OpenJDK 64-Bit Server VM (build 25.71-b10, mixed mode)

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 再次安装ruby-runtime插件，若还是失败，可以在Jenkins首页重启一下再安装即可。（重启Jenkins后ruby-runtime插件默认就会加载成功）

 插件安装完成后我们再将Jenkins容器中的Java版本修改回来。（根据情况，也可以不改回来）

[email protected]:~# rm -rf /opt/java/openjdk/bin/java    #删除了之前替换的java8

[email protected]:~# mv /opt/java/openjdk/bin/java11.bak /opt/java/openjdk/bin/java    #换回了java11

[email protected]:~# java -version
openjdk version "11.0.12" 2021-07-20
OpenJDK Runtime Environment Temurin-11.0.12+7 (build 11.0.12+7)
OpenJDK 64-Bit Server VM Temurin-11.0.12+7 (build 11.0.12+7, mixed mode)

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