Trying the installation Sonarqube Plugin failing on Jenkins Version 2.19.2 
& 2.30 raised bug on it https://issues.jenkins-ci.org/browse/INFRA-975.



SonarQube Plugin 
Failure - 

java.io.IOException: Failed to dynamically deploy this plugin
        at 
hudson.model.UpdateCenter$InstallationJob._run(UpdateCenter.java:1383)
        at hudson.model.UpdateCenter$DownloadJob.run(UpdateCenter.java:1161)
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
        at java.util.concurrent.FutureTask.run(FutureTask.java:262)
        at 
hudson.remoting.AtmostOneThreadExecutor$Worker.run(AtmostOneThreadExecutor.java:110)
        at java.lang.Thread.run(Thread.java:745)
Caused by: java.io.IOException: Failed to install sonar plugin
        at hudson.PluginManager.dynamicLoad(PluginManager.java:508)
        at 
hudson.model.UpdateCenter$InstallationJob._run(UpdateCenter.java:1379)
        ... 5 more
Caused by: java.io.IOException: Unable to load hudson.plugins.sonar.SonarPlugin 
from sonar
        at hudson.ClassicPluginStrategy.load(ClassicPluginStrategy.java:425)
        at hudson.PluginManager.dynamicLoad(PluginManager.java:499)
        ... 6 more
Caused by: java.lang.UnsupportedClassVersionError: 
hudson/plugins/sonar/SonarPlugin : Unsupported major.minor version 52.0
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:803)
        at 
jenkins.util.AntClassLoader.defineClassFromData(AntClassLoader.java:1139)
        at 
hudson.ClassicPluginStrategy$AntClassLoader2.defineClassFromData(ClassicPluginStrategy.java:802)
        at 
jenkins.util.AntClassLoader.getClassFromStream(AntClassLoader.java:1310)
        at 
jenkins.util.AntClassLoader.findClassInComponents(AntClassLoader.java:1366)
        at jenkins.util.AntClassLoader.findClass(AntClassLoader.java:1326)
        at jenkins.util.AntClassLoader.loadClass(AntClassLoader.java:1079)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
        at hudson.ClassicPluginStrategy.load(ClassicPluginStrategy.java:418)

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