title: Unable to setup Jenkins war with java command
body: <p>I am trying to setup Jenkins on first step I got following error
  when running the command "java -jar jenkins.war"</p>
  
  <pre><code>SEVERE: Running with Java class version 55.0, but 52.0 is required.Run with the --enable-future-java flag to enable such behavior. See https://jenkins.io/redirect/java-support/
  java.lang.UnsupportedClassVersionError: 55.0
      at Main.main(Main.java:139)
  
  Jenkins requires Java 8, but you are running 11.0.1+13-LTS from /Library/Java/JavaVirtualMachines/jdk-11.0.1.jdk/Contents/Home
  java.lang.UnsupportedClassVersionError: 55.0
      at Main.main(Main.java:139)
  </code></pre>
  
  <p>Can any one guild me how to fix this?</p>