title: Do we need to compile JAR for JDK upgrade?
body: <p>For our java project, we use several JAR libraries. Some of the source code for the JAR libraries have been lost.</p>
  
  <p>We will be upgrading the JRE version soon, do you know if we need to recompile the JAR libraries for the new JRE version? Since we don't have the source, is there a 100% accurate decompiler?</p>