How to fix UnsupportedClassVersionError: Class has been compiled by a more recent version of the Java Runtime May 11th, 2019 by App Shah 10Today after installing Java 12 on my laptop, I started seeing some issue about compiler version mismatch. In this tutorial we will go over steps on how to fix these …Read Article about How to fix UnsupportedClassVersionError: Class has been compiled by a more recent version of the Java Runtime →