Class has been compiled by a more recent version of the Java Environment

Question

While running selenium script  I am getting the following error message in Eclipse console      Class has been compiled by a more recent version of the Java Environment  class file version 53 0   this version of the Java Runtime only recognizes class file versions up to 52 0       Java Version  8 IDE  Eclipse Oxygen Firefox Version  46

User · Answer

I had a similar issue from the console after building a Jar in Intellij. Using the Java configuration to update to a newer version (Windows -> Configure Java -> Update -> Update Now) didn't work and stuck at version 1.8 (Java 8).

To switch to a more recent version locally I had to install the Java 15 JDK from https://www.oracle.com/uk/java/technologies/javase-jdk15-downloads.html and add that to my Java runtime environment settings.

User · Answer

IDE  Eclipse Oxygen 3  To temporarily correct the problem do the following   Project menu   Properties   Java Compiler   Compiler compliance level   1 8  A permanent fix likely involves installing JDK 9   FYI 1 8 is what Java 8 is called   Side bar  I recently returned to Java after a foray into C   a breath of fresh air  and installed Eclipse Oxygen onto a clean system that had never had Java installed on it before  This default everything with a brand new install of Eclipse Oxygen yet somehow or other Eclipse can t get its own parameters to match the jdk that s installed  This is the second project I created and the second time I ran into this headache  Time to go back to C    Related Question  has been compiled by a more recent version of the Java Runtime  class file version 53 0

User · Answer

I m writing this because I found the other answers hard to understand    Essentially your JRE is not updated and or Eclipse is not configured to use the most recent JRE    On Windows  go to Control Panel -  Programs -  Java -  update and proceed to update java  or if you don t have Java  go to Oracle s website and download the most recent JRE   Once this is done  go into eclipse  and under the project view  right click on your project  select Java Build Path  double click on JRE System Library  then Select Workspace Default JRE 14 1   If a recent version of Java doesn t show up here  it probably isn t installed  Check you JRE NOT JDK  version and make sure it s recent  If it is  try restarting the computer then trying this again

User · Answer

Go to Project section  click on properties   then to Java compiler   check compiler compliance level is 1 8   or there should be no yellow warning at bottom

User · Answer

This is just a version mismatch  You have compiled your code using java version 9 and your current JRE is version 8  Try upgrading your JRE to 9   49   Java 5 50   Java 6 51   Java 7 52   Java 8 53   Java 9 54   Java 10 55   Java 11 56   Java 12 57   Java 13 58   Java 14

User · Answer

Your JDK version  Java 8 Your JRE version  Java 9 Here your JRE version is different than the JDK version that s the case  Here you can compile all the java classes using JDK version 1 8  If you want to compile only one java class just change the   java into  lt yourclassname gt  java javac -source 1 8 -target 1 8    java  source  The version that your source code requires to compile  target  The oldest JRE version you want to support

User · Answer

You can try this way  javac --release 8 yourClass java

User · Answer

Refreshing gradle dependencies works for me  Right click over the project -  Gradle -  Refresh Gradle Project

User · Answer

For temporary solution just right click on Project   gt  Properties   gt  Java compiler   gt  over there please select compiler compliance level 1 8   gt   class compatibility 1 8   gt  source compatibility 1 8  Then your code will start to execute on version 1 8

User · Answer

53 stands for java-9  so it means that whatever class you have has been compiled with javac-9 and you try to run it with jre-8  Either re-compile that class with javac-8 or use the jre-9

[java] Class has been compiled by a more recent version of the Java Environment

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