Class file has wrong version 52 0 should be 50 0

Question

I m trying to compile my project in IntelliJ idea  I m using a class in an external jar file and on compilation receiving the above error   I understand that it s saying the jar file was compiled with a newer Java version than that which IntelliJ is using  My question is how do I make them compatible  I have updated the Java on my Mac to 1 8 and when I run java -version or javac -version it confirms this   What am I missing   Apart from Java development experience

User · Answer

If you are using javac to compile  and you get this error  then remove all the  class files rm   class       On Unix-based systems  and recompile  javac fileName java

User · Answer

Have got the same error as in header because of failed attempt to compile my project with java 8 and then reattempting to compile with java 6  Some classes where compiled at the first attempt with 8 and did not recompile with 6  Mixed classes did not compile then  Cleaning project solved the problem  This answer is not strictly relevant to the question  but could be useful for someone

User · Answer

It means your Java runtime version is 1 8  but your compiler version  javac  is 1 6  To simply solve it  just retreat the Java version from 1 8 to 1 6   But if you don t want to change the Java runtime version  then do the following steps    JAVA HOME   your jdk v1 8 folder path   to make sure jdk is also v1 8 and use java -version and javac -version again to ensure it Make sure IntelliJ  s compiler mode is set to compliant with v1 6 But i have tried that  it didn t solve my problem

User · Answer

Select  File  -   Project Structure    Under  Project Settings  select  Project   From there you can select the  Project SDK

User · Answer

i faced the same problem  Class file has wrong version 52 0  should be 50 0  when running java through ant    all i did was add fork  true  wherever i used the javac task and it worked

User · Answer

In your IntelliJ idea find tools jar replace it with tools jar from yout JDK8

[java] Class file has wrong version 52.0, should be 50.0

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