Can t fix Unsupported major minor version 52 0 even after fixing compatibility

Question

When I try running my java  jar on another machine I get the error     Unsupported major minor version 52 0   I compiled my program using the jdk 1 6 and my machine  separate one  has java 7 installed   This is the java version my machine is running     Here are the settings in my IDE  Eclipse Lunar       Why am I still getting an unsupported error   I did check my run configuration and change it to jre6  but when I do I can t even run my program in the IDE   Note  I would like my program to work with jdk 6  if that is not possible jdk 7   My Class Path

User · Accepted Answer

I agree with chrylis  you believe you changed your project s compliance settings but probably you didnt   Right click on your project and    Java   Build Path   Go to Libraries tab and ensure yourself that you are really using jre6 Java   Compiler   Ensure yourself that you have selected 1 6 compliance   By the way you can  tell  eclipse that jre8 is 1 6 compliance clicking on  Window Preferences Java Installed JREs Execution Environment and selecting in the left panel  Execution Environments  JavaSE-1 6 and in the Compatible JRE s panel  jre8

User · Answer

I had the same issue  Turned out I used some external jars  apache poi 4 1 2  which were compiled with 1 8  Solved it by changing Java Build Path JRE to 1 8

User · Answer

First of all thank you for all above answers   However  I use Intellij Idea for daily basis  So  I hope my answer will help others    Run your favourite terminal or command line  Then check your java version by running command   java -version   Then in Intellij press  Ctrl Alt Shift S  in the   Project Settings   tab under   Project SDK   choose appropriate java version  Lastly  rerun your code

User · Answer

Are you using retrolambda  If so  just do JAVA HOME  JAVA8 HOME   Source  https   github com evant gradle-retrolambda issues 74

User · Answer

I also had to update the version of Tomcat I was using from Tomcat 7 to Tomcat 8

User · Answer

If you are trying to execute your program application from the command prompt  Just make sure to restart your cmd after you have changed the JAVA HOME var  Very simple but easily missed sometimes

User · Answer

I Encounter similar issue while doing development on Android Studio 2 2   My Machine Configuration -   JDK version 1 7 0 79 installed JDK version 1 8 0 101 installed Environment variable contains   JAVA HOME   1 7 0 79 JDK path and same is added to path variable Project SDK Location   C  Program Files Java jdk1 8 0 101   I then made below changes -  1  Uninstall JDK 1 7 0 79   2  Updated JAVA HOME   1 8 0 101 JDK path  Similar to SDK Location   Now i am able to compile and run my application successfully   no more Unsupported major minor version 52 0 Error

User · Answer

Hi I found this link that helped me understand the issue  Hope it is useful   Version released so far are       Java SE 8   52      Java SE 7   51  Java SE 6 0   50  Java SE 5 0   49  JDK 1 4   48  JDK 1 3   47  JDK 1 2   46  JDK 1 1   45   and from thata data it simply means   Many people think why do you get a version mismatch error if Java is backward compatible  Well  its true that Java is backward compatible  which means you can run a Java class file or Java binary  JAR file  compiled in lower version  java 6  into higher version e g  Java 8  but it doesn t mean that you can run a class compiled using Java 7 into Java 5  Why  because higher version usually have features which are not supported by lower version   Sometimes you may have more than one version of Java installed in you machine  Make sure the application you are running is pointing to the right or highest version available

User · Answer

I had also same issue  I solved this problem by updating my system jdk  Previously i used jdk7 0 and now it is updated to jdk8 0  find below link to download the updated jdk with new version  it help me to solve my problem   http   www oracle com technetwork java javase downloads jdk8-downloads-2133151 html

User · Answer

Right Click on Project   Properties ---  Java Compiler   on same page change compiler Compliance Level to 1 6  or  1 7  or  1 8   match with your JAVA HOME

User · Answer

Several possiblies that causes this problem  The root cause is mismatched of compiler version between projects and IDE   For windows environment you can refer to this blog to do the detail troubleshooting

User · Answer

The error happens when you have compiled with higher version of Java and it is been tried to run with lower version of JRE  Even with minor version mismatch you would have this issue  I had issue compiling with JDK 1 8 0 31 and it was run with jdk1 8 0 25 and was displaying the same error  Once either the target is updated to higher version or compiled with same or lesser version would resolve the issue

User · Answer

Its a silly problem  just make sure that the jdk and jre are latest version  This problem mainly occurs due to the automatic update of java jre  and the jdk is not supported to that version  this makes problem

[java] Can't fix Unsupported major.minor version 52.0 even after fixing compatibility

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