Unsupported major minor version 52 0

Question

Pictures    Command Prompt showing versions   Picture of error  Hello java  import java applet Applet  import java awt     public class Hello extends Applet           Java applet to draw  Hello World      public void paint  Graphics page            page drawString   Hello World    50  50             Hello html   lt HTML gt       lt HEAD gt           lt TITLE gt HelloWorld Applet lt  TITLE gt       lt  HEAD gt        lt BODY gt           lt APPLET CODE  Hello class  WIDTH 300 HEIGHT 150 gt           lt  APPLET gt       lt  BODY gt   lt  HTML gt    Error  Hello   Unsupported major minor version 52 0   What may the problem be

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I could solve the same problem using the below solution.

In my project, I added a JAR file which were created in Java 8. And my project was referring to JRE 7. When I changed project JRE to 8, my problem was solved.

Steps:

In Eclipse, right click on the project name in project explorer ? Build path ? Libraries ? click on JRE version ? click Edit ? Installed JRE ? Add ? Standerd VM ? select JRE home click-path (path should be localePath\java\jdk1.8.0_25\jre) ? provide name ? Save ? select same JRE for project ? Finish ? OK. Refresh/build project once ? try to run your Java file. It should work.

User · Answer

I solved my problem by removing old versions of JRE and installing JRE 8

User · Answer

You need to use JDK 1 7 0 rather than JDK 1 8 0   To make sure it  you need to delete JDK 1 8 0 on your computer   If you use Mac  you need to delete    Library Java JavaVirtualMachines jdk jdk   Library PreferencePanes JavaControlPanel prefPane   Library Internet Plug-Ins JavaAppletPlugin plugin  Then  you need to reinstall JDK 1 7 0  and you will succeed to generate the  jar file

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Just want to add this  I had this problem today  Adjusted the settings in my project  rebuilt  and same problem  I had  incorrectly  assumed that changing the settings in my project  Eclipse  would cause the projects on which my project depends to be recompiled also   Adjusting the settings to all of the projects up the dependency tree solved the problem

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If you are using IntelliJ IDEA  go to Project Structure  Ctrl   Alt   Shift   S   and you can change your project s JDK

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I had the same problem    a JDK and plug-in version conflict   I compiled using 1 8     the latest one  and that message started to appear  So I ve searched for the JRE 7  http   www oracle com technetwork java javase downloads server-jre7-downloads-1931105 html     and installed it    again    Now 1 8 and 1 7 in the same computer   Using NetBeans  and compiling  and targeting to version 1 7  fixed my problem

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You will need to change your compiler compliance level back to 1 7 in your IDE    This can be done in the preferences settings of your IDE  For example  in Eclipse go to menu Windows   Preferences  select Java  and expand it  Then select Compiler and change the compliance level to 1 7  I am sure this will work from there

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You may want to check your Run Configurations setting if you re using Eclipse nbsp v4 4  Luna  and have already completed all steps mentioned above   There could be several possibilities that cause this error  The root cause is a mismatch of the project require compilation in JDK1 8 JRE8 while the environment compiler is JDK1 7 JRE7   You can check my blog post to go through all your settings are correct

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Upgrade your Andorra version to JDK 1 8   This is a version mismatch that your compiler is looking for Java version 8 and you have Java version 7   You can run an app build in version 7 in version 8  but you can t do vice versa because when it comes to higher levels  versions are embedded with more features  enhancements rather than previous versions   Download JDK version from this link  And set your JDK path for this

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All you need to do to solve the problem is    to make sure your version of Java is the same for both compiling and running  No matter what tools or IDEs you are using

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Unsupported major minor version 52 0 comes when you are trying to run a class compiled using Java 1 8 compiler into a lower JRE version e g  JRE 1 7 or JRE 1 6  Simplest way to fix this error is install the latest Java release i e  Java 8 and run your program   Read more  http   javarevisited blogspot com 2015 05 fixing-unsupported-majorminor-version html ixzz4AVD4Evgv

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The smart way to fix that problem is to compile using the latest SDK and use the cross compilation options when compiling   To use the options completely correctly requires the rt jar of a JRE  not JDK  of the target version   Given the nature of that applet  it looks like it could be compiled for use with Java 1 1

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You must run and compile your application with the same version of Java   If you re using Eclipse you should do 2 things    In Eclipse  click on  Window   Preferences   and in the window that appears  on the left side  under  Java   click on  Installed JREs   click on  Add     and navigate to the folder that contains the JDK   Right-click on your project and click on  Properties   in the window that appears  on the left side  click on  Java Compiler  and uncheck  Use compliance from execution environment  on the Java Build Path   this allows you to choose in the the list  Compiler compilance level  the same version that you set in the previous step

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If you are using Eclipse  make sure your menu Project   Properties   Java build path   libraries   JRE system library matches your project requirements  as shown in the image

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This occurred to me when I installed a fresh Java 1 8  but left the old command line interpreter open   It had an old path and kept on executing the application with Java 1 7 whereas project was already built with Java 1 8

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It happens when you compile your projects on higher version of java say jdk 1 8  and then run it on a lower version  say jdk 1 7    If you have JRE-1 7 library in your project path then    1 Right click on project  2 Go to Properties   3 Select Project Facets  4 Find Java in rows and then choose version  say 1 7  if using JRE-1 7  5 Click Apply and run your project

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The issue is because of Java version mismatch  Referring to the Wikipedia Java Class Reference   Java SE 14   58 Java SE 13   57 Java SE 12   56  0x38 hex  Java SE 11   55  0x37 hex  Java SE 10   54 Java SE 9   53 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  These are the assigned major numbers  The error regarding the unsupported major minor version is because during compile time you are using a higher JDK and a lower JDK during runtime  Thus  the  major minor version 52 0  error is possibly because the jar was compiled in JDK 1 8  but you are trying to run it using a JDK 1 7 environment   The reported number is the required number  not the number you are using  To solve this  it s always better to have the JDK and JRE pointed to the same version  In IntelliJ IDEA   Go to Maven Settings   Maven   Importing  Set the JDK for importer to 1 8  Go to Maven Settings   Maven   Runner  Set the JRE to 1 8  Go to menu File    Project Structure   SDKs  Make sure the JDK home path is set to 1 8   Restart IntelliJ IDEA  Another approach which might help is by instructing IntelliJ IDEA which JDK version to start up with  Go to   Applications IntelliJ  IDEA  15  CE app Contents Info plist and replace the JVM version with   lt key gt JVMVersion lt  key gt   lt string gt 1 8  lt  string gt

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If your JDK version is right  Another reason that may cause this error is that your Android Studio is in a low version  but your Gradle version is too high  Upgrade your IDE to a newer version may help this

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If you have a problem in Android Studio and you have installed Android N  change the Android rendering version with an older one and the problem will disappear

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If you are using Linux and you have different versions of Java installed  use the following command   sudo update-alternatives --config java   This will give a quick way of switching between the Java versions installed on the system  By choosing Java 8 I will solve your problem

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If you re using the NetBeans IDE  right click on the project and choose Properties and go to sources  and you can change the Source Binary Format to a lower JDK version

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I had Java 1 7  amp  1 8 installed  with SBT 2 4 that requires Java 1 8   Even though my project was linked to Java 1 8  I had to change the JAVA HOME environment variable to point 1 8  Finally  problem solved

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Just go to http   java com en download  and update your version of JRE

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I ran into this issue in Eclipse on Mac nbsp OS nbsp X v10 9  Mavericks   I tried many answers on Stack nbsp Overflow     finally  after a full day I  installed a fresh version of the Android SDK  and updated Eclipse  menu Project   Properties   Android to use the new path     I had to get SDK updates  but only pulling down those updates I thought were necessary  avoiding APIs I were not working with  like Wear and TV     and that did the trick  Apparently  it seems I had corrupted my SDK somewhere along the way   BTW    I did see the error re-surface with one project in my workspace  but it seemed related to an import of appcompat-7  which I was not using  After rm-ing that project  so far haven t seen the issue resurface

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You need to upgrade your Java version to Java 8   Download latest Java archive  Download latest Java SE Development Kit 8 release from its official download page or use following commands to download from the shell   For 64 bit     cd  opt      wget --no-cookies --no-check-certificate --header  Cookie  gpw e24 http 3A 2F 2Fwww oracle com 2F  oraclelicense accept-securebackup-cookie   http   download oracle com otn-pub java jdk 8u51-b16 jdk-8u51-linux-x64 tar gz      tar xzf jdk-8u51-linux-x64 tar gz   For 32 bit     cd  opt      wget --no-cookies --no-check-certificate --header  Cookie  gpw e24 http 3A 2F 2Fwww oracle com 2F  oraclelicense accept-securebackup-cookie   http   download oracle com otn-pub java jdk 8u51-b16 jdk-8u51-linux-i586 tar gz       tar xzf jdk-8u51-linux-i586 tar gz   Note  If the above wget command doesn   t not work for you  watch this example video to download the Java source archive using the terminal   Install Java with alternatives  After extracting the archive file  use the alternatives command to install it  The alternatives command is available in the chkconfig package      cd  opt jdk1 8 0 51      alternatives --install  usr bin java java  opt jdk1 8 0 51 bin java 2     alternatives --config java   At this point Java 8 has been successfully installed on your system  We also recommend to setup javac and jar commands path using alternatives      alternatives --install  usr bin jar jar  opt jdk1 8 0 51 bin jar 2     alternatives --install  usr bin javac javac  opt jdk1 8 0 51 bin javac 2     alternatives --set jar  opt jdk1 8 0 51 bin jar     alternatives --set javac  opt jdk1 8 0 51 bin javac   Check installed Java version  Check the installed version of Java using the following command   root tecadmin    java -version  java version  1 8 0 51  Java TM  SE Runtime Environment  build 1 8 0 51-b16  Java HotSpot TM  64-Bit Server VM  build 25 51-b03  mixed mode    Configuring Environment Variables  Most of Java-based applications use environment variables to work  Set the Java environment variables using the following commands   Setup JAVA HOME Variable    export JAVA HOME  opt jdk1 8 0 51 Setup JRE HOME Variable    export JRE HOME  JAVA HOME jre Setup PATH Variable    export PATH  JAVA HOME bin  JRE HOME bin  PATH   Note that the change to the PATH variable put the new Java bin folders first so that they override any existing java bins in the path  It is a bit sloppy to leave two java bin folders in your path so you should be advised to clean those up as a separate task   Also  put all above environment variables in the  etc environment file for auto loading on system boot

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None of these answers helped me  but I found a solution  I had a webproject used in Wildfly 8 2  built with Maven  source and target was set to 1 8 on maven-compiler-plugin  as well as all Eclipse and Maven settings were set to Java 1 8  The problem was that Wildfly 8 2 cannot handle Java 1 8  so I had to set everything to 1 7 and it worked

[java] Unsupported major.minor version 52.0

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