UnsupportedClassVersionError JVMCFRE003 bad major version in WebSphere AS 7

Question

I am getting this error  java lang UnsupportedClassVersionError  JVMCFRE003 bad major version  class map CareMonths  offset 6  My Eclipse s Java compiler is set to 1 6 and my installed Java SDK in C  Program Files is 1 6 0  but still I get this error when I install my app to Webshere Application Server V7    What does offset 6 mean  I want to compile using Java 6 and Websphere 7 supports Java 6   I do see that the JDK in the IBM directory where server is installed is Java 7  Is that what is causing this       but again my workspace s Eclipse compiler is set to Java 1 6

User · Answer

This error can occur if you project is compiling with JDK 1 6 and you have dependencies compiled with Java 7

User · Answer

I was getting the same error  In the Project Facets of my Java project  the Java compile level was set to 1 7 whereas the WebSphere Application Server v7 0 had a Runtime Composition of JRE v1 6  setting the Java compile level to 1 6 in Project Facets got rid of the error  I did not have to change the Compiler compliance level though  it s still 1 7  Hope this helps

User · Answer

In eclipse  Go to Project- Properties- Java build Path- Order and Export  If you are using multiple JREs   try like jdk and ibm  Order should start with jdk and then IBM  This is how my issue was resolved

User · Answer

I was getting this error in websphere 8 5   java lang UnsupportedClassVersionError  JVMCFRE003 bad major version  class com xxx Whatever  offset 6  I had my project JDK level set at 1 7 in eclipse and was8 by default runs on JDK 1 6 so there was a clash   I had to install the optional SDK 1 7 to my websphere server and then the problem went away   I guess I could have also set my project level down to 1 6 in eclipse but I wanted to code to 1 7

User · Answer

I fixed it by setting up env  variable JAVA HOME

User · Answer

You should also make sure you have set appropriate Project Facets Java version  Module Properties -  Project Facets -  Java 1 6 should be checked

User · Answer

I was getting the same error even after doing above changes and what i did is  Right click on the project- properties- java compiler- Compiler compliance level- changes it to 1 6  This change is particular for the project  This should hopefully work

User · Answer

If you use maven try to add in the pom xml   lt properties gt               lt maven compiler source gt 1 7 lt  maven compiler source gt       lt maven compiler target gt 1 7 lt  maven compiler target gt           lt  properties gt    Otherwise try to change the compiler version

User · Answer

If the log indicates java lang UnsupportedClassVersionError  JVM     bad major version   Then the code and server is not compiled with the same JDK version   To fix this  please  switch the JDK version either in code or server JDK   Try this - In the below use case  im switching to 1 7 64  JDK 1 7 64 bit      c  IBM WebSphere WSRR v8 5 bin managesdk bat -enableProfile   -profileName WSRRSrv01 -sdkname 1 7 64

User · Answer

At first you should check major version of compiled problematic  class file  in your case map CareMonths  See this answer how to do it   WAS7 uses Java 6  as said Jacek   and Java 6 uses major version 50  so you have to compile your project with Java 6  How to set proper version of Java compiler depends on your IDE  e g  Eclipse  IntelliJ  or build tool  e g  Maven  Ant

User · Answer

WebSphere Application Server V7 does support Java Platform  Standard Edition  Java SE  6  see Specifications and API documentation in the Network Deployment  All operating systems   Version 7 0 Information Center  and it s since the release V8 5 when Java 7 has been supported   I couldn t find the Java 6 SDK documentation  and could only consult IBM JVM Messages in Java 7 Windows documentation  Alas  I couldn t find the error message in the documentation either   Since java lang UnsupportedClassVersionError is  Thrown when the Java Virtual Machine attempts to read a class file and determines that the major and minor version numbers in the file are not supported    you ran into an issue of building the application with more recent version of Java than the one supported by the runtime environment  i e  WebSphere Application Server 7 0   I may be mistaken  but I think that offset 6 in the message is to let you know what position caused the incompatibility issue to occur  It s irrelevant for you  for me  and for many other people  but some might find it useful  esp  when they generate bytecode themselves   Run the versionInfo command to find out about the Installed Features of WebSphere Application Server V7  e g   C  IBM WebSphere AppServer gt   bin versionInfo bat WVER0010I  Copyright  c  IBM Corporation 2002  2005  2008  All rights reserved  WVER0012I  VersionInfo reporter version 1 15 1 47  dated 10 18 11  -------------------------------------------------------------------------------- IBM WebSphere Product Installation Status Report --------------------------------------------------------------------------------  Report at date and time February 19  2013 8 07 20 AM EST  Installation -------------------------------------------------------------------------------- Product Directory        C  IBM WebSphere AppServer Version Directory        C  IBM WebSphere AppServer properties version DTD Directory            C  IBM WebSphere AppServer properties version dtd Log Directory            C  ProgramData IBM Installation Manager logs  Product List -------------------------------------------------------------------------------- BPMPC                    installed ND                       installed WBM                      installed  Installed Product -------------------------------------------------------------------------------- Name                  IBM Business Process Manager Advanced V8 0 Version               8 0 1 0 ID                    BPMPC Build Level           20121102-1733 Build Date            11 2 12 Package               com ibm bpm ADV V80 8 0 1000 20121102 2136 Architecture          x86-64  64 bit  Installed Features    Non-production                       Business Process Manager Advanced - Client  always installed  Optional Languages    German                       Russian                       Korean                       Brazilian Portuguese                       Italian                       French                       Hungarian                       Simplified Chinese                       Spanish                       Czech                       Traditional Chinese                       Japanese                       Polish                       Romanian  Installed Product -------------------------------------------------------------------------------- Name                  IBM WebSphere Application Server Network Deployment Version               8 0 0 5 ID                    ND Build Level           cf051243 01 Build Date            10 22 12 Package               com ibm websphere ND v80 8 0 5 20121022 1902 Architecture          x86-64  64 bit  Installed Features    IBM 64-bit SDK for Java  Version 6                       EJBDeploy tool for pre-EJB 3 0 modules                       Embeddable EJB container                       Sample applications                       Stand-alone thin clients and resource adapters Optional Languages    German                       Russian                       Korean                       Brazilian Portuguese                       Italian                       French                       Hungarian                       Simplified Chinese                       Spanish                       Czech                       Traditional Chinese                       Japanese                       Polish                       Romanian  Installed Product -------------------------------------------------------------------------------- Name                  IBM Business Monitor Version               8 0 1 0 ID                    WBM Build Level           20121102-1733 Build Date            11 2 12 Package               com ibm websphere MON V80 8 0 1000 20121102 2222 Architecture          x86-64  64 bit  Optional Languages    German                       Russian                       Korean                       Brazilian Portuguese                       Italian                       French                       Hungarian                       Simplified Chinese                       Spanish                       Czech                       Traditional Chinese                       Japanese                       Polish                       Romanian  -------------------------------------------------------------------------------- End Installation Status Report --------------------------------------------------------------------------------

User · Answer

In this Eclipse Preferences panel you can change the compiler compatibility from 1 7 to 1 6  This solved the similar message I was getting  For Eclipse  it is under  Preferences -  Java -  Compiler   Compiler compliance level

[java] UnsupportedClassVersionError: JVMCFRE003 bad major version in WebSphere AS 7

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