UnsupportedClassVersionError unsupported major minor version 51 0 unable to load class

Question

Possible Duplicate    Exception in thread  ldquo main rdquo  java lang UnsupportedClassVersionError  a  Unsupporte d major minor version 51 0        i have developed an web application in java using jdk 1 7 0  Eclipse IDE  Indigo  and is running that application on the tomcat apache-tomcat-7 0 23  configured in eclipse ide    When i tried to run my application through IDE it runs fine but when i created its war and placed it in apache deployment folder webapps  and run it from outside the IDE the start page gets successfully loaded but when i tried to do any operation over it it gives me an error  UnsupportedClassVersionError unsupported major minor version 51 0 unable to load class bean myclassname   i have checked the java version outside ide its jdk 1 7 0 and also the JAVA HOME environment variable is set to C  Program Files Java jdk1 7 0 01

User · Answer

Try adding the following to your eclipse ini file   -vm C  Program Files Java jdk1 7 0 01 bin java exe   You might also have to change the Dosgi requiredJavaVersion to 1 7 in the same file

User · Answer

java home environment variable should point to the location of the proper version of java installation directory  so that tomcat starts with the right version  for example it you built the project with java 1 7   then make sure that JAVA HOME environment variable points to the jdk 1 7 installation directory in your machine   I had same problem   when i deploy the war in tomcat and run  the link throws the error  But pointing the variable - JAVA HOME to jdk 1 7 resolved the issue  as my war file was built in java 1 7 environment

User · Answer

Well presumably it s not using the same version of Java when running it externally  Look through the startup scripts carefully to find where it picks up the version of Java to run  You should also check the startup logs to see whether they indicate which version is running   Alternatively  unless you need the Java 7 features  you could always change your compiler preferences in Eclipse to target 1 6 instead

User · Answer

Even though your JDK in eclipse is 1 7  you need to make sure eclipse compilance level also set to 1 7  You can check compilance level--  Window-- Preferences--  Java--Compiler--compilance level   Unsupported major minor error happens in cases where compilance level doesn t match with runtime

[java] UnsupportedClassVersionError unsupported major.minor version 51.0 unable to load class

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