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How to fix java.lang.unsupportedclassversionerror unsupported major.minor version 49.0 50.0 51.0...

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Javin Paul

Posts: 1090
Nickname: javinpaul
Registered: Jan, 2012

Javin Paul is Java Programmer working on Finance domain.
How to fix java.lang.unsupportedclassversionerror unsupported major.minor version 49.0 50.0 51.0... Posted: Oct 26, 2012 4:34 AM
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java.lang.unsupportedclassversionerror unsupported major.minor version 50.0 error comes in Java environment when you compile your Java file in a higher Java version e.g. Java 1.6 and then trying to run same Java program in lower Java version e.g. Java 1.5. Java is backward compatible i.e. you can run your Java 5 binary or JAR into Java or JRE 6 but vice-versa is not true. You can not run Java program which is compiled in higher Java version into lower JRE. class file version changes between every Java version and class file generated by javac command of Java 6 installation is not appropriate  for JRE of Java 5 Installation. In order to solve java.lang.unsupportedclassversionerror unsupported major.minor version 49.0 , 50.0 or 51.0 we need to first understand What is major and minor version of class file in Java. Every Java release has a major source version as shown in this table
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