Compiling java file with JRE 1.5.0_22, but the output class shows version 1.6 : 50.0, super bit ?

[Amandeep Singh]

Hello,

I'm surprised to find out in eclipse where setup library is JRE 1.5.0_22, but the output compiled class shows version version 1.6 : 50.0, super bit? . Any clue?

Now if I run the class with JRE 1.5.0_22, it will give me error obviously-
java.lang.UnsupportedClassVersionError: Bad version number in .class file

Thanks

[Jesper de Jong]

You're not compiling anything with JRE 1.5.0_22 - the JRE doesn't contain a Java compiler. You need a JDK for compiling Java source code.

And Eclipse doesn't even use the Java compiler from the JDK; it has its own built-in Java compiler.

Somewhere in your project configuration you should be able to specify what version the produced class files should be compatible with. Have a look at your project configuration.

[Amandeep Singh]

thanks


back to basics

I did changed the configuration here-

org.eclipse.jdt.core.prefs

#Mon Feb 21 08:54:12 EST 2011
eclipse.preferences.version=1
org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.5
org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
org.eclipse.jdt.core.compiler.compliance=1.5
org.eclipse.jdt.core.compiler.debug.lineNumber=generate
org.eclipse.jdt.core.compiler.debug.localVariable=generate
org.eclipse.jdt.core.compiler.debug.sourceFile=generate
org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
org.eclipse.jdt.core.compiler.source=1.5