Unable to open  jar files in Fedora

Unable to open jar files in Fedora core 5 and getting an error messege
java -jar ezim.jar
Exception in thread "main" java.lang.ClassFormatError: org.ezim.core.Ezim (unrecognized class file version)
at java.lang.VMClassLoader.defineClass (libgcj.so.7)
at java.lang.ClassLoader.defineClass (libgcj.so.7)
at java.security.SecureClassLoader.defineClass (libgcj.so.7)
at java.net.URLClassLoader.findClass (libgcj.so.7)
at java.lang.ClassLoader.loadClass (libgcj.so.7)
at java.lang.ClassLoader.loadClass (libgcj.so.7)
at java.lang.Class.forName (libgcj.so.7)
at gnu.java.lang.MainThread.run (libgcj.so.7)
I have installed java from java.com

Any Jar file by default is associated in Windows as a Executable Jar File.When you click it the JVM tries to launch it as an standalone application But those files are not standalone applications and they don't contain Main-Class attribute in the manifest.mf file.
If you want to open jar files with a single click you will need to associate Jar files with winrar or open them directly.
It is not recommended to modify any file or their values.
Regards,
German

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