Failed to resolve JVM

I have recently downgraded my version of java as 1.4.0 caused problems with my apps. I now have 1.3.1 installed but when I try to install a .jar file I get "error 601 : failed to resolve JVM"
I have Redhat 7.3 and blackdown j2sdk1.3.1_02

Any Ideas?

Thanks

 

 

 

 

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