jar tool does,nt gives any exception when we try to extract a tar file. and also it does,nt extracts a tar file. We expect it to throw some kind of non-compatible file type Exception or something of that kind.

Steps to reproduce the problem
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set PATH=jdk1.4

tar -cvf a.tar *.java
jar -xvf a.tar
***does'nt produces any output and the tool exits