Java not found error occurred while running java application in FX9600 reader

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Hii,

I am trying to run a java application (.jar file) in FX9600 RFID Reader through telnet but I am getting error as "java not found".
But, as far as my knowledge, FX9600 reader comes with java pre-installed.
Java was working in RFID reader 2-3 before.

Please if somebody already faced this issue, I would greatly appreciate the help!.

Cheers,
Ashish