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JavaRanch » Java Forums » Certification » Programmer Certification (SCJP/OCPJP)
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Saibabaa Pragada
Ranch Hand

Joined: Oct 24, 2010
Posts: 162
Hi, Why I am getting Runtime Exception as given below.
Stephan van Hulst
Bartender

Joined: Sep 20, 2010
Posts: 3658
    
  17

You are getting a runtime exception because you can start the thread only once. You are starting the same thread, because the getInst() method returns the same (static) Thread, regardless of what object you call it on.

The reason you are getting a stack overflow error, is because if you remove the static modifier, when the tr member is initialized, that new member will also initialize it's internal tr reference, which in turn will initialize it's initial reference, etc, etc, ad infinitum.
 
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