aspose file tools*
The moose likes Programmer Certification (SCJP/OCPJP) and the fly likes Thread start Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login

Win a copy of EJB 3 in Action this week in the EJB and other Java EE Technologies forum!
JavaRanch » Java Forums » Certification » Programmer Certification (SCJP/OCPJP)
Bookmark "Thread start" Watch "Thread start" New topic

Thread start

Saibabaa Pragada
Ranch Hand

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

Joined: Sep 20, 2010
Posts: 3366
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.
jQuery in Action, 2nd edition
subject: Thread start
Similar Threads
synchronized method
Problem : Threads ; Reference Cert Pal
Threads - static variable and static/non static method execution
Using non-static object as lock in Threads PRoblem