Core Java - Illegal State of Exception

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Illegal State of Exception

When does thread throws illegal state of exception?
Explain with two scenarios?

Total Answers and Comments: 3

Last Update: September 27, 2008 Asked by: dsureshkumar28

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Best Rated Answer

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Submitted by: abuthahir.d

1.Whenever a dead thread is tried to start
2. When we try to start a running thread
eg:
Thread t = new Thread();
t.start();
t.start();

throws IllegalThreadStateException

Above answer was rated as good by the following members:
shouvanik1979, swpnl_ptl, talktoatish

April 14, 2008 07:31:38

abuthahir.d

Member Since: January 2008 Contribution: 9

RE: Illegal State of Exception

1.Whenever a dead thread is tried to start
2. When we try to start a running thread
eg:
Thread t new Thread();
t.start();
t.start();

throws IllegalThreadStateException

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2 0

Overall Rating: +2

April 29, 2008 05:40:04

charankk

Member Since: April 2008 Contribution: 5

RE: Illegal State of Exception

Hi
There are one scenario where we can use it as shown below.
Two threads within the JVM both gain access to the same object. One thread invalidates the object and then the other thread attempts to use the same object where its been not exists.

In this scenarios jvm thows the java.lang.IllegalStateException.

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September 27, 2008 10:46:41

mkgraumt

Member Since: September 2008 Contribution: 1

RE: Illegal State of Exception

Any attempt to change the status after the thread has been started throws an IllegalThreadstateException.

Scenerio 1

If a thread has already started and you try to call method setDaemon(boolean) on thread

t.setDaemon(true);

Scenerio 2

If you call start() method on a thread which has already been started it will throw IllegalThreadstateException.

t.start();

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