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starting a thread

Posted on 2012-03-18
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Last Modified: 2012-03-25
hi

Why is it inadvisable to start a thread from a constructor or Static initializer?
Looking for a simple explanation with example

thanks
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Question by:royjayd
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by:for_yan
ID: 37736070
This is an explanation

http://stackoverflow.com/questions/5623285/java-why-not-to-start-a-thread-in-the-constructor-how-to-terminate


      

 Starting a thread in a constructor passing in this escapes this. That means that you are actually giving out a reference to your object before it is fully constructed. The thread will start before your constructor finishes. This can result in all kinds of weird behaviors.

look at the code examples in the link
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for_yan earned 500 total points
ID: 37736238
This is explanation why threads should not be run in static initiliazer (with many examples in the link):

https://www.securecoding.cert.org/confluence/display/java/TSM02-J.+Do+not+use+background+threads+during+class+initialization


Starting and using background threads during class initialization can result in class initialization cycles and deadlock. For example, the main thread responsible for performing class initialization can block waiting for the background thread, which in turn will wait for the main thread to finish class initialization. This issue can arise, for example, when a database connection is established in a background thread during class initialization [Bloch 2005b]. Consequently, programs must ensure that class initialization is complete before starting any threads.
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