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Similarly, it is inappropriate to start threads from constructors (see CON14CON16-J. Do not let the (this) reference escape during object construction for more information). Creating timers that perform recurring tasks and starting those timers from within code responsible for initialization also creates liveness issues.
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<ac:structured-macro ac:name="anchor" ac:schema-version="1" ac:macro-id="ad8a0c52ee27aa88-a9d08e30-432c4692-915fbf8e-90439bed341bdb33e13bfbf0"><ac:parameter ac:name="">CON03-EX1</ac:parameter></ac:structured-macro> *CON03-EX1:* It is permissible to start a background thread during class initialization provided the thread does not access any fields. For example, the {{ObjectPreserver}} class (based on \[[Patterns 02|AA. Java References#Patterns 02]\]) shown below provides a mechanism for storing object references, which prevents an object from being garbage-collected, even if the object is not dereferenced in the future. |
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