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<ac:structured-macro ac:name="anchor" ac:schema-version="1" ac:macro-id="757c81769ee6a50a-db15ebd6-48a24101-a5f792ef-99ec25342dcfd02916b6068b"><ac:parameter ac:name="">CON20-EX1</ac:parameter></ac:structured-macro>
*CON20-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.