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Diagnosing Java Code: The Impostor Type bug pattern

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Diagnosing Java Code: The Impostor Type bug pattern

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When special tags in fields are used to distinguish between types of objects, errors are possible in which a tag mislabels the associated data -- a bug pattern known as the Impostor Type. This article examines the symptoms and causes of this bug, defines ways to prevent this error from occurring, and discusses a tempting hybrid implementation that does not use impostor types but, in the end, turns out to have many of the same weaknesses. Article includes code snipets.
Platform(s): n/a
Date: Jul, 03 2001
Author: http://www-106.ibm.com/developerworks/java/library/j-diag0703?open&l=766,t=grj,p=ImposterBug
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