If you're a developer, you probably know what a {{NullPointerException}} is. For more info and a discussion of consequences or programming practices, you can go to the Wiki Wiki Web's [NullPointerException|WikiWikiWeb:NullPointerException] page.

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If you're a MereMortal, and happen to stumble here because you found out a NPE in JSPWiki's logs, just know that a NullPointerException (often abbreviated as ''NPE'') signals that the java code attempted to access something that was not initialized. This is either a bug in the code, or a consequence of a bad configuration (but this might be a bug anyway, as the application should be robust enough to detect most configuration errors and log something more explicit as a message).

If you need to have this corrected (because for example you witnessed a degradation of functionality and you think the NPE is related), please try to search this site for related issues, starting at [JSPWiki Support]. If you find nothing that describes or correct your problem, enter a [bug report|Submit Bug Report].