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This page (revision-12) was last changed on 25-Oct-2007 06:58 by MurrayAltheim  

This page was created on 09-Jun-2005 22:13 by 153.104.225.2

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A NullPointerException is the Java class name for a Java Exception which is thrown when an application tries to use a method on an uninitialized (or empty) object. In English, this is similar to receiving a letter asking you to fill out the enclosed questionnaire, but there is no enclosed questionnaire. You can't perform a task on an object that doesn't exist.swdfwef
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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Technically, Java objects are [pointers|http://en.wikipedia.org/wiki/Pointer] to areas in memory. When an object is uninitialized, it's value as far as the machine is concerned is zero, or null.
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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].
Version Date Modified Size Author Changes ... Change note
12 25-Oct-2007 06:58 1.062 kB MurrayAltheim to previous
11 29-Jul-2007 19:19 1.035 kB JanneJalkanen to previous | to last
10 29-Jul-2007 13:11 0.003 kB 88.229.197.196 to previous | to last
9 29-Jul-2007 13:10 4.756 kB 88.229.197.196 to previous | to last
8 09-Nov-2006 10:08 1.035 kB 128.2.155.137 to previous | to last
7 06-Nov-2006 18:27 1.043 kB 129.2.179.224 to previous | to last
6 05-May-2006 15:53 1.037 kB Jérôme Duprez to previous | to last
5 05-May-2006 11:16 1.057 kB Jérôme Duprez to previous | to last
4 05-May-2006 11:15 1.057 kB Jérôme Duprez to previous | to last
3 04-May-2006 17:31 0.743 kB Jérôme Duprez to previous | to last
2 04-May-2006 17:03 0.571 kB 80.3.160.13 to previous | to last
1 09-Jun-2005 22:13 0.564 kB 153.104.225.2 to last
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