Exection error

What does a null pointer execption mean? and is there a resource on the web where I can find what execption errors mean?

thanks for the help

orlando
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Orlando15767Asked:
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objectsCommented:
it means an attempt has been made to reference a variable whose value is null
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objectsCommented:
eg.

String s = null;
int n = s.length();   // <--- NPE
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Orlando15767Author Commented:
thanks

do you know of a web site where I can look up the meaning of errors?
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objectsCommented:
your javadoc is probably a good place to start.
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Orlando15767Author Commented:
okay, thanks
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objectsCommented:
no worries :)
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