Why Eclipse does not see .jar file of a library?

Posted by Roman on Stack Overflow See other posts from Stack Overflow or by Roman
Published on 2010-04-14T14:59:03Z Indexed on 2010/04/14 15:03 UTC
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java

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eclipe

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jar

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library

I have a java project in which I have "Referenced Libraries". In the "Referenced Libraries" I have a .jar file of a library that I use (I use only one external library).

When I try to "Run -> Run" the code I have a NullPointerException. From my previous experience I know that it it (very likely) because my code does not see the library.

I just started to use Eclipse and it can be the I do not "connect" libraries in a correct way. Should I use some options or additional action to force Eclipse to see the .jar file of the library?

ADDED:

By the right click on the library I get a drop-down menu in which I see "Build Path". My be I need to do something there?

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