I stupidly added a jar-file to the JRE System Library and when I now removed it my java-program stops working correctly. I get an error message of the following type, even though I am not using the jar-file!
Project 'MyProject' is missing required library: 'C:\Program Files\Java\jre1.6.0\lib\ext\commons-codec-1.3.jar'
How can I make Eclipse understand that the jar file in question doesn't belong in the System Library?
Hm it works if I remove the System Library and add it as an external one, but if I start a new project the "old" System Library is added as standard. The best thing would be if it is possible to modify this one.