JRE system library not found exception in eclipse

Dear All, I am eclipse3.1 IDE for java under fedora 8 environment. I installed fresh copy of eclipse and trying to run a program,it shows JRE s开发者_运维百科ystem library not found exception popup. I added this library manually by BuildPath-----> Add external library but still i am getting that popup. How to solve this problem.

Go to Window - Preference - Java - Installed JREs page to specify the location of your jre or JDK.

Go to Project > Properties >Java Build Path > Libraries > Add Library > Next > Just Finish This is work for me

I'm no expert but maybe try checking in Java Build Path that your lib appears in the Libraries tab and that in "Order and Export" tab it is checked

otherwise have you tried refreshing cleaning and rebuilding?(sometimes eclipse is a bit slow in detecting changes

final check that the path of the library is the good one (it happened when I committed a project to the svn and used it on a different computer, everything was there but since the computers had different names (C:\jason... and C:\jasonlaptop...) it wasn't working.

let me know if it changed anything