Solving Maven problems within Eclipse

Hi, 

I've modified the .project and .classpath files in Eclipse to get rid of the error "Unsupported IClasspathEntry kind=4".

The thing is... I get I get the following "invalid POM" errors:

[WARNING] The POM for com.openlink.virtuoso:virtjdbc4:jar:7.0.0 is invalid, transitive dependencies (if any) will not be available, enable debug logging for more details
[WARNING] The POM for net.sourceforge.owlapi:owlapi:jar:3.1.0 is invalid, transitive dependencies (if any) will not be available, enable debug logging for more details

Could you please help me solving them?