Error when importing an old web dynpro project

Question

Hi all,
I've have upgraded my Sap Netweaver Developer Studio from 2.0.13 to 7.0 .
Now when i try to compile my old WD project it returs the seguent errors:
1)The project was not built since its classpath is incomplete. Cannot find the class file for java.lang.Object. Fix the classpath then try rebuilding this project     
2)This compilation unit indirectly references the missing type java.lang.Object (typically some required class file is referencing a type outside the classpath)     PackagePointer.java     Project/gen_ddic/datatypes/com/sap/function/model/types     line 1
Where can i find the java.lang.Object?
thanks, Daniele

Answer 1

Hi all,
maybe is too late.. but I wish to share my humble experience with you.
I encounter in a similar problem...
When I'm working with Web Dynpro (Messagge Pool) suddenly the NWDS seems to be crazy and give me the error "this compilation unit indirectly references the missing type java.lang.Object "
I read many post, this one too, but still got the problem.
Compare the current WD project with another one I found that my project didn't have rt.jar ibrary in its library list.
So I add in WD project - properties - Java build Path - Libraries  the rt.jar library.
In my case it was in C:\j2sdk_dir\jre\lib\rt.jar.
So I build project and the problem desappear.
I hope this experience will be usefull.
Cristian