[news.eclipse.platform.swt] "signer information does not match signer in

[Berk Birand <dont@xxxxxxxx>]

Hi,

I accidentally posted this question to eclipse.platform, but I suppose I 
should have posted it here in the firt place, since it deals with JFace 
classes. I apologize for the repost... 




I need to use the JFace ILazyTreeContentProvider interface for my JFace 
project. However, when I try to use a class that implements that interface, 
I get the following error:

Exception in thread "main" java.lang.SecurityException: class 
"org.eclipse.jface.viewers.ILazyTreeContentProvider"'s signer information 
does not match signer information of other classes in the same package

In my project, all of the required .jar files come from the 
$ECLIPSE_HOME/plugins directory (I have 5 .jar files, all either swt or 
jface related).

Although I searched the web, I couldn't find any consistent advice on 
solving this problem. Some said changing the priority order would help, but 
it didn't work for me (I didn't really know how to specifically change it).

When I ran jarsigner on each of the .jar files, they all pass the test 
saying that they are signed.

Can somebody please tell me how to solve this problem? When I try to 
implement the ITreeContentProvider interface, which belongs to the same 
.jar file, I don't get any errors.

Any help would be much appreciated,
Sincerely, 
 Berk