thavali wrote:java.lang.SecurityException: class "org.eclipse.jdt.core.dom.AnonymousTypeDeclaration2"'s signer information does not match signer information of other classes in the same package
While the above is certainly true (and even expected), it should not result in any exception or cause any problem in Eclipse.
Have you modified any security settings in Eclipse or in the JVM? Have you modified the default eclipse.ini file? What exact JVM are you using?
Please send us your "Installation Details > Configuration" from the Eclipse About dialog.