[IAN] This is defined as correct behavior of javac...
[BAT]  However javac doesn`t compile such code -(I mean javac.exe )

Example
Consider such hierarchy

   PackageA
       | - ClassA

and source of ClassA  looks like this:

package PackageB;

class ClassA {
}


Compiler compiles it OK, but IMHO it is not desired. Because it could lead to very strange exceptions. The class file is PackageB.ClassA  but Netbeans considered PackageA.ClassA