try renaming field in a class, save and compile 

example : In Department class rename deptid to dept => save => compile

result : so many compilation errors since renaming is not modifying the source
properly


compiler output :

TestPack/Department.java [18:1] cannot resolve symbol
symbol  : variable deptid  
location: class TestPack.Department
        return deptid;
               ^
TestPack/Department.java [22:1] cannot resolve symbol
symbol  : variable deptid  
location: class TestPack.Department
        this.deptid = deptid;
        ^
TestPack/Department.java [42:1] cannot resolve symbol
symbol  : variable deptid  
location: class TestPack.Department
        out.writeLong( deptid );
                       ^
TestPack/Department.java [47:1] cannot resolve symbol
symbol  : variable deptid  
location: class TestPack.Department
        deptid = in.readLong();
        ^
4 errors
Errors compiling Department.

**** This bug was moved from bugtraq. Bugtraq number #4435035 ****