Four properties do not report correct violation locations

[emopers]

For the following 4 properties: File_DeleteTempFile, ObjectInput_Close, StringBuffer_SingleThreadUsage, ObjectOutput_Close, violation locations would be shown as "Unknown." instead of the FQN of the Java file with line number.
Though we understand due to the formation of such properties it is hard to point out the exact place where the violation happens immediately, but at least it would be good if it could capture the location of TempFile creation or ObjectOutput opening and report it later. For example, we conceive is there any way to improve File_DeleteTempFile like:

File_DeleteTempFile(File f) {
         Location l;
         event create after returning(File f) :
                 call(File+ File.createTempFile(..)) { l = MOPLogging.getLocation(); }
         ...
         @violation {
                 MOPLogging.out.println(Level.CRITICAL, __DEFAULT_MESSAGE);
                 MOPLogging.out.println(Level.CRITICAL, "A temporary file created at " + l + " has not been deleted.");
         }
}

Is this feasible in JavaMOP? Thanks!