How to get line number of specific stacktrace
    private static void log(String prefix, 
        String message) {

        StackTraceElement ste = 
            new Exception().getStackTrace()[2];

        System.out.println("[" + prefix + "] " +
                ste.getClassName() + "." + 
                ste.getMethodName() + "(" +
                ste.getLineNumber() + "): " + 
                message);
    }

http://jroller.com/page/davinci/20050602#abusing_java_for_debugging_purposes

Annotation of using stacktrace - http://www.theserverside.com/news/thread.tss?thread_id=55238#312195