This application is mainly intended to log Run time Error messages that happens at runtime.  This is a fast and flexible framework for logging application debugging messages. Inserting log statements into your code is a low-tech method for debugging it. In the Java language where a preprocessor is not available, log statements increase the size of the code and reduce its speed, even when logging is turned off. Given that a reasonably sized application may contain thousands of log statements, speed is of particular importance.  This application makes it possible to enable logging at runtime without modifying the application binary. The project is designed in such a way that these statements can remain in shipped code without incurring a heavy performance cost. Logging behavior can be controlled by editing a configuration file, without touching the application binary.  Using a logger hierarchy it is possible to control which log statements are output at arbitrarily fine granularity but also great ease. This helps reduce the volume of logged output and minimize the cost of logging.