Here is a simple snippet to find out the calling Java Class.

Class.forName(new Throwable().getStackTrace()[2].getClassName()));

Converting images from gif to jpg for web or other reason can be done easily using the ImageIO package. The following snippet convert all the gif images in directory rootDir to jpg images.Compile this class and execute using java command line. This utility class is also available as part of the Livrona Tools Project.The following is the code for the Image Converter.