JDBCImporter
· JDBC Importer provides a consistent mechanism of importing data from files into a JDBC compliant database through a simple interface and an XML config file
Download JD-GUI to open JAR file and explore Java source code file (.class .java)
Click menu "File → Open File..." or just drag-and-drop the JAR file in the JD-GUI window jdbcimporter-parent-0.74.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.