log4jdbc-log4j2
· A modification of log4jdbc to natively use Log4j 2 (or SLF4J as usual), that supports from JDBC 4.1 to JDBC 3, includes all the improvements of log4jdbc-remix, and provides new improvements on its own.
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 log4jdbc-log4j2-1.16.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.
