mod4j-buildtools
· The mod4j-build-tools module provides a place for build configurtation files. For example smartjava-checks.xml is stored
in here (See also: http://maven.apache.org/plugins/maven-checkstyle-plugin/tips.html).
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 mod4j-buildtools-1.0.1.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.