1. jar file structure http://docs.oracle.com/javase/7/docs/technotes/guides/jar/jar.html

http://docs.oracle.com/javase/7/docs/technotes/guides/jar/jar.html#JAR%20Manifest

1. Signing & verifying http://docs.oracle.com/javase/tutorial/deployment/jar/signindex.html

2. Using basics http://docs.oracle.com/javase/tutorial/deployment/jar/basicsindex.html

3. Packaging http://docs.oracle.com/javase/tutorial/deployment/jar/