- 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
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Signing & verifying http://docs.oracle.com/javase/tutorial/deployment/jar/signindex.html
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Using basics http://docs.oracle.com/javase/tutorial/deployment/jar/basicsindex.html
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Packaging http://docs.oracle.com/javase/tutorial/deployment/jar/