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First, navigate to the progectname dir

jar cvf projectame.war *

jar cf web-app.war *
(What’s the difference between cvf and cf?)

jar cf ear_app.ear web-app.war META-INF
(to deploy on JBoss)

* means “all files in this dir”

Prerequisits:
The dir %JAVA_HOME%\bin must be on the sys env var Path.
This is where jar executable lives.
JDK must be installed. (v1.5 currently)