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a web application running on a server) in which we cannot use an IDE to re-built the project.

Another typical case is bug-fixing, re-configuration and re-deployment in a production environment (i.e. For example, when we made some very little changes to the project and need to re-build it without opening Eclipse (which may take times and huge memory for the bulky IDE while we are busy on other stuffs).

Sometimes we need to build our Java projects from outside Eclipse IDE, by executing an Ant build script from command line.