Suppose you are working on a big project, which is run on some application server (let's say Tomcat, but it may be also Jboss, or Jetty, or something else). The project consists of a several wars, while each war contains a lot of jar. The whole thing is built using Maven and it takes a lot of time to build it all.
Now, suppose a developer makes a change in just one module that produces one small jar. To continue working and test the change, the developer needs to replace this jar in the relevant wars and restart server (sometimes it's sufficient to redeploy wars). It's much faster then rebuilding the whole application.
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