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  Tutorial: Jarpend

The goal of the Jarpend Project is to provide tools concerning dependency checking for Java. It provides a tool called jarpend, that allows you to test whether a certain classpath fulfills the requirements of a given set of classes and to build a JAR fil

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The jar creation feature is especially useful in situations when bandwidth is a concern, e.g. applets. Imagine an applet using only some classes provided in a huge jar with hundreds or more classes. On the one hand you could put all classes from the library jar into your applet jar, creating a very big applet, that is almost impossible to use with a slow connection. On the other hand you could try to determine the necessary classes and put them into your applet jar by yourself. A complicated and boring task for a human. Or you could use Jarpend, doing the dirty work for you, every time you build your app.

The validation feature is interesting for people deploying applications consisting of multiple jars. If only one of them is missing or not up to date, some class might have been forgotten. A bug that would only appear at runtime, crashing the whole application.
Java and provides a jar like command line interface and ant task, so it can be smoothly integrated into Ant build files.


 

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