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copied!<p>Source control systems are designed for holding the text source code. They <em>can</em> hold binary files, but that isn't really what they are designed for. In some cases it makes sense to put a binary file in source control, but java dependencies are generally better managed in a different way.</p> <p>The ideal setup is one that lets you manage your dependencies outside of source control. You should be able to manage your dependencies outside of the source and simply "point" to the desired dependency from within the source. This has several advantages:</p> <ul> <li>You can have a number of projects dependent on the same binaries without keeping a separate copy of each binary. It is common for a medium sized project to have hundreds of binaries it depends on. This can result in a great deal of duplication which wastes local and backup resources.</li> <li>Versions of binaries can be managed centrally within your local environment or within the corporate entity.</li> <li>In many situations, the source control server is not a local resource. Adding a bunch of binary files will slow things down because it increases the amount of data that needs to be sent across a slower connection.</li> <li>If you are creating a war, there may be some jars you need for development, but not deployment and vice versa. A good dependency management tool lets you handle these types of issues easily and efficiently.</li> <li>If you are depending on a binary file that comes from another one of your projects, it may change frequently. This means you could be constantly overwriting the binary with a new version. Since version control is going to keep every copy, it could quickly grow to an unmanageable size--particularly if you have any type of continuous integration or automated build scripts creating these binaries.</li> <li>A dependency management system offers a certain level of flexibility in how you depend on binaries. For example, on your local machine, you may want to depend on the latest version of a dependency as it sits on your file system. However, when you deploy your application you want the dependency packaged as a jar and included in your file.</li> </ul> <p>Maven's dependency management features solve these issues for you and can help you locate and retrieve binary dependencies as needed. Ivy is another tool that does this as well, but for Ant.</p>

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