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    <p>Uber JAR, in short, is a JAR containing everything.</p> <p>Normally in Maven, we rely on dependency management. An artifact contains only the classes/resources of itself. Maven will be responsible to find out all artifacts (JARs etc) that the project depending on when the project is built.</p> <p>An uber-jar is something that take all dependencies, and extract the content of the dependencies and put them with the classes/resources of the project itself, in one big JAR. By having such uber-jar, it is easy for execution, because you will need only one big JAR instead of tons of small JARs to run your app. It also ease distribution in some case.</p> <p>Just a side-note. Avoid using uber-jar as Maven dependency, as it is ruining the dependency resolution feature of Maven. Normally we create uber-jar only for the final artifact for actual deployment or for manual distribution, but not for putting to Maven repository.</p> <hr> <p>Update: I have just discovered I haven't answered one part of the question : "What's the point of renaming the packages of the dependencies?". Here is some brief updates and hopefully will help people having similar question.</p> <p>Creating uber-jar for ease of deployment is one use case of shade plugin. There are also other common use cases which involve package renaming.</p> <p>For example, I am developing <code>Foo</code> library, which depends on a specific version (e.g. 1.0) of <code>Bar</code> library. Assuming I cannot make use of other version of <code>Bar</code> lib (because API change, or other technical issues, etc). If I simply declare <code>Bar:1.0</code> as <code>Foo</code>'s dependency in Maven, it is possible to fall into a problem: A <code>Qux</code> project is depending on <code>Foo</code>, and also <code>Bar:2.0</code> (and it cannot use <code>Bar:1.0</code> because <code>Qux</code> needs to use new feature in <code>Bar:2.0</code>). Here is the dilemma: should <code>Qux</code> use <code>Bar:1.0</code> (which <code>Qux</code>'s code will not work) or <code>Bar:2.0</code> (which <code>Foo</code>'s code will not work)?</p> <p>In order to solve this problem, developer of <code>Foo</code> can choose to use shade plugin to rename its usage of <code>Bar</code>, so that all classes in <code>Bar:1.0</code> jar are embedded in <code>Foo</code> jar, and the package of the embedded <code>Bar</code> classes is changed from <code>com.bar</code> to <code>com.foo.bar</code>. By doing so, <code>Qux</code> can safely depends on <code>Bar:2.0</code> because now <code>Foo</code> is no longer depending on <code>Bar</code>, and it is using is own copy of "altered" <code>Bar</code> located in another package.</p>
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    1. POWhat is the maven-shade-plugin used for, and why would you want to relocate Java packages?
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    1. USAdrian Shum
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    1. POWhat is the maven-shade-plugin used for, and why would you want to relocate Java packages?
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    1. COThanks, that helps a lot. Is it called "shading" because it conceals the dependencies and other jars inside the uber-jar?
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      1. USnonbeing
    2. COI am not really sure about the reason behind of name, but from its front page, it seems suggests the "shading" is describing the "hiding" of dependencies. As you can optionally includes some dependencies in the shaded JAR, shade plugin will also generate a correct POM for you which remove the included dependencies. It seems that shading is describing this process
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