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    <p><strong>Easy</strong></p> <pre><code>import com.example.*; </code></pre> <p><strong>Possible</strong></p> <pre><code>List&lt;com.example.MyType&gt; = new ArrayList&lt;com.example.MyType&gt;(); </code></pre> <p><strong>A challenge</strong></p> <pre><code>Class&lt;?&gt; clazz = Class.forName("com.example.MyType"); </code></pre> <p><strong>Mission impossible</strong></p> <pre><code>List&lt;String&gt; classes = getClassNamesFromUrl("http://example.com/classes.txt"); for (String className:classes) { doSomethingWith(Class.forName(className)); } </code></pre> <p>I support Jon's advice to look at the byte code (BCEL) but just be aware, that in general it is not possible to read all dependencies from a jar, as they can be dynamic and defined outside the library (see: Mission impossible).</p> <hr> <p>Hard to tell if there's a tool, have a look at those directories on <a href="http://java-source.net/" rel="nofollow noreferrer">java-source.net</a>:</p> <ul> <li><a href="http://java-source.net/open-source/bytecode-libraries" rel="nofollow noreferrer">Open Source ByteCode Libraries in Java</a></li> <li><a href="http://java-source.net/open-source/code-analyzers" rel="nofollow noreferrer">Open Source Code Analyzers in Java</a> (has some applications to work on jars too, like JDepend. JarAnalyzer sounds promising too, but it is quite old, last update in 2005)</li> </ul> <p><strong>Further reading</strong></p> <ul> <li><a href="https://stackoverflow.com/questions/972087/how-can-i-visualize-jar-not-plugin-dependencies">How can I visualize jar (not plugin) dependencies?</a> (especially <a href="https://stackoverflow.com/questions/972087/how-can-i-visualize-jar-not-plugin-dependencies/972193#972193">VonC's answer</a>)</li> </ul>
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    1. POhow to know which class / package/ methods used by given jar file?
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    1. COI want to try this with J2ME application. "Possible" case is enough for me. Any tools?
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    2. CO+1 for the nice examples. The "Mission impossible" is neat.
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    3. COI would like to create a plugin system, that allows limited functionality for the plugin. So limited that not the excluded, but the allowed classes and methods can be listed. Besides simple types, collections and classes defined in the JAR nothing else can be used, not even Class, to avoid reflection tricks. What would be the best method to check the JAR containing the plugin, or the source code of the plugin?
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