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    <p>For background information, see this related question: <a href="https://stackoverflow.com/questions/3213510/what-is-a-manifest-in-scala-and-when-do-you-need-it">What is a Manifest in Scala and when do you need it?</a>. In this answer, you will find an explanation why manifests are needed for arrays.</p> <p>In short: Although the JVM uses type erasure, arrays are an exception and need a manifest. Since you could compile your code, that manifest was found (manifests are always available for proper types). Your error occurs at runtime.</p> <p>I don't know the details of the battlecode server, but there are two possibilities: Either you are running your compiled classes with a binary <strong>incompatible version</strong> of Scala (difference in major version, e.g. compiled with Scala 2.9 and server uses 2.10). Or the server doesn't even have the <strong>scala-library.jar</strong> on its class path.</p> <p>As said in the comment, manifests are deprecated in Scala 2.10 and replaced by <code>ClassTag</code>.</p> <hr> <p><strong>EDIT</strong>: So it seems the class loader is artificially restricting the allowed classes. My suggestion would be: Add a helper Java class. You can easily mix Java and Scala code. If it's just about the <code>Int</code>-<code>Array</code> instantiation, you could provide something like:</p> <pre><code>public static class Helper { public static int[][] makeArray(int d1, int d2) { return new int[d1][d2](); } } </code></pre> <p>(hope that's valid java code, a bit rusty)</p> <p>Also, have you tried to create the outer array with <code>new Array[Array[Int]](d1)</code>, and then iterate to create the inner arrays?</p>
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    1. POWhy does Array.fill take an implicit scala.reflect.ClassManifest?
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    1. COThe battlecode server has Scala 2.9 and everything is compatible. The problem is that according to the battlecode rule set you're _not allowed_ to use instances of certain classes. Use of any classes that would give you an opportunity to exploit the game are detected and an exception thrown.
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    2. COLooking at the battlecode page, they seem to use Scala 2.9.1; they say you should include both scala-compiler.jar (for whatever reason?) and scala-library.jar; did you do that?
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    3. COYeah, I misspoke in my question (edited). The system version I have installed is 2.9.2 but the version being used by battlecode is 2.9.1.
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