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    <p>It's simple when you know where to look. Say your META-INF/MANIFEST.MF contains the line:</p> <pre><code>Main-Class: mypackage.MyMainFile </code></pre> <p>then the structure of the jar needs to be</p> <pre><code>META-INF/MANIFEST.MF mypackage/MyMainFile.class </code></pre> <p>where MyMainFile has to be in the proper package:</p> <pre><code>package mypackage; public class MyMainFile { public static void main(String[] args) { ... </code></pre> <p>Your error message is caused by MyMainFile being in the wrong place.</p> <p><strong>Edit:</strong> it's been a while since the last time i did that with ant, but i think you need something like this: a source file structure that reflects the package struture, say </p> <pre><code>src/main/java/mypackage/MyMainFile.java </code></pre> <p>and a directory to put the compiled class file into, say</p> <pre><code>target </code></pre> <p>(I'm using maven conventions here, ant doesn't care and you can use the (rightclick)->properties->Java Build path->Sources tab in eclipse to set the source dir to src/main/java and the target to target/classes). Then in ant, have a compile target that compiles from source to target:</p> <pre><code>&lt;target name="compile"&gt; &lt;mkdir dir="target/classes"/&gt; &lt;javac srcdir="src/main/java" destdir="target/classes"/&gt; &lt;/target&gt; </code></pre> <p>so that after <code>ant compile</code> you should see the class file in the target</p> <pre><code>target/classes/mypackage/MyMainFile.class </code></pre> <p>Then have a ant jar task that packages this:</p> <pre><code>&lt;target name="jar" depends="compile"&gt; &lt;jar destfile="target/MyJarFile.jar" basedir="target/classes"&gt; &lt;manifest&gt; &lt;attribute name="Main-Class" value="mypackage.MyMainFile"/&gt; &lt;/manifest&gt; &lt;/jar&gt; &lt;/target&gt; </code></pre> <p>After saying <code>ant compile jar</code> you should have a file MyJarFile.jar inside target and </p> <pre><code>java -jar MyJarFile.jar </code></pre> <p>should run the main method.</p>
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    1. COOK so how do I get ANT to give that type of structure in the JAR file? Or am I running ANt from the wrong location? (bear in mind that I am running the ANT task from within eclipse, not the CLI). And why is ANT creating the other type of directory structure (which is correct and how to specify one or the other, which I haven't found in the ANT docs... yet !
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    2. COwallenborn currently in my "compile" I am pointing to a a destfile="${class}" and class = "build" , so is this where my problem is?? I'm going to change it and see what happens...
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    3. COIn the compile task, destfile is probably too specific anyway. You basically only want to tell the compile task: take everything in this src directory, recursively, compile it, and write the resulting classes into that dest directory, preserving subdirectories.
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