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    <pre><code>Could not find the main class: MyClass </code></pre> <p>The error seems actually related to your <code>MANIFEST</code> which:</p> <ul> <li>may not have a complete classpath <code>Class-Path</code>: see <a href="http://www.rgagnon.com/javadetails/java-0587.html" rel="nofollow noreferrer">this HowTo</a></li> </ul> <blockquote> <p>The best solution when you have a jar is to try to include the required jars into the manifest declaration.</p> </blockquote> <pre><code>Manifest-Version: 1.0 Class-Path: customer_client.jar mailer_client.jar signon_client.jar </code></pre> <ul> <li>or may not define adequately the MainClass within your 'my_jar.jar'. </li> </ul> <p>See <a href="http://www.rgagnon.com/javadetails/java-0532.html" rel="nofollow noreferrer">this HowTo</a>:</p> <pre><code>&lt;target name="jar" depends="compile"&gt; &lt;delete file="hello.jar"/&gt; &lt;delete file="MANIFEST.MF"/&gt; &lt;manifest file="MANIFEST.MF"&gt; &lt;attribute name="Built-By" value="${user.name}"/&gt; &lt;attribute name="Main-Class" value="howto.Hello"/&gt; &lt;/manifest&gt; &lt;jar destfile="hello.jar" basedir="." includes="**/*.class" manifest="MANIFEST.MF" /&gt; &lt;/target&gt; </code></pre> <p>the <code>&lt;attribute name="Main-Class" value="howto.Hello"/&gt;</code> needs to specify the full path (packages) of the <code>MainClass</code>, not just <code>MainClass</code>.</p> <p>If your main class is in the default package (the <a href="http://java.sun.com/docs/books/jls/second_edition/html/packages.doc.html#26639" rel="nofollow noreferrer">unnamed package</a>), I am not sure it can be referenced by the loader (see this <a href="https://stackoverflow.com/questions/859603/java-is-there-a-tool-to-make-code-in-a-3rd-party-jar-forward-compatible-1-4">SO question</a>)<br> So move your <code>JarRunner</code> into a package, and declare it appropriately in the <code>&lt;attribute name="Main-Class" value="myPackage.JarRunner"/&gt;</code> element.</p>
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    1. POjava.lang.ClassNotFoundException when running java -jar
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    1. COThe main class is declared as class JarRunner and is in JarRunner.java in the same directory as build.xml. In my manifest, the attribute looks like: attribute name="Main-Class" value="JarRunner"/> Is this wrong?
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    2. COI would recommend at least one package to put `JarRunner` into, instead of the "unnamed package"
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    3. COIf I add my java files to a package and then specify the MainClass as mypackage.JarRunner it still can't find the class. Is this the right thing?
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      1. USHeinrich Schmetterling
 

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