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    <p><code>Exception java.lang.NoClassDefFoundError</code> occurs when some class, yours or in a library your code depends on, try to use a symbol not already loaded. The class loader use the java path <code>package_aa.package_bb.SomeClass</code> as a key into the set of of classes it knows, specified by -classpath or -cp. In your case this "repository is <code>bin, libthrift-1.0.0-javadoc.jar, libthrift-1.0.0.jar, log4j-1.2.14.jar, slf4j-api-1.5.8.jar, slf4j-log4j12-1.5.8.jar</code>.</p> <p>In your context, when the class p1.p2.Client is about to be loaded, the classloader looks for bin/p1/p2/Client.class, look for /p1/p2/Client.class into each jar and when all the search paths are exhausted, the exception is thrown.</p> <p>In this part of your build.xml :</p> <pre><code>&lt;target name="jar" depends="init"&gt; &lt;mkdir dir="build/jar" /&gt; &lt;jar destfile="client.jar" basedir="bin"&gt; &lt;manifest&gt; &lt;attribute name="Main-Class" value="src.Client" /&gt; &lt;/manifest&gt; &lt;/jar&gt; &lt;/target&gt; </code></pre> <p><code>value="src.Client"</code> is wrong, it should be the logical java path i.e. the package + the class name. src is a directory not a package. If you haven't any package, it's just classname.</p> <p>I presume</p> <pre><code>&lt;attribute name="Main-Class" value="Client" /&gt; </code></pre> <p>That should do the trick.</p> <p>Reference:</p> <ul> <li><a href="http://ant.apache.org/manual/Tasks/jar.html" rel="nofollow">Apache ANT Manual for Jar task</a>.</li> <li><a href="http://docs.oracle.com/javase/7/docs/technotes/tools/windows/jar.html#entrypoint" rel="nofollow">Oracle Jar Tools Manual (entry point)</a></li> </ul> <p><strong>EDIT</strong> after first debug, the second error appears:</p> <pre><code>&lt;target name="run" depends="jar"&gt; &lt;java jar="client.jar" fork="true"&gt; &lt;/java&gt; &lt;/target&gt; </code></pre> <p>Can't work because Client.jar is not autonomous, it requires a lot of depndencies, which aren't specified here. You should use the classpath ref defined on top of your build.xml.</p> <p>It <em>may be</em> wrote as:</p> <pre><code>&lt;target name="run" depends="jar"&gt; &lt;java classpathref="client.classpath" fork="true" classname="Client" /&gt; &lt;/target&gt; </code></pre>
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    1. COUmmm.... Its not working....
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