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POSimple ant file for java "hello world"
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  1. POSimple ant file for java "hello world"
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    copied!<p>I'm trying to run ant file and I keep getting the following error: </p> <pre><code>Exception in thread "main" java.lang.NoClassDefFoundError </code></pre> <p>My build.xml file contains this:</p> <pre><code>&lt;project name="Proj0" default="compile" basedir="."&gt; &lt;description&gt; Proj0 build file &lt;/description&gt; &lt;!-- global properties for this build file --&gt; &lt;property name="source.dir" location="src"/&gt; &lt;property name="build.dir" location="bin"/&gt; &lt;property name="doc.dir" location="doc"/&gt; &lt;property name="main.class" value="proj0.Proj0.java"/&gt; &lt;!-- set up some directories used by this project --&gt; &lt;target name="init" description="setup project directories"&gt; &lt;mkdir dir="${build.dir}"/&gt; &lt;mkdir dir="${doc.dir}"/&gt; &lt;/target&gt; &lt;!-- Compile the java code in ${src.dir} into ${build.dir} --&gt; &lt;target name="compile" depends="init" description="compile java sources"&gt; &lt;javac srcdir="${source.dir}" destdir="${build.dir}"/&gt; &lt;/target&gt; &lt;!-- execute the program with the fully qualified name in ${build.dir} --&gt; &lt;target name="run" description="run the project"&gt; &lt;java dir="${build.dir}" classname="${main.class}" fork="yes"&gt; &lt;arg line="${args}"/&gt; &lt;/java&gt; &lt;/target&gt; &lt;!-- Delete the build &amp; doc directories and Emacs backup (*~) files --&gt; &lt;target name="clean" description="tidy up the workspace"&gt; &lt;delete dir="${build.dir}"/&gt; &lt;delete dir="${doc.dir}"/&gt; &lt;delete&gt; &lt;fileset defaultexcludes="no" dir="${source.dir}" includes="**/*~"/&gt; &lt;/delete&gt; &lt;/target&gt; &lt;!-- Generate javadocs for current project into ${doc.dir} --&gt; &lt;target name="doc" depends="init" description="generate documentation"&gt; &lt;javadoc sourcepath="${source.dir}" destdir="${doc.dir}"/&gt; &lt;/target&gt; &lt;/project&gt; </code></pre> <p>How do I resolve this error?</p> <p><strong>EDIT: This is what my Proj0.java file and stack trace look like:</strong></p> <pre><code>package proj0; public class Proj0 { public static void main(String[] args) { System.out.println("Hello World"); } } </code></pre> <hr> <pre><code>Buildfile: build.xml run: [java] Exception in thread "main" java.lang.NoClassDefFoundError: proj0/Proj0 [java] Caused by: java.lang.ClassNotFoundException: proj0.Proj0 [java] at java.net.URLClassLoader$1.run(URLClassLoader.java:217) [java] at java.security.AccessController.doPrivileged(Native Method) [java] at java.net.URLClassLoader.findClass(URLClassLoader.java:205) [java] at java.lang.ClassLoader.loadClass(ClassLoader.java:321) [java] at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294) [java] at java.lang.ClassLoader.loadClass(ClassLoader.java:266) [java] Could not find the main class: proj0.Proj0. Program will exit. [java] Java Result: 1 BUILD SUCCESSFUL Total time: 0 seconds </code></pre>
 

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