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POAnt: NoClassDefFound exception
 

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  1. POAnt: NoClassDefFound exception
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    <p>I am developing a java project. My instructor wants us to strictly use apache ant for compilation. I knew nothing about it, and don't know about apache ant either. I have generated an ant buildfile and edited that for target "run", so that program will run after ant run command.</p> <p>I am getting following error,</p> <pre><code>Exception in thread "main" java.lang.NoClassDefFoundError: src/Client [java] Caused by: java.lang.ClassNotFoundException: src.Client [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: src.Client. Program will exit. </code></pre> <p>I think I have resolved all the target dependencies. But still this error persists.</p> <p>Can somebody help me? This is my ant build.xml</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8" standalone="no"?&gt; &lt;!-- WARNING: Eclipse auto-generated file. Any modifications will be overwritten. To include a user specific buildfile here, simply create one in the same directory with the processing instruction &lt;?eclipse.ant.import?&gt; as the first entry and export the buildfile again. --&gt; &lt;project basedir="." default="build" name="client"&gt; &lt;property environment="env"/&gt; &lt;property name="ECLIPSE_HOME" value="../../../../usr/lib/eclipse"/&gt; &lt;property name="debuglevel" value="source,lines,vars"/&gt; &lt;property name="target" value="1.6"/&gt; &lt;property name="source" value="1.6"/&gt; &lt;path id="client.classpath"&gt; &lt;pathelement location="bin"/&gt; &lt;pathelement location="libthrift-1.0.0-javadoc.jar"/&gt; &lt;pathelement location="libthrift-1.0.0.jar"/&gt; &lt;pathelement location="log4j-1.2.14.jar"/&gt; &lt;pathelement location="slf4j-api-1.5.8.jar"/&gt; &lt;pathelement location="slf4j-log4j12-1.5.8.jar"/&gt; &lt;/path&gt; &lt;target name="init"&gt; &lt;mkdir dir="bin"/&gt; &lt;mkdir dir="build"/&gt; &lt;copy includeemptydirs="false" todir="bin"&gt; &lt;fileset dir="src"&gt; &lt;exclude name="**/*.java"/&gt; &lt;/fileset&gt; &lt;/copy&gt; &lt;/target&gt; &lt;target name="clean"&gt; &lt;delete dir="bin"/&gt; &lt;/target&gt; &lt;target depends="clean" name="cleanall"/&gt; &lt;target depends="build-subprojects,build-project" name="build"/&gt; &lt;target name="build-subprojects"/&gt; &lt;target depends="init" name="build-project"&gt; &lt;echo message="${ant.project.name}: ${ant.file}"/&gt; &lt;javac debug="true" debuglevel="${debuglevel}" destdir="bin" source="${source}" target="${target}"&gt; &lt;src path="src"/&gt; &lt;classpath refid="client.classpath"/&gt; &lt;/javac&gt; &lt;/target&gt; &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; &lt;target description="Build all projects which reference this project. Useful to propagate changes." name="build-refprojects"/&gt; &lt;target description="copy Eclipse compiler jars to ant lib directory" name="init-eclipse-compiler"&gt; &lt;copy todir="${ant.library.dir}"&gt; &lt;fileset dir="${ECLIPSE_HOME}/plugins" includes="org.eclipse.jdt.core_*.jar"/&gt; &lt;/copy&gt; &lt;unzip dest="${ant.library.dir}"&gt; &lt;patternset includes="jdtCompilerAdapter.jar"/&gt; &lt;fileset dir="${ECLIPSE_HOME}/plugins" includes="org.eclipse.jdt.core_*.jar"/&gt; &lt;/unzip&gt; &lt;/target&gt; &lt;target description="compile project with Eclipse compiler" name="build-eclipse-compiler"&gt; &lt;property name="build.compiler" value="org.eclipse.jdt.core.JDTCompilerAdapter"/&gt; &lt;antcall target="build"/&gt; &lt;/target&gt; &lt;target name="Client"&gt; &lt;java classname="Client" failonerror="true" fork="yes"&gt; &lt;classpath refid="client.classpath"/&gt; &lt;/java&gt; &lt;/target&gt; &lt;target name="run" depends="jar"&gt; &lt;java jar="client.jar" fork="true"&gt; &lt;/java&gt; &lt;/target&gt; &lt;/project&gt; </code></pre> <p>Can anybody spot the mistake for me?</p>
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    1. COin the client.classpath add src path also. and try.
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