Apache Ant java.lang.NoClassDefFoundError

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My problem is same as described in the above thread.I went throught the solution and its not working. ant compile working perfectly. ant jar saying cant load the main class

Exception in thread "main" java.lang.NoClassDefFoundError: LoadServer (wrong name: org/module/loader/LoadServer)
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:791)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
    at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
    at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:482)

I did the following in commnad line

JAVA_HOME="/usr/local/java/jdk1.7.0_21"
ANT_HOME="/usr/share/ant/"
PATH="$ANT_HOME/bin:$PATH"

Morever if I start a new terminal and type echo$JAVA_HOME its showing the above result but echo$ANT_HOME is giving null.

here is a screen shot

Initial Error

     <project name="Raxa-4" basedir="." default="main">

    <property name="src.dir"      value="src"/>
    <property name="prop.dir"     value="properties"/>
    <property name="resource.dir" value="resource"/>
    <property name="lib.dir"      value="lib"/>
    <property name="build.dir"    value="build"/>
    <property name="classes.dir"  value="${build.dir}/classes"/>
    <property name="jar.dir"      value="${build.dir}/jar"/>
    <property name="main-class"   value="org.raxa.module.loader.LoadServer"/>

    <path id="classpath">
            <fileset dir="${lib.dir}" includes="**/*.jar"/>
    </path>

    <target name="clean">
        <delete dir="${build.dir}"/>
    </target>

    <target name="compile">
        <mkdir dir="${classes.dir}"/>
        <javac srcdir="${src.dir}" destdir="${classes.dir}" classpathref="classpath" includeantruntime="false" />
        <copy todir="${classes.dir}">
            <fileset dir="${resource.dir}" excludes="**/*.java"/>
            <fileset dir="${prop.dir}" excludes="**/*.java"/>
        </copy>
    </target>

   <target name="jar" depends="compile">
        <mkdir dir="${jar.dir}"/>
         <classpath>
            <path refid="classpath"/>
            <path location="${jar.dir}/${ant.project.name}.jar"/>
        </classpath>
        </jar>
    </target>


    <target name="run" depends="jar">
        <java jar="${jar.dir}/${ant.project.name}.jar" fork="true"/>

    </target>

    <target name="clean-build" depends="clean,jar"/>

    <target name="main" depends="clean,run"/>

</project>

Edited:

    <property name="src.dir"      value="src"/>
    <property name="prop.dir"     value="properties"/>
    <property name="resource.dir" value="resource"/>
    <property name="lib.dir"      value="lib"/>
    <property name="build.dir"    value="build"/>
    <property name="classes.dir"  value="${build.dir}/classes"/>
    <property name="jar.dir"      value="${build.dir}/jar"/>
    <property name="main-class"   value="org.raxa.module.loader.LoadServer"/>

    <path id="classpath">
            <fileset dir="${lib.dir}" includes="**/*.jar"/>
    </path>

    <target name="clean">
        <delete dir="${build.dir}"/>
    </target>

    <target name="compile">
        <mkdir dir="${classes.dir}"/>
        <javac srcdir="${src.dir}" destdir="${classes.dir}" classpathref="classpath" includeantruntime="false" />
        <copy todir="${classes.dir}">
            <fileset dir="${resource.dir}" excludes="**/*.java"/>
            <fileset dir="${prop.dir}" excludes="**/*.java"/>
        </copy>
    </target>

   <target name="jar" depends="compile">
        <mkdir dir="${jar.dir}"/>
        <jar destfile="${jar.dir}/${ant.project.name}.jar" basedir="${classes.dir}">
            <manifest>
                <attribute name="Main-Class" value="${main-class}"/>
            </manifest>
        </jar>
    </target>


    <target name="run" depends="jar">
        <java jar="${jar.dir}/${ant.project.name}.jar" fork="true"/>
        <classpath>
            <path refid="classpath"/>
            <path location="${jar.dir}/${ant.project.name}.jar"/>
        </classpath>
    </target>

    <target name="clean-build" depends="clean,jar"/>

    <target name="main" depends="clean,run"/>

</project>

NEW ERROR on ant run

run:

[java] Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/log4j/Logger
 [java]     at org.raxa.module.scheduler.TimeSetter.<clinit>(Unknown Source)
 [java]     at org.raxa.module.loader.LoadServer.main(Unknown Source)
 [java] Caused by: java.lang.ClassNotFoundException: org.apache.log4j.Logger
 [java]     at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
 [java]     at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
 [java]     at java.security.AccessController.doPrivileged(Native Method)
 [java]     at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
 [java]     at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
 [java]     at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
 [java]     at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
 [java]     ... 2 more
 [java] Java Result: 1

BUILD FAILED
/home/atul/Documents/workspace2/Raxa-4/build.xml:41: Problem: failed to create task or type classpath
Cause: The name is undefined.
Action: Check the spelling.
Action: Check that any custom tasks/types have been declared.
Action: Check that any <presetdef>/<macrodef> declarations have taken pla

Answer 1

Maybe the problem is that your classpath gets overriden. Try this one:

<java classname="${main-class}" fork="true" >
  <classpath>
    <path refid="classpath"/>
    <pathelement location="${jar.dir}/${ant.project.name}.jar"/>
  </classpath>
</classpath> </java>