Apache Ant + JUnit = Error?

Error Message:

[junit] The ' characters around the executable and arguments are
[junit] not part of the command.

There are so many java.lang.ClassNotFoundException exceptions!

Solution: (does not fit all)
To solve it, we should put the compiled Java classes in JUnit's classpath, say

<junit>
    <classpath>
        <pathelement location="${classes.dir}"/> 
    </classpath>
</junit>

The whole picture is that:

<path id="test.classpath">
    <path refid="classpath" />
    <fileset dir="${test.dir}/lib" />
</path>

<target name="test.compile">
    <javac srcdir="${test.dir}" encoding="UTF-8" destdir="${classes.dir}" 
        includeantruntime="false" debug="true">
        <classpath>
            <path refid="test.classpath" />
        </classpath>
        <include name="**/*.java" />
    </javac>
      
    <copy todir="${classes.dir}">
        <fileset dir="${test.dir}">
            <exclude name="**/*.java"/>
        </fileset>
    </copy>
</target>

<target name="junit" depends="compile,test.compile">
    <junit printsummary="yes">
        <formatter type="plain" usefile="false"/>
        <classpath>
            <path refid="test.classpath" />
            <pathelement location="${classes.dir}"/> 
        </classpath>
          
        <batchtest fork="yes">
            <fileset dir="${classes.dir}" includes="**/*Test.class"/>
        </batchtest>
    </junit>
</target>

Enjoy!