Execute a jar file using Ant - ant

Question

I am trying to create a runnable jar file from java classes using ant. The java classes use external jars. When I execute the build.xml its showing class not found exception while running the java program. Its compiling fine.
Part of My source code:
<path id="project-libpath">
<fileset dir="${lib.dir}">
<include name="*.jar"/>
</fileset>
</path>
<path id="project-classpath">
<fileset dir="C:/xmldecode/lib">
<include name="*.jar"/>
</fileset>
</path>
<target name="compile" depends="prepare">
<javac srcdir="${src.dir}" destdir="${classes.dir}">
<classpath refid="project-classpath"/>
</javac>
</target>
<target name="jar" depends="compile">
<copy todir="${classes.dir}">
<fileset dir="C:/xmldecode/lib"/>
</copy>
<pathconvert property="mf.classpath" pathsep=";">
<path refid="project-classpath" />
<flattenmapper />
</pathconvert>
<jar destfile="${jar.dir}/${ant.project.name}.jar" basedir="${classes.dir}">
<manifest>
<attribute name="Main-Class" value="${main-class}"/>
<attribute name="Class-Path" value="${mf.classpath}"/>
</manifest>
</jar>
</target>
<target name="run" depends="jar">
<java jar="${jar.dir}/${ant.project.name}.jar" fork="true">
</java>

Answer 1

Your problem is that the manifest classpath entries are not separated by a ";" character.
The following will work better I think:
<pathconvert property="mf.classpath" pathsep=" ">
<path refid="project-classpath" />
<flattenmapper />
</pathconvert>
Could I suggest using the new ANT task manifestclasspath ?
<manifestclasspath property="mf.classpath" jarfile="${jar.dir}/${ant.project.name}.jar">
<classpath refid="project-classpath" />
</manifestclasspath>
This powerful method will determine paths relative to the jar's location, for example if the jar's dependencies are located in a lib directory