build.xml

   <project name="mainVison" basedir="." default="rebuild-run">

       <property name="name.project"     value="mainVison"/>
       <property name="src.dir"     value="src"/>

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

       <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="${name.project}"/>


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

       <target name="compile">
           <mkdir dir="${classes.dir}"/>
           <javac includeantruntime="false" srcdir="${src.dir}" destdir="${classes.dir}" classpathref="classpath"/>
       </target>

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

       <target name="run" depends="jar">
           <java fork="true" classname="${main-class}">
           <jvmarg value="-Djava.library.path='${libJNI.dir}" />
               <sysproperty key="java.library.path" path="${libJNI.dir}"/>
               <classpath>
                   <path refid="classpath"/>
                   <path location="${jar.dir}/${ant.project.name}.jar"/>
               </classpath>
           </java>
       </target>

       <target name="rebuild" depends="clean,jar"/>

       <target name="rebuild-run" depends="clean,run"/>

   </project>