ANT executer ant avec java

Build.xml:

Code:

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<?xml version="1.0"?> 
<project name="MigrateToDerby" > 
 <path id="classpath">
 <fileset dir="C:\Program Files\Java\ant\apache-ant-1.7.1\bin\lib">
 <include name="**/*.jar"/>
 </fileset>  </path> 
 <target name="export-source-db" description="Dumps db structure and data"> 
 <taskdef name="databaseToDdl" classname="org.apache.ddlutils.task.DatabaseToDdlTask"> 
 <classpath refid="classpath"/>  
 </taskdef>
 <databaseToDdl modelName="MigrateTest"> 
 <database url="**************************" driverClassName="org.apache.derby.jdbc.ClientDriver" username="" password=""/> 
 <writeSchemaToFile outputFile="schema.xml"/> 
 </databaseToDdl>  
 </target>
 </project>

j'utilise Ant1.7 et je veux executer ant à partir d'une classe java
Merci de vos aides!