Here is the way to do it
classname: is filename of java :Ex: AutomationFileSequence
arg: Any arguments if required to run the class needs to be mentioned here.
<target name="run_PostData" >
<java fork="false" failonerror="yes" classname="com.qa.automation.main.AutomationFileSequence" classpathref="classpath">
<arg line="${basedir}/Automation_PostData.properties"/>
<arg line="PostData"/>
</java>
</target>
classname: is filename of java :Ex: AutomationFileSequence
arg: Any arguments if required to run the class needs to be mentioned here.
<target name="run_PostData" >
<java fork="false" failonerror="yes" classname="com.qa.automation.main.AutomationFileSequence" classpathref="classpath">
<arg line="${basedir}/Automation_PostData.properties"/>
<arg line="PostData"/>
</java>
</target>