use the gpd and create a new project. You'll see an example.

I created new process according the gpd, including actionHandler file (java files) but I don't know where I should put java files when I want to deploy by ant. I saw only updated position of .par in build.deploy.xml.

<target name="deploy.processes" depends="declare.jbpm.tasks" description="deploys the jbpm processes">
 <ant antfile="build.xml" target="build.processes" inheritall="false" />
 <deploypar properties="src/resources/hsqldb/create.db.hibernate.properties">
 <fileset dir="build" includes="*.par" />
 </deploypar>
 </target>

I did not say to just look at the ant files, but at the example as well. There is a directory which contains one java class (messageaction if I'm right) so that is one clue. If you then look in the ant code you posted, you'll see a dependency on BUILD.PROCESSES in the BUILD.XML file. Take a look there and you'll be surprised.

Besides this, I feel less and less obliged to reply to your posts. You seem to lack a basic knowledge of java, j2ee and likely (but you do not seem to have gotten that far) bpm. In total I think my responses to you took more that half a day. spare, free leisure time that is. Commercial tarifs would have been around the ?500,- (not that I want that ;-) cause I like helping people out. But it could have been spent playing golf, preparing my snowboard or other useless things. But these get more and more appealing by the minute.

I hope I have not offended you, but do not expect to many responses from me anymore on questions like the ones you posted.