The Ant target for starting a WebLogic server is:
build startserver
and requires the following option:
The name of the server to be started.
The following parameter is optional and is only needed where the CuramMBean.jar file has been placed in a directory other than the default <WebLogic Server Install directory>/weblogic/server/lib/mbeantypes (<WebLogic Server Install directory>/wlsserver_10.3/server/lib/mbeantypes for 10.3.3) or the /domaindir/lib/mbeantypes directory, (where domaindir represents the location of your domain.)
The location of the CuramMBean.jar
build startserver -Dserver.name=CuramServer
build startserver -Dserver.name=CuramServer -Dweblogic.alternateMbeanTypesDir=C:\MyWeblogicMBeansDir