In http://tomcat.apache.org/tomcat-7.0-doc/appdev/build.xml.txt , referenced from http://tomcat.apache.org/tomcat-7.0-doc/appdev/processes.html sample manager.url is given as "http://localhost:8080/manager" but should be "http://localhost:8080/manager/text"
Thanks for the report. Fixed in 7.0.x and will be included in 7.0.7 onwards.