Problem: failed to create task or type cobertura-report Cause: The name is undefined.

BUILD FAILED
/opt/build.xml:19: Problem: failed to create task or type cobertura-report
Cause: The name is undefined.
Action: Check the spelling.
Action: Check that any custom tasks/types have been declared.
Action: Check that any <presetdef>/<macrodef> declarations have taken place.

解决办法：设置jar的引入路径：

第一步，将cobertura.jar以及Cobertura/lib下的所有jar引入classpath

1. <pathid="lib.classpath">
2. <filesetdir="${lib.dir}">
3. <includename="**/*.jar"/>
4. </fileset>
5. </path>

注：lib.dir是你存放cobertura.jar以及/Conbertura/lib/*.jar的地方

第二步，将cobertura自身定义的task引入到ant脚本中

1.<taskdefclasspathref="lib.classpath"resource="tasks.properties"/>