运行 cobertura-maven-plugin 异常，求助

[yukjin]

Failed to execute goal org.codehaus.mojo:cobertura-maven-plugin:2.7:instrument (default-cli) on project com.bj58.opt.lianmeng.union.management: Execution default-cli of goal org.codehaus.mojo:cobertura-maven-plugin:2.7:instrument failed: A required class was missing while executing org.codehaus.mojo:cobertura-maven-plugin:2.7:instrument: net/sourceforge/cobertura/instrument/InstrumentMain

具体异常信息如上