执行单元测试时出现“Errors occurred during the build. Errors running builder 'Integrated External Tool Builder' on project 'xx'. The builder launch configuration could not be found.
The builder launch configuration could not be found.”提示，点击“确定”再次执行该junit测试，就不会出现这个问题，再次执行又出现，解决这个问题取消Builders设置里面的Invalid External Tool Builder选项即可，具体如下面所示：
选中“Invalid External Tool Builder”，然后点击“Remove”即可。
