Errors running builder 'Maven Project Builder' on project 'XXX'

           今天在Eclipse的Juno和Mars版本中，去执行Maven -> Update Project的时候出现了一个错误：

Errors occurred during the build. Errors running builder 'Maven Project Builder' on project 'xxx'.

以及

java.lang.NullPointerException

Errors running builder 'Maven Project Builder' on project 'xxx'. java.lang.NullPointerException

 

经排查后发现原因是由于这两个eclipse版本中已经自带了m2e的插件，而我刚刚自己又安装了m2e插件，冲突引起来的。在eclipse的Help - > Install Software中点击如下图所示的What is already installed?即可将已安装的m2e插件删除。