早上打开myEclipse就会报 Errors running builder 'DeploymentBuilder' on project '工程名' xxxNullpointException 的错误。找了半天，也没有解决方法。终于找到一个看似靠谱的博客 http://5666522.blog.51cto.com/5656522/1238898 解决了该问题
解决方法如下：
1、首先关闭MyEclipse工作空间。
2、然后删除工作空间下的
“/.metadata/.plugins/org.eclipse.core.runtime/.settings/com.genuitec.eclipse.ast.deploy.core.prefs”
这个文件。在这个文件中存储了一些部署项目的信息。删了这个部署的项目的信息就没有错误了。
3、重启启动MyEclipse即可解决了。
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