问题描述：

Errors occurred during the build. Errors running builder 'DeploymentBuilder' on project 'myf'. java.lang.NullPointerException

问题分析：

此问题一般发生在Myeclipse 保存文件并自动部署时候。本人在写项目的时候，还没等部署好，关闭了了myeclipse
10，结果出现了这种情况。有一种产生此错误的原因是因为此项目不不是由myeclipse创建的，需要检查.project
文件，并且添加com.genuitec.eclipse.j2eedt.core.webnature。

解决方法：

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”

取消myeclipse的自动部署:
右键点击项目 ->properties -> Builders,将DeploymentBuilder勾选去除.

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