An internal error occurred during: "Launching 项目名 on MyEclipse Tomcat ". java.lang.NullPointerExcept
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用myeclipse10打开和运行tomcat部署项目都出现这个问题，网上研究后发现问题解决方法为：
如果出现了上述的错误按照如下的3个步骤解决：
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。
为csdn上一大神提供，链接：http://bbs.csdn.net/topics/390588732?page=1 特此感谢
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