今天早上吃完早餐来公司上班，打开电脑，输入密码，123456。。。。。嗯……，再打开myeclipse，duang。。。duang。。。duang。。。。tomcat空指针异常，tmd我这暴脾气昨天还好好的今天就给我来这一套，搁我五年前那暴脾气，早就卸了你，时间成就了我的成熟，ok，不扯了，搞定这空指针异常是我义不容辞的责任；
附上异常日志：
java.lang.NullPointerException
at com.genuitec.eclipse.ast.deploy.core.Deployment.<init>(Unknown Source)
at com.genuitec.eclipse.ast.deploy.core.ModuleDeployment.<init>(Unknown Source)
at com.genuitec.eclipse.ast.deploy.core.WebDeployment.<init>(Unknown Source)
at com.genuitec.eclipse.ast.deploy.core.Deployment.create(Unknown Source)
at com.genuitec.eclipse.ast.deploy.core.DeploymentManager.loadFromPreferences(Unknown Source)
at com.genuitec.eclipse.ast.deploy.core.DeploymentManager.init(Unknown Source)
at com.genuitec.eclipse.ast.deploy.core.DeploymentManager.<init>(Unknown Source)
at com.genuitec.eclipse.ast.deploy.core.DeploymentManager.getDefault(Unknown Source)
at com.genuitec.eclipse.ast.deploy.core.ui.ServerTreeViewer$ServerTreeContentProvider.inputChanged(Unknown Source)
at org.eclipse.jface.viewers.ContentViewer.setInput(ContentViewer.java:276)
at org.eclipse.jface.viewers.StructuredViewer.setInput(StructuredViewer.java:1690)
at com.genuitec.eclipse.ast.deploy.core.ui.ServerTreeViewer.<init>(Unknown Source)
at com.genuitec.eclipse.ast.deploy.core.ui.ServerView.createPartControl(Unknown Source)
at org.eclipse.ui.internal.ViewReference.createPartHelper(ViewReference.java:375)
at org.eclipse.ui.internal.ViewReference.createPart(ViewReference.java:229)
at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:595)
at org.eclipse.ui.internal.PartPane.setVisible(PartPane.java:313)
这个问题的出现是在启动myeclipse之后出现的，这时还没有启动tomcat，因此可以排除tomcat中项目代码问题。应该是myeclipse在初始化工作空间workspace 的时候
出的问题，仔细看，发现有一条 at com.genuitec.eclipse.ast.deploy.core.Deployment.这个错误；
于是到工作空间下面的C:UsersAdministratorWorkspaces.metadata.pluginsorg.eclipse.core.runtime.settings目录下面找到了名称为com.genuitec.eclipse.ast.deploy.core.prefs的文件，打开文件一开，哈哈，原来里面都是原来的一些项目信息，怪不得会报java.lang.NullPointerException错误呢。果断将此文件删除，重启myeclipse10问题解决