一大早上來啟動打開myeclipse就報一個這樣的錯誤An internal error occurred during: "Launching MVC on Tomcat 6.x".
java.lang.NullPointerException
我記得之前好像也出個這類似的錯誤，但是好像重裝了。這次看到一個方法，挺簡單，挺方便，給大家分享下。
處理方法：
如果出現了上述的錯誤按照如下的3個步驟解決：
1、首先關閉MyEclipse工作空間。
2、然后刪除工作空間下的
“/.metadata/.plugins/org.eclipse.core.runtime/.settings/com.genuitec.eclipse.ast.deploy.core.prefs”
這個文件。在這個文件中存儲了一些部署項目的信息。刪了這個部署的項目的信息就沒有錯誤了。
3、重啟啟動MyEclipse即可解決了。
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如圖所示：
錯誤報告：
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.handlers.ShowViewHandler.openView(ShowViewHandler.java:145)
at org.eclipse.ui.handlers.ShowViewHandler.execute(ShowViewHandler.java:76)
at org.eclipse.ui.internal.handlers.HandlerProxy.execute(HandlerProxy.java:293)