Myeclipse错误:Errors occurred during the build. Errors running builder 'Deployment

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

First, the solution:
close the MyEclipse workspace (that is, The workspace where you made an error).
Delete "/.metadata/.plugins/org.eclipse.core.runtime/.settings/com.genuitec.eclipse.ast.deploy.core.prefs" under the workspace

2. Prevent it from happening again
Cancel the automatic deployment of myeclipse: Click Right-click on the project -> properties -> Builders, check and remove DeploymentBuilder.




Reference: http://www.cnblogs.com/Shock-W/p/5814306.html