Error: Closing myeclipse error when Web project is not successfully deployed in MyEclipse

Reference: http://www.phperz.com/article/14/1205/39544.html

Problem Description:

Errors occurred during the build. Errors running builder ' Deploymentbuilder ' on Project ' Myf '. Java.lang.NullPointerException

Cause Analysis:

This problem typically occurs when MyEclipse saves the file and automatically deploys it. I was writing the project, and did not wait to deploy, close the MyEclipse 10, the result of this situation. One reason for this error is because this project is not created by myeclipse, you need to check the. project file, and add Com.genuitec.eclipse.j2eedt.core.webnature.

Workaround:

1. First, close the myeclipse working space.
2. Then delete the "/.metadata/.plugins/org.eclipse.core.runtime/.settings/com.genuitec.eclipse.ast.deploy.core.prefs" under the working space ”

To cancel the automatic deployment of MyEclipse:
Right click on the item->properties, Builders, and remove the Deploymentbuilder check box.

Error: Closing myeclipse error when Web project is not successfully deployed in MyEclipse