Every time MyEclipse workspace reports an error as follows:’Building workspace’ has encountered a problem. Errors occurred during the build. And the detailed information is: Errors occurred during the build.
Errors running builder’DeploymentBuilder’ on project’bos’.
java.lang. NullPointerException means that a null pointer appeared when deploying the XXX project.

      The picture is as follows:

I used to rebuild the workspace, but in this way all the settings have to be re-imported. The existing method is unsatisfactory: go to the folder where the workspace is located: E:\Workspaces\MyEclipse 10\.metadata\.plugins\org Delete the file com.genuitec.eclipse.ast.deploy.core.prefs under .eclipse.core.runtime\.settings\

Note:

1. The green part of the above path may be different from the personal workspace directory and Myeclipes version, please find your own workspace directory.

2. You must exit the myEclipse tool before deleting it