Errors running builder 'Validation' on project 'gc-query'. java.lang.NullPointerException

The builder launch configuration could not be found.

 

 

1 An error occurred while filtering resources    gc-query       

在使用eclipse构建maven项目时，突然出现错误提示：An error occurred while filtering resources，在项目中到处都找不到哪里有问题，最后在国外网站找到解决办法：

maven报错：

maven An error occurred while filtering resources

Maven -> Update Project... resolved this problem for me

 

2 Cannot change version of project facet Dynamic Web Module to 2.5.

在工程目录下有一个.settings文件夹,打开org.eclipse.wst.common.project.facet.core.xml做如下修改:
<installed facet="jst.web" version="2.5"/>

3 Description    Resource    Path    Location    Type
One or more constraints have not been satisfied.