Cannot change version of project facet Dynamic Web Module to 2.3.

Catalog

Problem source description

use eclipse build maven project, The default is 2.3 Of ：
Open the project folder in the workspace .setting in org.eclipse.wst.common.project.facet.core.xml file ：

stay eclipse Right click on the item ,properties->Project Factets:

Change it to 3.0 Of , So I will org.eclipse.wst.common.project.facet.core.xml in 2.3 Changed to 3.0, as follows ：

After the change, there was a problem ：

Problem solving

It turned out , take web.xml We need to change .

Before the reform ：

After the reform ：

here maven->update project The mistake is gone .

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