MAVEN Web project cannot create folders such as Src/main/java.

　　Eclipse creates the maevn Web project, and after selecting the Maven_archetype_webapp prototype, the default is only src/main/resources this source floder.

　　According to the MAVEN directory structure, add src/main/java, Src/test/java and other source Floder, will report the folder is already a source folder error.

　　

　　

　　

Workaround: Use the Navigator view to create the Java directory directly under the Src/main directory.

Navigator, Showwiew, window

Analysis Reason: Project properties,Java Build Path->source, you will see Src/main/java, Src/test/java already exists, but missing. So just create the directory, and the Source Floder appears.

MAVEN Web project cannot create folders such as Src/main/java.