Workaround without Project Facets

Solution steps:

1. Enter the project directory, you can see the .project file and open it.

2. Find the ... code snippet.

3. Add the following tag content to the code segment in step 2 and save it:

Copy after login

org.eclipse.wst.common.project.facet.core.nature
 org.eclipse.wst.common.modulecore.ModuleCoreNature
 org.eclipse.jem.workbench.JavaEMFNature
1.
2.
3.

4. Right-click on the eclipse project and refresh the project.

5. Right-click on the project and enter properties

6. Click to select "Project Facets" in the list item on the left, select "Dynamic Web Module" and "Java" on the right, and click OK to save.