When importing a web project in eclipse, you may not be able to convert the project type. After importing the project, it is a Java project. I have experienced many times. Today, some colleagues have encountered similar problems, write down the solution so that you do not need to search for it in the future.
Solution:
1. Enter the project directory, and you can see the. project file. Open.
2. Find <natures>... </natures>Code.
3. Add and save the following TAG content to the code snippet in Step 1:
<Nature> org. Eclipse. WST. Common. Project. facet. Core. Nature </nature>
<Nature> org. Eclipse. WST. Common. modulecore. modulecorenature </nature>
<Nature> org. Eclipse. Jem. workbench. javaemfnature </nature>
4. Right-click the Eclipse project and refresh the project.
5. Right-click the project and choose Properties)
6. Click "project facets" in the list project on the left, select "dynamic web module" and "Java" on the right, and click "OK" to save the configuration.