Eclipse appears in package already exists. Note:views might filter empty parent packages. Error

The main reason for this error is that you have already built the package before, but eclipse hides the empty package or the same type of package, Com.graduation.service and Com.graduation.service.impl are the same type.

If all are empty packages, Com.graduation.service will not be displayed in eclipse.

Solve the first kind of empty package
, is to

"Package Presentation" selected as "hierarchical"
。

The second kind of question,
Go directly to the project workspace and add the required classes to the Com.graduation.service folder.

Note: This is based on the eclipse version, and some versions do not have the above problem