As in the question, the error “Failed to clean project: Failed to delete” is reported when running the maven project. The reason is that the previously compiled project is still running and cannot be cleaned, which makes the maven life cycle unable to continue.

The solution is as follows:

Close the current eclipse console, as shown below:

After closing the console, the last running console will appear, just stop running:

Re-run the maven project and the problem is solved.