Correct method
windows->perferences
Delete all the options. These are the Tomcats you deleted after you added them. One doesn’t leave. Restarting eclipse after deleting solves the problem
Problem solving can be added.
Failure method
There is no such directory in my eclipse4.3 directory..metadata/.plugins/org.eclipse.core.runtime/.settings】
1. Close Eclipse
2. Open the location of WorkSpace.
{workspace-directory}/.metadata/.plugins/org.eclipse.core.runtime/.settings
Delete the following files
org.eclipse.jst.server.tomcat.core.prefs
org.eclipse.wst.server.core.prefs
3. Restart Eclipse to solve all problems.