Configuring Tomcat in eclipse and start the right project -> Run As -> Run on Server may appear unable to select Tomcat v7.0 phenomenon as shown below, do not panic rookie small series with you to solve!
1. Locate the metadata.plugins \ org.eclipse.core.runtime.settings your eclipse workspace
(for example, I put the disk in javaCode E, it is E: \ project.metadata.plugins \ org.eclipse.core. runtime.settings)
2. delete the following two files
(1) org.eclipse.wst.server.core.prefs
(2) org.eclipse.jst.server.tomcat.core.prefs
3. restart eclipse just fine, the problem solve.
