 <p>The problem is caused because the address you use to start tomcat (in normal or debug mode) is already taken by another process.</p> <p>You need to check the ports you are using in the you conf file (e.g. your_TOMCAT_HOME_DIR_/conf/server.xml), to see if they are not already used </p> <p>Here you can look at the port used for</p> <ul> <li>starting Tomcat: default value 8080 </li> <li>stopping Tomcat: default value 8005</li> <li>using with AJP protocoll: default value 8009</li> </ul> <p>and if you are using Tomcat in debug mode (through jdpa or jdwp ), please make sure to use a different port than all the previous configured ports</p>