I was trying to start a tomcat server 7 but i got an exception(error) like org.apache.catalina.LifecycleException
Later Problem Occurred like :
Server Tomcat v7.0 Server at localhost was unable to start within 45 seconds. If the server requires more time, try increasing the timeout in the server editor.
Right-click on the Tomcat server (under the Eclipse Servers perspective)
Select Open - it should open up the xml editor
Look for the Timeouts section and increase the value to > 45s