tomcat 启动报错 startup failed due to previous errors

3349 [localhost-startStop-1] INFO org.hibernate.cfg.SettingsFactory - Named query checking : enabled
3349 [localhost-startStop-1] INFO org.hibernate.cfg.SettingsFactory - Check Nullability in Core (should be disabled when Bean Validation is on): enabled
4049 [localhost-startStop-1] INFO org.quartz.core.QuartzScheduler - Scheduler scheduler_$_NON_CLUSTERED shutting down.
4049 [localhost-startStop-1] INFO org.quartz.core.QuartzScheduler - Scheduler scheduler_$_NON_CLUSTERED paused.
4053 [localhost-startStop-1] INFO org.quartz.core.QuartzScheduler - Scheduler scheduler_$_NON_CLUSTERED shutdown complete.
Mar 02, 2016 4:01:45 PM org.apache.catalina.core.StandardContext startInternal
SEVERE: One or more listeners failed to start. Full details will be found in the appropriate container log file
Mar 02, 2016 4:01:45 PM org.apache.catalina.core.StandardContext startInternal
SEVERE: Context [/heximobile] startup failed due to previous errors
Mar 02, 2016 4:01:45 PM org.apache.catalina.loader.WebappClassLoaderBase clearReferencesJdbc
SEVERE: The web application [/heximobile] registered the JDBC driver [com.mysql.jdbc.Driver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.
Mar 02, 2016 4:01:45 PM org.apache.catalina.loader.WebappClassLoaderBase clearReferencesThreads
SEVERE: The web application [/heximobile] appears to have started a thread named [MySQL Statement Cancellation Timer] but has failed to stop it. This is very likely to create a memory leak.
Mar 02, 2016 4:01:45 PM org.apache.catalina.loader.WebappClassLoaderBase clearReferencesThreads
SEVERE: The web application [/heximobile] appears to have started a thread named [Timer-1] but has failed to stop it. This is very likely to create a memory leak.
Mar 02, 2016 4:01:45 PM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deployment of web application directory /usr/apache-tomcat-7.0.67/webapps/heximobile has finished in 50,024 ms
Mar 02, 2016 4:01:45 PM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["http-nio-1303"]
Mar 02, 2016 4:01:45 PM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["ajp-bio-8009"]
Mar 02, 2016 4:01:45 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 50731 ms