Troubsle shooting - Eclipse Tomcat Deploy Stops Working

The Problem
Sometimes, Eclipse Tomcat plugin fails to work: your web app is not deployed.

Check List
Try Server -> Clean
If not work, try Project -> Clean
Check Eclipse Problems View, make sure there is no build path issue that stops Eclipse from compiling.

Check Tomcat Depoyment folder:
- Check whether tomcat plugin copied your web apps to this folder:
INFO: Command line argument: -Dcatalina.base=/Users/USERNAME/ws/YOUR_WS/.metadata/.plugins/org.eclipse.wst.server.core/tmp1
Feb 12, 2016 11:50:29 AM org.apache.catalina.startup.VersionLoggerListener log
INFO: Command line argument: -Dcatalina.home=/Users/USERNAME/src/apache/tomcat/apache-tomcat-8.0.21
Feb 12, 2016 11:50:29 AM org.apache.catalina.startup.VersionLoggerListener log
INFO: Command line argument: -Dwtp.deploy=/Users/USERNAME/ws/snei-qos/.metadata/.plugins/org.eclipse.wst.server.core/tmp1/wtpwebapps

Make sure classes are in WEB-INF/classes folder. 
--
Feb 12, 2016 11:50:43 AM org.apache.catalina.core.ApplicationContext log
INFO: No Spring WebApplicationInitializer types detected on classpath

Root cause - Eclipse "Build Automatically" was unchecked somehow at some time, so tomcat does copy the web apps folder in target to tomcat deployment folder, but no classes in  WEB-INF/classes there.

Misc:
Use Grep Console to Colorize logs in eclipse console
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