Maven project won't compile after upgrade to Intellij 13.1 from 12

Question

My code no longer compiles after the upgrade. Imports from libraries that are included as maven dependencies show compile issue with Cannot resolve symbol. I have Invalida

Answer 1

In my case Cannot reconnect error was caused by absence of class DependencyTreeResolutionListener as idea.log states. I've noticed that library containing this class is absent in maven3 plugin but present in maven2. So I copied maven-dependency-tree-1.2.jar from /plugins/maven/lib/maven2 to /plugins/maven/lib/maven3. Then I updated current maven project by pushing Reimport All Maven Projects button in Maven Projects tool window. After that error was gone.