exception « Tomcat « JPA Q&A

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1. Tomcat, Hibernate and the java.io.EOFException    stackoverflow.com

My Java application, which uses Hibernate and it's hosted by Tomcat 6.0, gets the following exception after a long time of inactivity when it tries to access the DB: 

com.mysql.jdbc.CommunicationsException: Communications link ...

2. Exception on starting Tomcat    stackoverflow.com

I have a web application that applies JPA, Hibernate, Spring and Wicket. When I run Tomcat, it is started, but there is an Exception: 

WARN   org.hibernate.ejb.packaging.InputStreamZippedJarVisitor - Unable to find ...

3. Exception using Hibernate and Tomcat: Cannot open connection    forum.hibernate.org

Quickstart A quickstart to servlets. DB Connection ...