Book Image

Apache Tomcat 7 Essentials

By : Tanuj Khare
Book Image

Apache Tomcat 7 Essentials

By: Tanuj Khare

Overview of this book

Apache Tomcat (or simply Tomcat) is an open source servlet container developed by the Apache Software Foundation (ASF). The latest major stable release, Apache Tomcat version 7 implements the Servlet 3 and JavaServer Pages 2 specifications from the Java Community Process, and includes many additional features that make it a useful platform for developing and deploying web applications and web services.Apache Tomcat 7 Essentials follows a practical approach to teach installing, configuring, and maintaining Tomcat. It helps you to understand the middle architecture for hosting multiple websites and also provides the confidence to implement middleware support. It imparts to you the capacity to resolve migration issues and also provides regular maintenance solutions. This is the first and only book to cover upgrading to Tomcat 7 from previous versions.The journey of the reader starts at the beginner level and ends at the expert level. The content is designed in such a way that it balances the theory and practical approach for understanding concepts related to handling middle ware and web issues.In this book, you will go through a three-phase life cycle. The first cycle consists of installation, configuration of Tomcat 7 on different OS, and other configurations related to JDBC, port, deployment etc. The second phase deals with the building of enterprise application setup and high availability architecture (clustering load balancing). The third and critical phase will teach you to handle critical issues, performance tuning, and best practices for various environment stacks like dev/QA/stage/production.This book gives you a wider vision of using Tomcat 7 in web technologies and the skill to optimize their performance using Apache Tomcat 7.
Table of Contents (18 chapters)
Apache Tomcat 7 Essentials
About the Author
About the Reviewers

Common issues in deployment, configuration, and their troubleshooting

There are multiple issues which may arise after the deployment and configuration on Tomcat. Let's discuss the different issues:

Scenario 1:

Issue: Users complain that after the deployment, they can still view the old code.

Troubleshooting steps:

  • Check if the latest file is present on the doc base.

  • Check the catalina.out in the logs directory of Tomcat 7 and whether the WAR filename is deployed or not.

  • If both are checked and the issue still persists, then stop the Tomcat service and clear the content of the temp directory under the work/Catalina/localhost using the following command:

cd /opt/apache-tomcat-7.0.12/temp/ rm -rf ../temp/*
cd /opt/apache-tomcat-7.0.12/work/Catalina/localhost/ rm -rf ../localhost/*
  • Restart the Tomcat service and ask the user to test the application.

Scenario 2:

Issue: Users complaining that they can view the current deployed code on one node and the other node still displays the previous version...