Book Image

Apache Geronimo 2.1: Quick Reference

Book Image

Apache Geronimo 2.1: Quick Reference

Overview of this book

Apache Geronimo is a robust, scalable, secure, and high-performing application server. But like all application servers, this power comes with a steep learning curve. This book can help you save your time and get working with Geronimo in matter of a few hours. This book is a quick-reference guide to Apache Geronimo that mitigates the starting pains that most developers have when they migrate to a new Application Server. It will help you to extend and amplify your existing development skills, empowering you to build new types of applications regardless of the platform or browser. The book will introduce you to the exciting features of Apache Geronimo Application Server. You will see how easily you can develop and deploy Java EE 5 applications on Geronimo. It covers everything from downloading the server to customizing it using custom GBeans. By following the practical examples in this book, you will be able to develop applications quickly using Geronimo Eclipse Plugin. The book covers Geronimo internals in detail, which helps you write custom services on Geronimo. Also, it helps you to gain a deep understanding of Geronimo plugin architecture and teaches you to extend your server functionality via plugins. By the end of the book, you will develop proficiency in Geronimo and Java EE 5 application development.
Table of Contents (21 chapters)
Apache Geronimo 2.1
Credits
About the Authors
About the Reviewer
Preface

Runtime errors


In this section, we will look at some runtime errors that can occur and how these errors can be resolved.

LoginException—No LoginModules configured

A LoginException occurs when the security realm configured in a web application is not running on the server. A warning message similar to the following will be logged to the geronimo.log file.

2009-07-17 00:48:58,234 WARN [TomcatGeronimoRealm] Login exception authenticating username "system"
javax.security.auth.login.LoginException: No LoginModules configured for test-realm
...

To resolve this error, make sure that the configured security realm is running. You can use the Security Realms portlet to view all of the security realms running on the server. To avoid running the application while the security realm is stopped, you should add a dependency on the security realm configuration to your application's deployment plan, so that the security realm is started automatically before starting your application.