Tomcat hosting » Jakarta Tomcat server (part 2)
Contents
  1. Tomcat tutorial
  2. What is Tomcat valve?
  3. Tomcat security realms
  4. Log4j project
  5. Log4j appenders
  6. Log4j configurators
  7. How to install Apache & Tomcat server
  8. Tomcat deployment
  9. Configure Tomcat
  10. How to use Tomcat manager
  11. Jakarta Tomcat server overview
  12. Jakarta Tomcat server (part 2)
  13. Persistend sessions
  14. Embedding Tomcat services
  15. Find out more about Tomcat architecture
  16. How to install tomcat on Windows & Linux

Jakarta Tomcat server (part 2)

Specialized Realm Implementations

Tomcat provides two methods for protecting resources. The first authentication implementation provided with Tomcat is a memory realm. The class that implements the memory realm is org.apache.catalina.realm.MemoryRealm.

The MemoryRealm class uses a simple XML file as a container of users. The second authentication implementation included with Tomcat is a JDBC realm.

A JDBCRealm class is much like the MemoryRealm, with the exception of where it stores its collection of users. A JDBCRealm stores all of its users in a userdefined, JDBC-compliant database.

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Tomcat Valves

Tomcat valves are a new technology introduced with Tomcat 4. They allow you to associate an instance of a Java class with a particular Catalina container.

Valves are proprietary to Tomcat and cannot, at this time, be used in a different servlet/JSP container.

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