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Oracle GlassFish Server 3.1 Application Development Guide
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Document Information


Part I Development Tasks and Tools

1.  Setting Up a Development Environment

2.  Class Loaders

The Class Loader Hierarchy


Using the Java Optional Package Mechanism

Using the Endorsed Standards Override Mechanism

Class Loader Universes

Application-Specific Class Loading

Circumventing Class Loader Isolation

Using the Common Class Loader

Sharing Libraries Across a Cluster

Packaging the Client JAR for One Application in Another Application

To Package the Client JAR for One Application in Another Application

3.  Debugging Applications

Part II Developing Applications and Application Components

4.  Securing Applications

5.  Developing Web Services

6.  Using the Java Persistence API

7.  Developing Web Applications

8.  Using Enterprise JavaBeans Technology

9.  Using Container-Managed Persistence

10.  Developing Java Clients

11.  Developing Connectors

12.  Developing Lifecycle Listeners

13.  Developing OSGi-enabled Java EE Applications

Part III Using Services and APIs

14.  Using the JDBC API for Database Access

15.  Using the Transaction Service

16.  Using the Java Naming and Directory Interface

17.  Using the Java Message Service

18.  Using the JavaMail API


Chapter 2

Class Loaders

Understanding Oracle GlassFish Server class loaders can help you determine where to place supporting JAR and resource files for your modules and applications. For general information about J2SE class loaders, see Understanding Network Class Loaders.

In a JVM implementation, the class loaders dynamically load a specific Java class file needed for resolving a dependency. For example, when an instance of java.util.Enumeration needs to be created, one of the class loaders loads the relevant class into the environment.

The following topics are addressed here:

Note - The Web Profile of the GlassFish Server supports the EJB 3.1 Lite specification, which allows enterprise beans within web applications, among other features. The full GlassFish Server supports the entire EJB 3.1 specification. For details, see JSR 318.

For information about class loader debugging, see Class Loader Debugging.