Sun GlassFish Enterprise Server 

Samples Main Page

The Java Persistence API Locking Sample Application

This sample demonstrates the use of locking with Java Persistence APIs.

Application Structure

The application is built and deployed as a WAR file.

Web Module

The web module consists of:

Test Client

The Test client consist of

Optimistic Locking offers better concurrency but can result in few transaction failures. Where as using Pessimistic Locking reduces concurrency with no transaction failures. Please keep this point in mind while making locking choices for your application.


Building, Deploying, and Running the Application

Perform the following steps to build, deploy, and run the application:

  1. Set up your build environment and configure the application server with which the build system has to work by following the common build instructions.
  2. app_dir is the sample application base directory: samples_install_dir/javaee6/jpa/locking.
  3. Change directory to app_dir.
  4. Build, deploy, and run the sample application using the all target.
  5. app_dir> ant all

    You can replace the ant all command with the following set of commands:

    app_dir> ant default compiles and packages the application

    app_dir> ant deploy deploys it to application server

    app_dir> ant run runs the test java client

  6. Use the target clean to undeploy the sample application and to remove the temporary directories such as build and dist.

    app_dir> ant clean

Building, Deploying, and Running the Application in NetBeans IDE

Perform the following steps to build, deploy, and run the application using NetBeans IDE:

  1. Refer to the common build instructions for setting up NetBeans IDE and Sun GlassFish Enterprise Server.
  2. In the NetBeans IDE, choose File → Open Project (Ctrl-Shift-O), navigate to the samples_install_dir/javaee6/jpa/ directory, select locking, and click Open Project.
  3. In the Projects tab, right click locking and select Run to build, deploy, and run the project.

Troubleshooting

If you have problems when running the application, refer the troubleshooting document.

 


Copyright © 2009 Sun Microsystems, Inc. All rights reserved.