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thread-racing: A Jakarta EE thread racing web application

A thread racing web application that demonstrates technologies introduced or updated in the latest Jakarta EE specification.

What is it?

The thread-racing quickstart is a web application that demonstrates new and updated technologies introduced by the {javaVersion} specification through simple use cases.

The web application allows the user to trigger a race between 4 threads and follow, in real time, the progress of each thread until the race ends.

The race itself consists of multiple stages, each demonstrating the usage of a specific new or updated {javaVersion} technology:

  • Batch 1.0

  • EE Concurrency 1.0

  • JAX-RS 2.0

  • JMS 2.0

  • JSON 1.0

WebSockets 1.0 is one of the most relevant new technologies introduced by {javaVersion}. Instead of being used in a race stage, a WebSockets 1.0 ServerEndpoint provides the remote application interface. A new race is run when a client establishes a session. That session is then used to update the client in real time, with respect to the race progress and results. The src/main/java/org/jboss/as/quickstarts/threadracing/WebSocketRace.java file is the WebSocket server endpoint class and is a good entry point when studying how the application code works.

JPA 2.1 is also present in the application code. Specifically it is used to store race results in the default data source instance, which is also new to Jakarta EE. Further details are included in the src/main/java/org/jboss/as/quickstarts/threadracing/results/RaceResults.java class.

Access the application

The application will be running at the following URL http://localhost:8080/{artifactId}/.

To start a race press the Insert Coin button. The page displays the names of the threads as they join the race. It then tracks the progress of each thread through the Batch, EE Concurrency, JAX-RS, JMS, and JSON stages of the race. Finally, it displays the official race results and championship standings.

Server Log: Expected Warnings and Errors

Note
 You will see the following warning in the server log. You can ignore this warning. 
HHH000431: Unable to determine H2 database version, certain features may not work
Note
 Within {JBDSProductName}, make sure you define a server runtime environment that uses the standalone-full.xml configuration file.