Jakarta EE Monthly Platform Architecture Call

Date: 2023-03-07

Present:

• Jan Westerkamp (iJUG)
• Jared Anderson (IBM)
• Emily Jiang (IBM)
• Nathan Rauh (IBM)
• Tom Watson (IBM)
• Petr Aubrecht (Payara)
• David Matějček (OmniFish)
• Lukas Jungmann (Oracle)
• Dmitry Kornilov (Oracle)
• Tanja Obradovic (Eclipse Foundation)
• Werner Keil (Committer/Ambassador)
• Lenny Primak (Individual)

Agenda and Minutes

Follow up discussion

• Virtual Threads in Jakarta EE 11 (https://openjdk.org/jeps/436 )
  • Issue opened on Jakarta Concurrency
    • Asynchronous annotation
    • How much impact on other specs?
  • What about servlet or other async features of Jakarta REST?
    • AsynchronousServlet in Servlet
    • Suspend/Resume request and ClientBuilder.executorService in Jakarta REST (async scenario in Jakarta REST blog)
    • Asynchronous in EJB
    • XML Web Services (SOAP)
  • Decision to be made regarding which spec needs to support virtual thread.
  • Could this be implemented by app runtime?
  • Virtual thread needs to be in the spec?
    • Compute intensive tasks need to be platform thread?
      • Discussed but not agreed with an answer
    • Would default be platform thread or virtual thread?
    • Should an end user care about whether a virtual thread or platform thread is used?

  • Thread pool to control load and resources

      ExecutorService executor = Executors.newVirtualThreadPerTaskExecutor(); // New method
      ExecutorService executor = Executors.newFixedThreadPool(Integer poolSize); // Old method
    

• Other Java SE 21 features to leverage in Jakarta EE 11
  • JPMS support
  • Record support in JPA
    • No use case for entity
    • Entity: how to track lifecycle
  • Record support for Jakarta Data
    • Good for DTOs,
  • Record support for JSON-B and JSON-P
  • Record support for RESTful Web Services
  • Record support for CDI beans: should work

CN4J call preparation slides

• https://github.com/eclipse-ee4j/jakartaee-platform/issues/607