Upcoming Java 21 brings a bunch of new features, including very interesting progress in concurrency. There are two main improvements – virtual threads and structured concurrency.

In this article, we discuss incoming usage of these enhancements inJakarta EE (formerly Java EE, now an open source project maintained by the Eclipse Foundation), a set of specifications that enables the worldwide community of Java developers to work on cloud native Java enterprise applications. Jakarta Concurrency is the concrete specification describing the expected behaviour.

The support in Jakarta EE is currently under development, details may change in the final implementation.

During deployment of Jakarta EE applications to the Payara Server, all the xml files (e.g. web.xml, persinstence.xml) are verified against its schema.

Payara Platform includes all standard Jakarta EE schema, so there is typically no reason to download external schema to check against xml files. However, if the application uses external schema, in very rare cases, there may be an error during deployment. In this blog, I describe a quick fix to avoid this.