Is Java heavyweight? will the container images be huge? Nope, Java is pretty good at producing decent size container images. The table below shows the container image sizes for a variety of popular open source project. Java does pretty well on these measures.

This release improves error and warning reporting for variant issues during dependency resolution. It also exposes structural details of Java compilation errors for IDE integrators, making it easier to analyze and resolve issues.

A virtual thread is not mapped 1:1 to a dedicated OS-level thread. Rather, we can think of it as a task that is scheduled to a fork-join thread pool. When a virtual thread enters a blocking call, like waiting for a Future, it relinquishes the OS thread it occupies and simply remains in memory until it is ready to resume. In the meantime, the OS thread can be reassigned to execute other VTs in the same fork-join pool

Support nullness markers on Java types to indicate that a type rejects or deliberately allows nulls. This is a preview language feature.

Leyden is not a replacement for GraalVM native images but rather a substantial evolution of the JVM, and we expect it to bring some benefits to native images as well.

we need to understand how unused topics can cause pressure on Kafka. Like many other storage systems, all Kafka topics have a retention period, meaning that for any unused topics, the data will be purged after a period of time and the topic will become empty. A common question here is, “How could empty topics affect Kafka?”