Adaptive Heap Sizing + Numeric Conversion + Primitive Patterns - Inside Java Newscast #117

JDK 28’s adaptive heap sizing for ZGC dynamically balances CPU use and memory consumption with close-to-zero configuration. Value classes introduce new challenges for conversions between custom numeric types, which type classes could eventually address, but unresolved questions about how these features should interact mean that primitive patterns won’t return in JDK 28 and will instead be withdrawn. 😟 Other highlights are upcoming Java events and JDK 28’s planned features.

Show Notes

Adaptive heap sizing for ZGC:

• JEP 546: Adaptive Heap Sizing for ZGC

Java events:

• FOSDEM

• JVMLS

• JavaOne tickets

Value classes, numeric conversions, primitive patterns:

• JLS on conversions

• Brian Goetz on type classes

• Amber mail on primitive patterns

• Amber mail on constant patterns

JDK 28:

• early-access builds

• feature list

Additional Resources

• dev.java: the destination for Java developers

• OpenJDK: the place to collaborate on the Java Platform and related projects

• Oracle Java: the #1 programming language and development platform

The "Inside Java Newscast" is a monthly YouTube show - check out the YouTube playlist for all the episodes. Since 2026, we also publish it as a podcast. For more Java news, subscribe to our RSS feed and follow @Java on X.

Contact us.