This week's Java roundup for January 5th, 2026, features news highlighting: point releases of Gatherers4j and Keycloak; and maintenance releases of Spring gRPC, Quarkus, Grails and Java Operator SDK.

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JDK 26 Build 30 and JDK 27 Build 4 early-access builds are now available with various bug fixes. Spring gRPC 1.0.1 adds improved error messages and Kotlin coroutine support. Quarkus 3.30.6 fixes a JDK Flight Recorder NullPointerException and switches to a maintained LZ4 Java fork. Gatherers4j 0.13.0 introduces new stream methods for calculating medians, maximums, and minimums. Keycloak 26.5.0 previews JWT Authorization Grant and enhances OpenTelemetry support. Grails 7.0.5 fixes the url-mappings-report command and removes an unmaintained Tomcat module. Java Operator SDK 5.2.2 improves integration testing and fixes thread pool startup errors.

Java News Roundup: Spring gRPC, Quarkus, Gatherers4j, Keycloak, Grails, Java Operator SDK