This week's Java roundup for May 13th, 2024, features news highlighting: JEP 477, Implicitly Declared Classes and Instance Main Methods (Third Preview), proposed to target for JDK 23; the May 2024 edition of Piranha Cloud; Spring Data 2024.0.0; and point and milestone releases of Spring Framework, GlassFish and Micrometer.
OpenJDK
JEP 477, Implicitly Declared Classes and Instance Main Methods (Third Preview), has been promoted from Candidate to Proposed to Target for JDK 23. Formerly known as Unnamed Classes and Instance Main Methods (Preview), Flexible Main Methods and Anonymous Main Classes (Preview) and Implicit Classes and Enhanced Main Methods (Preview), this JEP incorporates enhancements in response to feedback from the two previous rounds of preview, namely JEP 463, Implicit Classes and Instance Main Methods (Second Preview), delivered in JDK 22, and JEP 445, Unnamed Classes and Instance Main Methods (Preview), delivered in JDK 21. This JEP proposes to "evolve the Java language so that students can write their first programs without needing to understand language features designed for large programs." This JEP moves forward the September 2022 blog post, Paving the on-ramp, by Brian Goetz, Java Language Architect at Oracle. The latest draft of the specification document by Gavin Bierman, consulting member of technical staff at Oracle, is open for review by the Java community. More details on JEP 445 may be found in this InfoQ news story. The review is expected to conclude on May 21, 2024.
JEP 482, Flexible Constructor Bodies (Second Preview), has been promoted from its JEP Draft 8325803 to Candidate status. This JEP proposes a second round of preview and a name change to obtain feedback from the previous round of preview, namely JEP 447, Statements before super(...) (Preview), delivered in JDK 22. This feature allows statements that do not reference an instance being created to appear before the this() or super() calls in a constructor; and preserve existing safety and initialization guarantees for constructors. Changes in this JEP include: a treatment of local classes; and a relaxation of the restriction that fields can not be accessed before an explicit constructor invocation to a requirement that fields can not be read before an explicit constructor invocation. Gavin Bierman, consulting member of technical staff at Oracle, has provided an initial specification of this JEP for the Java community to review and provide feedback.
JEP 481, Scoped Values (Third Preview), has been promoted from its JEP Draft 8331056 to Candidate status. Formerly known as Extent-Local Variables (Incubator), this JEP proposes a third preview, with one change, in order to gain additional experience and feedback from one round of incubation and two rounds of preview, namely: JEP 464, Scoped Values (Second Preview), delivered in JDK 22; JEP 446, Scoped Values (Preview), delivered in JDK 21; and JEP 429, Scoped Values (Incubator), delivered in JDK 20. This feature enables sharing of immutable data within and across threads. This is preferred to thread-local variables, especially when using large numbers of virtual threads. The change in this feature is related to the operation parameter of the callWhere() method, defined in the ScopedValue class, is now a functional interface which allows the Java compiler to infer whether a checked exception might be thrown. With this change, the getWhere() method is no longer needed and has been removed.
JDK 23
Build 23 of the JDK 23 early-access builds was made available this past week featuring updates from Build 22 that include fixes for various issues. Further details on this release may be found in the release notes.
GlassFish
The sixth milestone release of GlassFish 8.0.0 provides bug fixes, dependency upgrades and notable improvements such as: an improved Jakarta Contexts and Dependency Injection TCK; a new Jakarta JSON Processing standalone TCK runner; and an improved class loader matching for implementations of the Weld BeanDeploymentArchive interface. More details on this release may be found in the release notes.
GraalVM
Oracle Labs has released version 0.10.2 of Native Build Tools, a GraalVM project consisting of plugins for interoperability with GraalVM Native Image. This latest release provides notable changes such as: a new parameter that allows for skip building a native image for POM-type modules defaulting to false for backwards compatibility; and an improved ClassPathDirectoryAnalyzer class that includes a check for the boolean value of ignoreExistingResourcesConfig field. Further details on this release may be found in the changelog.
Spring Framework
The second milestone release of Spring Framework 6.2.0 ships with bug fixes, improvements in documentation, dependency upgrades and new features such as: a new pathVariableOrNull() method added to the ServerRequest interface as a nullable variant of pathVariable() method for Kotlin extensions; a new generateCodeForArgument() method in CodeFlow class to provide the same functionality as the one defined in the SpelNodeImpl class; and a new CompilableIndexAccessor interface to support compiling expressions that use a custom implementation of the IndexAccessor interface. More details on this release may be found in the release notes.
Similarly, versions 6.1.7, 6.0.20 and 5.3.35 of Spring Framework have also been released featuring bug fixes, improvements in documentation and notable improvements such as:
All three versions provide a dependency upgrade to Protect Reactor 2023.0.6, 2022.0.19 and 2020.0.44, respectively. Further details on these releases may be found in the release notes for version 6.1.7, version 6.0.20 and version 5.3.35.
Spring Data 2024.0.0 has been released providing new features: support for value expressions for improved in expressions in entity- and property-related annotations that aligns with Spring Framework @Value annotation; and compatibility with the new MongoDB 5.0 driver containing a deprecated API that has now been removed. There were also upgrades to sub-projects such as: Spring Data Commons 3.3.0; Spring Data MongoDB 4.3.0; Spring Data Elasticsearch 5.3.0; and Spring Data Neo4j 7.3.0. This new version will be included in the upcoming release of Spring Boot 3.3.0. More details on this release may be found in the release notes.
Similarly, versions 2023.1.6 and 2023.0.12 of Spring Data have been released providing bug fixes and respective dependency upgrades to sub-projects such as: Spring Data Commons 3.2.6 and 3.1.12; Spring Data MongoDB 4.2.6 and 4.1.12; Spring Data Elasticsearch 5.2.6 and 5.1.12; and Spring Data Neo4j 7.2.6 and 7.1.12. These versions may also be consumed by the upcoming releases of Spring Boot 3.2.6 and 3.1.12, respectively.
The release of Spring Web Services 4.0.11 ships with a dependency upgrade to Spring Framework 6.0.20 and notable changes: elimination of starting/stopping of an instance of the Apache ActiveMQ EmbeddedActiveMQ Artemis server before/after every test method from the JmsIntegrationTest class to improve test performance; and override the securement password using the MessageContext interface from the Wss4jHandler class to efficiently support per-request credentials. Further details on this release may be found in the release notes.
Quarkus
The release of Quarkus 3.10.1 delivers dependency upgrades and notable changes such as: elimination of a possible NullPointerException when the getResources() method defined in the QuarkusClassLoader class returns null; and a resolution to an issue mocking an implementation of the GitInfo interface with @MockitoConfig, an annotation that makes use of the AnnotationsTransformer API which does not work for synthetic beans, that is beans whose metadata are programmatically created in a Quarkus extension. More details on this release may be found in the changelog.
Apache Software Foundation
The release of Apache Tomcat 10.1.24 provides bug fixes and notable changes such as: a refactor of handling trailer fields to use an instance of the MimeHeaders class to store trailer fields; correct error handling from the onError() method defined in the AsyncListener interface for asynchronous dispatch requests; and a resolution to WebDAV locks for non existing resources for thread safety and removal. Further details on this release may be found in the release notes.
Hibernate
The first alpha release of Hibernate Search 7.2.0 delivers dependency upgrades and improvements to the Search DSL such as: the ability to apply queryString and simpleQueryString predicates for numeric and date fields; define the minimum number of terms that should match using the match predicate; and a new @DistanceProjection annotation to map a constructor parameter to a distance projection. More details on this release may be found in the release notes.
Micrometer
The release of Micrometer Metrics 1.13.0 delivers bug fixes, improvements in documentation, dependency upgrades and many new features such as: support for the @Counted annotation on classes and an update to the CountedAspect class to handle when @Counted is used on a class; removal of an unnecessary call to getConventionName() defined in the PrometheusMeterRegistry class; and allow for customizing a start log message in an implementation of the PushMeterRegistry abstract class. Further details on this release may be found in the release notes.
Similarly, versions 1.12.6 and 1.11.12 of Micrometer Metrics provide dependency upgrades and resolutions to bug fixes such as: a NullPointerException in the DefaultJmsProcessObservationConvention class; and the AnnotationHandler can't see methods from the parent class. More details on these releases may be found in the release notes for version 1.12.6 and version 1.11.12.
The release of Micrometer Tracing 1.3.0 ships with bug fixes, dependency upgrades and new features such as: a new TestSpanReporter class for improved integration tests that include components declared as beans that generate traces; and an implementation of the setParent() and setNoParent() methods, declared in the Tracer interface, in the SimpleSpanBuilder class. Further details on this release may be found in the release notes.
Similarly, versions 1.2.6 and 1.1.13 of Micrometer Tracing provide dependency upgrades to Micrometer Metrics 1.12.6 and 1.11.12, respectively and a resolution to an instance of the ObservationAwareBaggageThreadLocalAccessor class losing scope in the wrong order due to the JUnit @ParameterizedTest annotation executing tests in parallel which interferes with the baggage scopes resulting in return results in wrong spans and traces. More details on these releases may be found in the release notes for version 1.2.6 and version 1.1.13
Project Reactor
The second milestone release of Project Reactor 2024.0.0 provides dependency upgrades to reactor-core 3.7.0-M2, reactor-pool 1.1.0-M2 and reactor-netty 1.2.0-M2. There was also a realignment to version 2024.0.0-M2 with the reactor-kafka 1.4.0-M1, reactor-addons 3.6.0-M1 and reactor-kotlin-extensions 1.3.0-M1 artifacts that remain unchanged. Further details on this release may be found in the changelog.
Next, Project Reactor 2023.0.6, the sixth maintenance release, provides dependency upgrades to reactor-core 3.6.6. There was also a realignment to version 2023.0.6 with the reactor-netty 1.1.19, reactor-kafka 1.3.23, reactor-pool 1.0.5, reactor-addons 3.5.1 and reactor-kotlin-extensions 1.2.2 artifacts that remain unchanged. More details on this release may be found in the changelog.
Next, Project Reactor 2022.0.19, the nineteenth maintenance release, provides dependency upgrades to reactor-core 3.5.17 and reactor-netty 1.1.19. There was also a realignment to version 2022.0.19 with the reactor-kafka 1.3.23, reactor-pool 1.0.5, reactor-addons 3.5.1 and reactor-kotlin-extensions 1.2.2 artifacts that remain unchanged. Further details on this release may be found in the changelog.
And finally, the release of Project Reactor 2020.0.44, codenamed Europium-SR44, provides dependency upgrades to reactor-core 3.4.38 and reactor-netty 1.0.45. There was also a realignment to version 2020.0.44 with the reactor-kafka 1.3.23, reactor-pool 0.2.12, reactor-addons 3.4.10, reactor-kotlin-extensions 1.1.10 and reactor-rabbitmq 1.5.6 artifacts that remain unchanged. More details on this release may be found in the changelog.
Piranha Cloud
The release of Piranha 24.5.0 delivers notable changes such as: a new Tomcat10xExtension class to provide compatibility with Tomcat 10.0+; a new Glassfish7xExtension class to provide compatibility with GlassFish 7.0+; and removal of the SourceSpy project map. Further details on this release may be found in their documentation and issue tracker.
JobRunr
Version 7.1.2 of JobRunr, a library for background processing in Java that is distributed and backed by persistent storage, has been released providing a resolution to a BeanCreationException from within the validateTables() method defined in the DatabaseCreator class due to the table-prefix property not properly set. More details on this release may be found in the release notes.
Java Operator SDK
The release of Java Operator SDK 4.9.0 features dependency upgrades and removal of an invalid log message from the ReconciliationDispatcher class. Further details on this release may be found in the release notes.