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Java 24 to Reduce Object Header Size and Save Memory
JEP 450 (Compact Object Headers) has been targeted for delivery in JDK 24. This currently experimental feature optimizes heap utilization by shrinking the size of the mandatory object header in HotSpot. This should reduce overall heap size, improve density of deployments, and increase data locality.
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OpenJDK News Roundup: Compact Object Headers, Synch Virtual Threads, Disable Security Manager
There was a flurry of activity in the OpenJDK ecosystem during the week of October 28th, 2024, highlighting: four JEPs, having successfully completed their respective reviews, are now Targeted for JDK 24; and five new JEPs have been Proposed to Target for JDK 24 and will be under review during the week of November 4th, 2024.
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JDK 23 and JDK 24: What We Know So Far
JDK 23, the second non-LTS release since JDK 21, has reached its second release candidate phase with a final set of 12 new features, in the form of JEPs, that can be separated into four categories: Core Java Library, Java Language Specification, HotSpot and Java Tools. We examine JDK 23 and predict what features have, or could be, targeted for JDK 24.
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OpenJDK Project Valhalla Releases LW2 Prototype
Project Valhalla (OpenJDK) has released LW2, a new user-accessible prototype of the effort to align with modern hardware. InfoQ discusses this new prototype in-depth with IBM's tech lead for this new technology.
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Oracle Releases GraalVM 1.0, a Polyglot Virtual Machine and Platform
Oracle has announced the 1.0 release of GraalVM, a polyglot virtual machine and platform. The initial release includes the capability to run Java and JVM languages (via bytecode) as well as full support for JavaScript and Node.JS, with beta support for Ruby, Python and R code.
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Ahead-of-Time (AOT) Compilation May Come to OpenJDK HotSpot in Java 9
OpenJDK HotSpot may get Ahead-of-Time (AOT) compilation as early as Java 9. InfoQ covers the proposal submitted in September 2016.
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jClarity Releases Censum 3.0
Censum, the Java garbage collection analysis tool by jClarity, has reached version 3.0. The main new features of the new version include the ability to analyse Safepoint logs, new graphs showcasing the behaviour of the G1 garbage collector, and a set of analytics to highlight whenever applications force to much OS activity.
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Azul Systems release Zing Platform Edition for WebSphere Application Server
Azul Systems, Inc. announced the launch of Zing Platform Edition with WebSphere. Zing PE integrates IBM WebSphere Applications Server (WAS) with an enhanced version of its Zing Java Virtual Machine.
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Java7 Hotspot Loop Bug Details
Last week, Oracle released Java7 to great acclaim. However, an issue identified by the Apache Lucene project pointed to a specific hotspot optimisation bug which kicks in when a loop is executed more than 10,000 times. How serious is this issue, and does it warrant the kind of negative press that has been played out over the last few days?
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Mark Reinhold Talks About JRockit/Hotspot Integration
Oracle principal engineer and former Sun employee Mark Reinhold talks about Oracle's plans to merge the Hotspot and JRockit JVMs.
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JRuby's New IR Paves the Way for Future Performance Improvements
A new intermediate representation (IR) for JRuby code enables many optimizations and could bring the next performance boost. InfoQ talked to Subbu Sastry who works on the IR.