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This guide explains how to install SDKMAN!, use it to list, install, switch, and set global or project‑specific Java JDK versions, upgrade existing installations, and discover other SDKs, providing a practical solution for frequent Java version changes in microservice development.
Java 24, the latest non‑LTS release, brings 24 new features across security, performance, and language enhancements—including KDF APIs, ahead‑of‑time class loading, a new class‑file API, stream gatherers, scoped values, and quantum‑resistant signatures—while previewing Java 25 for September.
This article explains a long‑standing JDK bug where Arrays.asList().toArray() returns an Object[] that causes ArrayStoreException when modified, analyzes the underlying implementation differences between java.util.ArrayList and Arrays$ArrayList, and describes how the issue was finally fixed in JDK 9.
This article provides a detailed, beginner‑friendly tutorial on purchasing an Alibaba Cloud ECS instance, configuring the operating system, and installing JDK 8, Redis, and MySQL 8.0—including necessary firewall and security‑group settings—to launch a functional web‑site environment.
The Java Module System (Project Jigsaw) introduced in Java 9 defines uniquely named modules with descriptors that declare dependencies, exported and opened packages, and services, enabling clear dependency management, smaller custom runtimes, stronger encapsulation, improved performance, security, and easier maintenance, while supporting migration strategies and best‑practice guidelines.
This article demonstrates how to use the JDK's built-in command-line and graphical tools—such as jps, jinfo, jvisualvm, jstat, jstack, and jcmd—to monitor JVM performance, analyze GC behavior, inspect thread stacks, and troubleshoot memory and configuration issues in Java applications.
The article guides beginners through command‑line Java execution, showing how JDK 8 requires explicit compilation and class‑path, JDK 11 introduces single‑source file launching without compilation, and JDK 22 extends this to multi‑file programs, allowing direct execution of several source files with a simple java command.
Upgrading from JDK 8 to JDK 19 brings significant performance, security, and modularity improvements, but requires careful compatibility testing, performance evaluation, and security checks, while offering new features such as Text Blocks, Virtual Threads, Record Patterns, and enhanced APIs, positioning Java for future cloud, big data, and AI workloads.
This article reviews the most widely adopted Java language enhancements introduced from Java 8 through Java 20, including local‑variable type inference, switch expressions, text blocks, records, pattern‑matching instanceof, sealed classes, and improved NullPointerException messages, providing examples and reference links for each feature.
New Relic’s 2023 State of the Java Ecosystem report reveals a 430% surge in Java 17 adoption, declining use of older LTS releases, Amazon Corretto overtaking Oracle as the leading JDK provider, and a dominant shift toward containerized Java workloads, while the article also promotes a ChatGPT community and related services.
The article summarizes New Relic's 2023 Java ecosystem report, highlighting rapid adoption of Java 17, the decline of older LTS versions, the rise of Amazon Corretto as the leading JDK vendor, widespread containerization, and shifting preferences toward LTS releases and specific garbage collectors.
This article compares JDK 8, 17, and 21 using SPECjbb®2015 to evaluate throughput, latency, and memory consumption of G1, Parallel, and generational ZGC, highlighting significant performance gains and offering upgrade guidance for Java applications.
This article provides a comprehensive overview of the major language and runtime enhancements introduced in JDK 12 through JDK 17, covering switch expressions, micro‑benchmarking with JMH, class‑data sharing, garbage‑collector improvements, new String methods, hidden and sealed classes, records, and unified asynchronous logging, all illustrated with code examples.
This article explains why upgrading from JDK8 or JDK11 to the long‑term support JDK17 brings significant garbage‑collector performance improvements, new language features, and better framework compatibility, and provides detailed migration steps, Maven and SpringBoot configuration changes, and troubleshooting tips.
This guide explores the JDK command‑line utilities located in %JAVA_HOME%\bin, explaining how tools such as jps, jstat, jinfo, jmap, jhat and jstack can be used to monitor JVM processes, analyze performance bottlenecks, inspect memory usage, generate heap dumps, and adjust runtime parameters for more efficient and stable Java applications.
This guide explains how to troubleshoot and fix the UnsupportedOperationException caused by missing or outdated ASM libraries when upgrading the JDK, covering removal of old Maven dependencies, adding the correct ASM version, updating Groovy and related plugins, and disabling the Log4j shutdown hook warning.
The article recaps a Scala & Java meetup where experts discussed the challenges of traditional Java threading, introduced JDK virtual threads as a low‑overhead concurrency solution, examined their benefits and limitations, and explored the impact of virtual threads on Scala and reactive programming.
This article explains why upgrading to JDK 17 is essential, outlines the long‑term support, performance gains from modern garbage collectors like ZGC, new language features such as switch expressions and records, and provides detailed migration steps, Maven and Spring Boot configuration, and troubleshooting tips for a smooth transition.
The article recaps a Scala & Java meetup where experts discussed Java virtual threads as a breakthrough for JDK concurrency, examined their advantages over traditional threads, addressed limitations, explored their impact on Scala and other JVM languages, and included audience Q&A and community announcements.
The article explains why Java 21 deprecates the Windows 32‑bit x86 port and dynamic agent loading, describes the technical reasons, shows the new configuration options and related warnings, and discusses the impact on virtual threads and best practices for avoiding deprecated APIs.