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How to Monitor a Java Application with Prometheus and Grafana

TomonitoraJavaapplicationwithPrometheusandGrafana,firstinstrumenttheappusingMicrometerbyaddingmicrometer-registry-prometheusandSpringBootActuatordependencies,thenexposethe/actuator/prometheusendpointviaconfigurationinapplication.yml.2.SetupPrometheus

Jul 31, 2025 am 09:42 AM

java monitor

What's New in Java 21: A Comprehensive Guide

VirtualThreads (official version) significantly simplifies high-throughput concurrent programming, suitable for I/O-intensive tasks; 2. StructuredConcurrency (official version) improves the readability and security of concurrent code to avoid zombie threads; 3. StringTemplates (preview version) replaces String.format, making it safer to verify when compiling; 4. SequencedCollections API (official version) unified and ordered collection operations such as getFirst and reversed; 5. Other new additions include ScopedValues, RecordPatterns and GeneralZGC. It is recommended to be as soon as possible

Jul 31, 2025 am 09:32 AM

The Future of Java: Trends and Predictions

The future development trends of Java include: 1. The release model centered on the LTS version, and enterprises will mainly adopt long-term support versions such as Java17 and Java21; 2. ProjectLoom introduces virtual threads to greatly improve concurrency performance and simplify the programming model; 3. Enhance cloud-native and microservice support through GraalVM, Quarkus and other technologies to reduce resource consumption; 4. Continue to introduce modern language features such as record classes, pattern matching, sealing classes, etc. to improve expression and security; 5. Although JVM languages such as Kotlin and Scala have risen in specific fields, Java still maintains the dominant position of enterprise development with its ecological advantages; overall, Java is maintaining its enterprise-level and post-end through continuous evolution.

Jul 31, 2025 am 09:21 AM

Securing Java REST APIs with Spring Security and JWT

Implementing the JWT-based RESTAPI security mechanism in SpringBoot applications, first of all, you need to understand that the server issues the JWT after the user logs in, the client carries the token in the Authorization header of subsequent requests, and the server verifies the validity of the token through a custom filter; 2. Add spring-boot-starter-security, spring-boot-starter-web and jjwt-api, jjwt-impl, and jjwt-jackson dependencies in pom.xml; 3. Create a JwtUtil tool class to generate, parse and verify JWT, including extracting usernames, expiration time, generating tokens and proofing

Jul 31, 2025 am 09:13 AM

Building Scalable Java Applications on Google Cloud Platform

Choosetherightcomputeservice—useGKEformicroservices,CloudRunforstatelessapps,orAppEngineforsimplicity,andautomatedeploymentswithCloudBuild.2.LeveragemanagedserviceslikeCloudSQL,Firestore,Pub/Sub,andCloudStoragetoreduceoperationaloverheadandensureinde

Jul 31, 2025 am 09:11 AM

Solving Common Concurrency Issues in Java

Raceconditionsoccurwhenmultiplethreadsaccessshareddata,leadingtoinconsistencies;fixwithsynchronized,AtomicInteger,orReentrantLock.2.Deadlockariseswhenthreadswaitindefinitelyforeachother’slocks;preventbyconsistentlockordering,usingtryLockwithtimeout,a

Jul 31, 2025 am 09:09 AM

Troubleshooting Common Java `OutOfMemoryError` Scenarios

java.lang.OutOfMemoryError: Javaheapspace indicates insufficient heap memory, and needs to check the processing of large objects, memory leaks and heap settings, and locate and optimize the code through the heap dump analysis tool; 2. Metaspace errors are common in dynamic class generation or hot deployment due to excessive class metadata, and MaxMetaspaceSize should be restricted and class loading should be optimized; 3. Unabletocreatenewnativethread due to exhausting system thread resources, it is necessary to check the number of threads, use thread pools, and adjust the stack size; 4. GCoverheadlimitexceeded means that GC is frequent but has less recycling, and GC logs should be analyzed and optimized.

Jul 31, 2025 am 09:07 AM

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How to set up a professional Java Development Environment

Install the appropriate JDK (recommended Java17LTS version, use trusted distributions such as EclipseTemurin), set JAVA_HOME and PATH environment variables, and pass java-version and javac-version verification; 2. Select a professional IDE (recommended IntelliJIDEACommunity), configure the compiler, code style and necessary plug-ins such as Lombok and SonarLint; 3. Use the build tools Maven or Gradle to manage dependencies and project structures, it is recommended to use GradleWrapper or install Maven and configure MAVEN_HOME; 4. Install Git and configure user information

Jul 31, 2025 am 09:01 AM

Java for Data Science: Libraries and Use Cases

Javaisapracticalchoicefordatascienceinenterpriseandlarge-scaleenvironments.1.ApacheCommonsMathprovidesmathematicalandstatisticaltoolsforcustomalgorithms.2.WekaoffersacomprehensivesuiteofMLalgorithmsandGUItools,idealforprototyping.3.DL4Jenablesdeeplea

Jul 31, 2025 am 08:10 AM

Cloud-Native Java Applications with Quarkus

Quarkusisidealforcloud-nativeJavaapplicationsduetoitscontainer-firstdesign,enablingfaststartup,lowmemoryusage,andseamlessKubernetesandserverlessintegration.1.Itusesbuild-timeoptimizationtominimizeruntimeoverhead.2.NativeimagesupportviaGraalVMdelivers

Jul 31, 2025 am 08:06 AM

java Quarkus

Advanced Spring Data JPA for Java Developers

The core of mastering Advanced SpringDataJPA is to select the appropriate data access method based on the scenario and ensure performance and maintainability. 1. In custom query, @Query supports JPQL and native SQL, which is suitable for complex association and aggregation operations. It is recommended to use DTO or interface projection to perform type-safe mapping to avoid maintenance problems caused by using Object[]. 2. The paging operation needs to be implemented in combination with Pageable, but beware of N 1 query problems. You can preload the associated data through JOINFETCH or use projection to reduce entity loading, thereby improving performance. 3. For multi-condition dynamic queries, JpaSpecifica should be used

Jul 31, 2025 am 07:54 AM

java

Understanding Java Concurrency Locks and Latches

Lock is used to protect shared resources and ensure thread safety; Latch is used to coordinate thread execution order and wait for events to complete. 1. Lock, such as ReentrantLock, controls resource access through lock() and unlock(), supports attempts to add locks, timeouts, etc., which is suitable for scenarios where high concurrency requires fine control; 2. Latch, such as CountDownLatch, implements thread waiting through countDown() and await(), which is suitable for scenarios where multiple thread tasks are started and waits for them to complete before continuing to execute; 3. Use Lock to manually release the lock to avoid deadlocks, and use Latch to ensure that the counter is zeroed to prevent blockage. The two are designed to be different and are often used together

Jul 31, 2025 am 07:45 AM

Introduction to Machine Learning with Java

Javaisaviableandpracticalchoiceformachinelearning,especiallyinenterpriseenvironments.1)Javaoffersperformance,scalability,andseamlessintegrationwithexistingsystems,makingitidealforlarge-scaleandlow-latencyapplicationslikefrauddetection.2)Keylibrariess

Jul 31, 2025 am 07:43 AM

Modern Java Development with Visual Studio Code

VSCodeisapowerful,lightweightalternativeformodernJavadevelopment.1.SetupJavabyinstallingJDK11 ,VSCode,andtheJavaExtensionPackforfulltoolingsupport.2.Benefitfromintelligentcodeediting,real-timeerrorchecking,refactoring,andseamlessMaven/Gradleintegrati

Jul 31, 2025 am 07:23 AM