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Securing a Java REST API with Spring Security

AddSpringSecurityandJWTdependenciesinpom.xmltoenablesecurityandtokenhandling.2.CreateaJwtRequestFiltertointerceptrequests,extractandvalidateJWTtokens,andsetauthenticationinthesecuritycontext.3.ConfigureSecurityConfigtodisableCSRF,permitpublicaccessto

Jul 28, 2025 am 02:13 AM

Advanced Java Interview Questions for Senior Developers

Advanced Java interview questions mainly examine the understanding of JVM internal mechanisms, concurrent programming, performance tuning, design patterns and system architecture. 1. The Java memory model (JMM) defines the visibility, atomicity and order of memory operations between threads. The volatile keyword and happens-before rules ensure correct synchronization to avoid the problem of update invisibility caused by CPU cache. G1GC is suitable for large heaps and predictable pause scenarios. Areas with a lot of garbage are preferred through area recycling. ZGC uses shading pointers and loading barriers to achieve submillisecond-level pauses, and the pause time is independent of the heap size, which is suitable for low-latency systems. 2. Use ConcurrentHashMap to design thread-safe LRU cache

Jul 28, 2025 am 02:12 AM

java programming

What's New in Java 17 and Beyond

Java17introducedkeyfeatureslikesealedclasses,patternmatchingforswitch(preview),removaloftheAppletAPI,anewmacOSrenderingpipeline,strongerencapsulationofJDKinternalsbydefault,andtheincubatorForeignFunction&MemoryAPI;beyondJava17,versions18to22added

Jul 28, 2025 am 02:03 AM

A Comparison of Java Web Frameworks: Spring Boot, Micronaut, and Quarkus

Quarkuswinsfornativecompilationandfasteststartup,2.Micronautexcelsinlow-memoryJVMscenarios,3.SpringBootleadsinecosystemsizeandeaseofadoption,4.QuarkusandMicronautoffersuperiordeveloperexperiencewithlivereload,5.Forcloud-nativeandserverless,Quarkusisb

Jul 28, 2025 am 01:51 AM

Introduction to the Eclipse Vert.x Toolkit for Reactive Java Applications

EclipseVert.xisalightweight,high-performancetoolkitforbuildingreactive,event-drivenJavaapplicationsontheJVM.1.Itusesaneventloopmodeltohandleconcurrencywithoutblocking,ensuringhighscalabilityandlowlatency.2.Thecoreunitofdeploymentisaverticle,whichruns

Jul 28, 2025 am 01:50 AM

Reactive programming Vert.x

The definitive guide to Java Platform Threads (Project Loom)

ProjectLoomintroduceslightweightvirtualthreadstoJava,simplifyinghigh-throughputconcurrentapplicationdevelopment.1.Virtualthreadsarelightweight,JVM-managedthreadsthatenablemassiveconcurrencywithouttheoverheadofOS-backedplatformthreads.2.Theyallowsynch

Jul 28, 2025 am 01:48 AM

Low-Latency Java Programming Techniques

Minimizegarbagecollectionbyusingobjectpooling,stackallocationviaescapeanalysis,primitivecollections,andlimitingobjectchurn,whileleveraginglow-pauseGCslikeZGCorShenandoah.2.Useringbuffersandlock-freedatastructuressuchastheDisruptorpatternforhigh-throu

Jul 28, 2025 am 01:37 AM

Functional Programming Concepts in Java

Java supports the concept of functional programming, which can be achieved by 1. Using functional interfaces and lambda expressions to implement first-class and higher-order functions; 2. Using immutable objects and pure functions to implement immutability and pure functions; 3. Using StreamAPI for declarative data processing; 4. Using Function andThen and compose methods to realize function combinations; 5. Avoid side effects and prioritize expressions over statements, so as to write clearer, predictable and easy to test code.

Jul 28, 2025 am 01:34 AM

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A Deep Dive into Java's `Optional` for Null-Safe Code

Optional should be used as the return type of a possible resultless method, and clearly expresses that the value may be missing; 2. Use map/flatMap to safe chain calls to avoid nested null checks; 3. Use orElseGet instead of orElse to prevent unnecessary computational overhead; 4. Use ifPresent to handle side effects when existing, which is concise and empty-failed; 5. Filter can terminate the operation in advance based on conditions; do not call get without checking first, and do not return null instead of Optional.empty(). It is not a collection tool, but a semantic mechanism that expresses whether a single value exists or not. Correct use can make the code more robust and the intentions are clearer.

Jul 28, 2025 am 01:25 AM

Mastering Java 21 Virtual Threads for High-Concurrency Applications

Java21's virtual threads significantly improve the performance of high-concurrent applications. 1. It manages lightweight threads through JVM, making it easy for a stand-alone to run hundreds of thousands of concurrent tasks; 2. It is suitable for I/O-intensive scenarios such as web services, microservices and batch processing; 3. Existing blocking code does not need to be rewrite, it only needs to be run in virtual threads; 4. It is recommended to use StructuredTaskScope to manage concurrent tasks to avoid resource leakage; 5. It is not suitable for CPU-intensive tasks, and platform threads or parallel streams should continue to be used; 6. Mainstream frameworks such as SpringBoot6, Tomcat, and Jetty are supported and can be enabled through configuration; 7. Note that blocking calls such as JDBC will occupy the carrier thread, affecting the overall concurrency;

Jul 28, 2025 am 01:20 AM

How the Java Classloader Works: A Detailed Explanation

TheJavaClassLoaderisacorecomponentoftheJVMthatdynamicallyloadsclassesatruntime,enablingfeatureslikemodularityandhotdeployment.2.ItoperatesthroughahierarchyofthreeprimaryClassLoaders:Bootstrap(loadscoreJavaclasses),Platform(handlesextensiondirectories

Jul 28, 2025 am 01:18 AM

A Comprehensive Guide to Java Logging Frameworks: SLF4J, Logback, and Log4j2

SLF4J is the log facade, Logback and Log4j2 are specific implementations, and combinations should be selected according to the scene. 1. Generally, SpringBoot applications recommend using SLF4J Logback because of its default integration and simple configuration; 2. High-throughput services should use SLF4J Log4j2 to obtain better performance and asynchronous log support; 3. If structured logs are required in microservices, you can combine Log4j2's JSON layout or Logback's logstash-logback-encoder; 4. Log4j1.x should be upgraded to Log4j2 when migrating the old system. It is necessary to avoid multiple SLF4J bindings, ensure the introduction of actual log implementations, and use {} placeholders.

Jul 28, 2025 am 01:08 AM

A Practical Guide to Java NIO and Asynchronous I/O

JavaNIO and AsynchronousI/O are suitable for high concurrency and high throughput application scenarios. 1. NIO realizes non-blocking I/O through Channels, Buffers and Selectors, supports single thread management of multiple connections, and is suitable for high concurrent network servers. 2. AsynchronousI/O (AIO) is based on callbacks or Future, truly implements asynchronous operations, suitable for low-latency and high-scalable services; 3. File I/O and memory mapping use NIO FileChannel, and high-concurrency network services are preferred for NIO Selector, while AIO can be considered asynchronous needs; 4. In actual development, mature boxes such as Netty are recommended.

Jul 28, 2025 am 01:04 AM

Java Interface vs. Abstract Class: Making the Right Choice

Useaninterfacewhenyouneedacontractforbehavior,especiallyforunrelatedclassesthatshouldsupportthesamecapability,suchasimplementingarolelikeFlyable.2.Useanabstractclasswhenyousharecodeorstateamongrelatedclasses,providingcommonfunctionalitywhilerequiring

Jul 28, 2025 am 12:53 AM

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