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GraalVM for High-Performance Java Applications

GraalVM changes the performance bottleneck of Java through four key technologies: 1. Native mirroring technology compiles Java applications into local executable files in advance, achieving millisecond startup, lower memory footprint and smaller deployment packages, suitable for Serverless and microservices; 2. High-performance JIT compiler replaces HotSpot's C2, adopts more aggressive optimization algorithms, and improves performance by 20% to 50% in computing-intensive scenarios; 3. Multilingual integration uses Truffle framework to achieve efficient collaboration between Java and JavaScript, Python and other languages, reducing script embedding and hybrid development overhead; 4. Practical applications need to deal with challenges such as long construction time, explicit configuration of reflection, incompatibility of some libraries, and complex debugging.

Jul 28, 2025 am 03:23 AM

java Performance optimization

Using MapStruct for Painless Bean Mapping in Java

MapStruct is a compile-time code generator used to simplify mapping between JavaBeans. 1. It automatically generates implementation classes by defining interfaces to avoid manually writing lengthy set/get mapping code; 2. It has type-safe, no runtime overhead, supports automatic mapping of the same name fields, custom expressions, nested objects and collection mapping; 3. It can be integrated with Spring and uses @Mapper(componentModel="spring") to inject mapper into Springbean; 4. Simple configuration, just introduce mapstruct dependencies and annotationProcessorPaths inserts

Jul 28, 2025 am 03:20 AM

java

Building Interactive UIs with JavaFX

To start building an interactive UI using JavaFX, you must first correctly configure the environment and master the basic UI components, layout, event processing, FXML separation design, CSS style and animation effects. 1. When configuring JavaFX projects, if you use Maven, add javafx-controls dependencies; otherwise, manually configure the SDK and set the --module-path and --add-modules running parameters. 2. Create the main class to inherit Application, override the start() method, define Stage, Scene, control (such as Button, Label) and event response (such as setOnAction), and launch(

Jul 28, 2025 am 03:19 AM

Securing REST APIs in Java using Spring Security

DisableCSRFandsetsessioncreationpolicytoSTATELESSinSecurityConfigtoensurenosessioniscreated;2.UseJWTfortoken-basedauthenticationbygeneratingasignedtokenafterloginandreturningittotheclient;3.ValidatetheJWTinacustomfilter(JwtAuthFilter)thatextractsthet

Jul 28, 2025 am 03:08 AM

java

Mastering Generics in Java for Type-Safe Code

Using generics can improve the type safety and reusability of Java code. The answer is that generics must be used to avoid runtime errors and reduce type conversion; 1. Generics can check type safety at compile time, eliminate cast type conversion, and improve code clarity; 2. Generics can be defined to encapsulate any type, so as to implement type-safe data operations; 3. Use bounded type parameters such as limiting the type scope of generics to ensure type legality; 4. Wildcards ?, ?extendsT and ?superT respectively represent unknown types, upper bound and lower bound limitations, following the PECS principle (producers use extends, consumers use super) to enhance flexibility; 5. Generic methods can define type parameters independently of class, support

Jul 28, 2025 am 02:59 AM

A Comprehensive Look at Java I/O and NIO.2

FormodernfileI/OinJava,useNIO.2(java.nio.file)asitprovidesamoreintuitive,feature-rich,andsaferAPIcomparedtotraditionalI/O;2.UsetraditionalI/Oonlyforlegacycodeorsimplestreamoperations,asitisblockingandlessscalable;3.UseNIOwithchannelsandselectorsforhi

Jul 28, 2025 am 02:47 AM

nio.2 Java I/O

Java Persistence with JPA and Hibernate: Best Practices and Patterns

Keep the entity class simple and implement equals/hashCode based on ID only; 2. Use lazy loading reasonably and cooperate with @EntityGraph or DTO to avoid N 1 queries; 3. Use @Transactional to manage transactions, read operation mark readOnly=true; 4. Use @Version to optimistically lock to prevent concurrent updates from being lost; 5. Cascade operations need to clearly specify the type to avoid abuse of CascadeType.ALL. Following these practices can significantly improve the performance and maintainability of JPA Hibernate applications.

Jul 28, 2025 am 02:46 AM

java

what is garbage collection in java

Java's garbage collection mechanism automatically manages memory, identifying and freeing objects that are no longer in use to avoid memory leaks. 1. Use accessibility analysis to determine whether the object is garbage; 2. Common recyclers include SerialGC, ParallelGC, CMS, G1, ZGC and Shenandoah; 3. Developers can optimize GC performance by reasonably setting the heap size, avoiding memory leaks, optimizing object life cycle, monitoring GC behavior, etc.

Jul 28, 2025 am 02:45 AM

java Garbage collection

A Guide to Java NIO and Asynchronous I/O

JavaNIO and Asynchronous I/O are suitable for high concurrency and I/O intensive scenarios. 1. NIO is based on buffers, channels and selectors, and supports non-blocking I/O and single-thread management of multiple connections; 2. AIO is truly asynchronous through asynchronous channels and callbacks or Future, and is completed by the operating system notification; 3. NIO is stable across platforms and is suitable for most high concurrency services. AIO performs better but complex on specific platforms; 4. When using it, pay attention to buffer management, thread safety, resource release and backpressure issues. It is recommended to give priority to using mature frameworks such as Netty to reduce complexity, and finally select a suitable model based on performance requirements and platform characteristics.

Jul 28, 2025 am 02:44 AM

Deep Dive into Java Garbage Collection: G1 vs ZGC

G1GC and ZGC are two modern garbage collectors in Java, and the choice depends on application requirements. 1.G1 is suitable for scenarios where the heap size is between 4GB and about 1TB, can accept pauses within 200ms, priority is given to throughput, and runs in JDK7; 2. ZGC is suitable for low-latency systems that require stable pauses below 10ms, heaps exceed 32GB or even up to 16TB, running in JDK15 and able to withstand higher CPU overhead; ultimately, benchmarking should be carried out through GC log analysis tools for real workloads (such as GCViewer or ZGC statistics) to determine the best choice.

Jul 28, 2025 am 02:44 AM

Optimizing Memory Usage in Java Applications

UseefficientdatastructureslikeArrayListoverLinkedListandprimitivecollectionstoreduceoverhead;2.Minimizeobjectcreationbyreusingobjects,usingStringBuilderforconcatenation,andcachingexpensiveobjects;3.Preventmemoryleaksbynullifyingreferences,usingstatic

Jul 28, 2025 am 02:40 AM

java Memory management

Java Application Monitoring with Prometheus and Grafana

Use Micrometer to expose metrics in Java applications. By adding dependencies and configuring SpringBootActuator, the application outputs monitoring data in Prometheus format at the /actuator/prometheus endpoint; 2. Configure Prometheus' scrape_configs, add job_name to 'java-app' crawling task, specify metrics_path and targets to regularly collect Java application metrics, and verify the acquisition status through Prometheus' Targets page; 3. Start Grafana and add Prometheus as the data source

Jul 28, 2025 am 02:37 AM

java monitor

How to Handle Nulls Effectively in Modern Java

UseOptionalforreturntypestosignalpotentialabsence,avoidingitforparametersandfields;2.ValidateinputsearlywithObjects.requireNonNull()tofailfast;3.Apply@Nullableand@NonNullannotationstoimprovestaticanalysisandcodeclarity;4.Leveragesafeutilitymethodslik

Jul 28, 2025 am 02:27 AM

Best Practices for Testing Java Applications with Spring Boot

Useappropriatetestsliceslike@WebMvcTestforcontrollers,@DataJpaTestforrepositories,andavoid@SpringBootTestunlessfullcontextisneeded.2.PreferunittestswithMockitoforservicelayerstokeeptestsfastandisolated.3.Use@SpringBootTestwith@AutoConfigureTestDataba

Jul 28, 2025 am 02:25 AM