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Advanced Java Generics for Type Safety

Advanced applications of Java generics include: 1. Use generic methods and wildcards to improve flexibility, such as

Jul 29, 2025 am 02:06 AM

java Generics

Java Code Quality and Static Analysis with SonarQube

SonarQube is an open source code quality management platform used to detect code defects, security vulnerabilities, code odors, duplicate code in more than 20 languages such as Java, and evaluate test coverage and complexity. 1. Install the SonarQube server and access http://localhost:9000 to complete initialization; 2. Configure the SonarScanner tool or use the Maven/Gradle plug-in; 3. Create a sonar-project.properties file in the project root directory, specify the project information, source code path, compilation output and test report path; 4. Use Jacoco to generate a test coverage report and insert it through Maven.

Jul 29, 2025 am 02:03 AM

java Code quality

Event-Driven Architecture in Java with Apache Kafka

Event-DrivenArchitectureinJavawithApacheKafkaenablesscalable,looselycoupledsystemsbyusingeventsforasynchronouscommunication.1.Producerspublisheventstotopics,andconsumersreactwithoutdirectdependencies.2.Kafkaprovidesdurable,partitionedlogswithreplayab

Jul 29, 2025 am 02:02 AM

Implementing Design Patterns in Enterprise Java Applications

UselayeredarchitecturewithMVCinthepresentationlayer,ServiceLayerPatterninbusinesslogic,andDAOindataaccesstoensureseparationofconcernsandmaintainability.2.ApplycreationalpatternslikeSingleton(viaSpringbeans)andFactory(enhancedwithSpring’s@Qualifier)to

Jul 29, 2025 am 02:02 AM

java Design Patterns

Securing REST APIs in Java with Spring Security and JWT

Use SpringSecurity and JWT to implement secure authentication and authorization of RESTAPI in Java, suitable for stateless and scalable architectures such as microservices, mobile applications and single-page applications; 2. First add SpringBootWeb, SpringSecurity and JJW dependencies in pom.xml; 3. Create User and LoginRequest model classes for user information and login requests; 4. Write JwtUtil tool class to generate, parse and verify JWT, note that the key should be configured through environment variables rather than hard coded; 5. Config the SecurityConfig class to disable CSRF, set stateless session policies, release the authentication interface and register JW

Jul 29, 2025 am 02:01 AM

Working with JSON in Java using Jackson and Gson

Jackson and Gson are two mainstream libraries in Java that handle JSON, both supporting the mutual conversion of objects and JSON. 2. Before using it, you need to add the corresponding dependencies in Maven: Jackson uses jackson-databind, and Gson uses gson. 3. In the basic serialization deserialization operation, Jackson is implemented through ObjectMapper and Gson is completed through Gson instance. 4. When processing generic collections, Jackson uses TypeReference and Gson uses TypeToken. 5. When custom serialization, Jackson supports rich annotations (such as @JsonProperty, @Jso

Jul 29, 2025 am 02:01 AM

java json

Java Performance Profiling with JFR and VisualVM

JFR and VisualVM are an efficient combination of Java performance analysis. JFR is responsible for low overhead to collect JVM running data, and VisualVM is used for visual analysis. 1. Enable JFR to enable it by adding the -XX: FlightRecorder parameter at startup or using the jcmd command during operation. It is recommended to use the profile template to obtain more detailed events. 2. Use the jcmd command to set parameters such as duration and filename for timed recording, or you can accurately control the acquisition event through custom .jfc files. 3. VisualVM needs to install the community enhancement version and add the JFR plug-in. After loading the .jfr file, you can use Overview and Telemet.

Jul 29, 2025 am 01:32 AM

java performance

Mastering Unit and Integration Testing in Java with JUnit 5 and Mockito

TomasterJavatestingwithJUnit5andMockito,useunittestsforisolatedcodewithmockeddependenciesandintegrationtestsforrealcomponentinteractions.1.Unittestsfocusonsinglemethodsorclassesusing@Mockand@InjectMockstoisolatelogic.2.Integrationtestsvalidatefullwor

Jul 29, 2025 am 01:24 AM

Unit Testing and Mocking in Java with JUnit 5 and Mockito

Use JUnit5 and Mockito to effectively isolate dependencies for unit testing. 1. Create a mock object through @Mock, @InjectMocks inject the tested instance, @ExtendWith enables Mockito extension; 2. Use when().thenReturn() to define the simulation behavior, verify() to verify the number of method calls and parameters; 3. Can simulate exception scenarios and verify error handling; 4. Recommend constructor injection, avoid over-simulation, and maintain test atomicity; 5. Use assertAll() to merge assertions, and @Nested organizes the test scenarios to improve test maintainability and reliability.

Jul 29, 2025 am 01:20 AM

java unit test

The Foreign Function & Memory API in Java 21

Java21 introduces Foreign Function & MemoryAPI to solve the complexity, poor security, and large performance overhead of JNI; 2. Core components include MemorySegment (memory abstraction), ValueLayout/MemoryLayout (memory layout), SymbolLookup (function symbol search), FunctionDescriptor and MethodHandle (function call definition), Arena (memory life cycle management); 3. Pure Java code can safely and efficiently call local functions and operate off-heap memory, without writing C code or manually managing memory; 4. Compared with JN

Jul 29, 2025 am 01:16 AM

java api

Serverless Java with AWS Lambda

Using Java to implement a serverless architecture on AWSLambda is feasible and efficient, and the key is reasonable optimization. 1. Use Java17 (Corretto) for best performance and language features; 2. Reduce cold start time by up to 90% by enabling SnapStart (for Java11 and 17); 3. Use ProvisionedConcurrency to warm up instances to deal with traffic fluctuations; 4. Use MavenShade or GradleShadow plug-in to streamline deployment packages to avoid the introduction of redundant dependencies; 5. Use lightweight frameworks such as Quarkus and Micronaut, or use GraalVM to generate native images to accelerate startup; 6.

Jul 29, 2025 am 01:10 AM

java programming

Securing Java Web Applications with Spring Security

Authenticationverifiesuseridentity,whileauthorizationdeterminesaccessrights.2.Addspring-boot-starter-securitydependencyandconfigureSecurityConfigwithcustomSecurityFilterChainandUserDetailsServiceusingBCryptPasswordEncoderinproduction.3.ForRESTAPIs,di

Jul 29, 2025 am 01:03 AM

High-Performance Java Messaging with RabbitMQ

Toachievehigh-performanceRabbitMQmessaginginJava,youmustoptimizebothclientandbrokerconfigurations.1.UseconnectionandchannelpoolingviaCachingConnectionFactorywithacachedchannelpooltoreduceoverhead.2.Enablepublisherconfirmsasynchronouslyandusebatchconf

Jul 29, 2025 am 12:47 AM

Event Sourcing and CQRS Patterns in Java

Event traceability and CQRS are suitable for complex business systems. 1. Event traceability provides complete audit and time travel capabilities by saving event sequence reconstruction status, but increases query complexity; 2. CQRS separates read and write models to improve scalability and performance, but introduces final consistency; 3. In Java, AxonFramework can be implemented in combination with SpringBoot, using @Aggregate to process commands, @EventSourcingHandler updates status, and @EventHandler builds read models; 4. Applicable to scenarios that require high auditability and uneven read and write load, and is not suitable for simple CRUD systems; 5. Pay attention to event immutability, version control, final consistency processing and

Jul 29, 2025 am 12:34 AM

java