This article walks through setting up a Vagrant‑based experiment that injects an intentional infinite loop into a simple Spring MVC service, then demonstrates step‑by‑step how to identify the offending process using top, examine JVM heap with jstat, and trace the problematic thread with jstack to resolve a CPU‑100% issue.
This article walks through the Spring MVC internals, explaining how the @ResponseBody annotation triggers JSON serialization by tracing the DispatcherServlet, HandlerAdapters, and ReturnValueHandlers, and includes runnable Spring Boot test code to illustrate the processing flow.
This article introduces a lightweight Java wrapper around Alibaba's EasyExcel library that enables one‑line Excel import and export, explains required Maven dependencies, essential utility classes, and provides complete code examples for reading, writing single‑sheet and multi‑sheet workbooks with custom model mappings.
This tutorial walks through creating a miniature Spring MVC framework using only the JDK, covering custom annotations, package scanning, component instantiation, dependency injection, URL mapping, and a custom DispatcherServlet, with complete code structure and runtime demonstration.
This article explains how Spring MVC uses @RequestBody to deserialize JSON request bodies into Java objects and @ResponseBody to serialize Java objects back to JSON, providing clear code examples, curl testing, and notes on @RestController behavior.
This article explains the differences between synchronous, asynchronous, blocking and non‑blocking execution, illustrates their combinations with real‑world analogies, and provides practical guidance on applying servlet async, Spring MVC async, full‑chain async, HTTP client async and database async techniques to improve Java backend throughput and CPU utilization.
This article explains how to design and implement robust Java exception handling for business systems using Spring MVC, covering when to create custom exceptions, how to structure service and controller code, and how to centralize error responses with @ControllerAdvice for clean, maintainable backend development.
This tutorial walks Java backend developers through the complete process of understanding Spring MVC’s request flow, designing a custom MVC framework, and implementing core components such as DispatcherServlet, annotations, and handler mappings with full code examples and deployment instructions.
This article explains the SSM framework, detailing how Spring MVC, Spring, and MyBatis are integrated into a standard MVC architecture, describing their roles, underlying principles, and step‑by‑step guidance for building a functional feature with entities, mappers, services, controllers, and JSP views.
This article explains various ways to obtain the HttpServletRequest object in a Spring MVC web application, evaluates their thread‑safety through concurrent testing, and compares the advantages and drawbacks of each approach to help developers choose the most efficient solution.
This article provides a step‑by‑step tutorial on using Apache Shiro for authentication, authorization, session management and encryption in a Java web project, covering Maven dependencies, custom Realm implementation, Spring XML configuration, servlet filter setup, controller logic, JSP login page, demo screenshots and common pitfalls.
This article explains how to implement a shopping cart in Java by handling four login scenarios, defining BuyerCart and BuyerItem beans, using JavaScript and Spring MVC controllers to add items, persisting cart data in cookies or Redis, converting objects to JSON with ObjectMapper, managing sessions, and validating stock before checkout.
This article provides a step‑by‑step tutorial on building a Spring container, configuring Spring MVC with DispatcherServlet, setting up essential beans such as multipartResolver, custom handler mapping, handler adapter, view resolver, component scanning, and finally integrating MyBatis with SqlSessionFactoryBean and SqlSessionTemplate for a complete Java backend solution.
This article provides an in‑depth overview of Spring MVC annotations such as @Controller, @RequestMapping, @Autowired, @Resource, @ModelAttribute, @SessionAttributes, @PathVariable, and @RequestParam, explaining their purposes, configuration methods, attribute injection rules, and advanced usage with practical code examples.
This article explains how to add multipart file‑upload support to Spring Cloud Feign by extending the client with feign‑form, configuring the server side with a Spring MVC controller, and providing a complete Java example with dependencies, client configuration, and a JUnit test.
This article demonstrates how to implement page-based data retrieval in a Java web application using Spring MVC, MyBatis, and a custom Page utility class, covering the creation of the pagination class, mapper XML, DAO interfaces, service logic, controller handling, and JSP pagination controls.
This article explains how Spring MVC uses annotations such as @RequestMapping, @PathVariable, @RequestParam and @CookieValue to map URLs, retrieve parameters, implement RESTful CRUD operations via hidden method filters, and provides complete code examples for each scenario.
This tutorial walks through creating a Maven project in IntelliJ IDEA, configuring Maven settings, adding required dependencies, setting up Spring, MyBatis, FreeMarker, Log4j, and web.xml, and integrating Spring MVC to build a complete SSM framework application.
This tutorial walks through setting up a Spring MVC environment with Eclipse, Tomcat, and JDK, importing required JARs, configuring web.xml and springmvc.xml, writing a HelloWorld controller, creating JSP views, and handling common issues such as static resource mapping and server integration.
This guide walks you through installing and configuring the ELK stack (Elasticsearch, Logstash, Kibana), setting up the required environment, creating Logback and Logstash configurations, and integrating them with a Spring MVC application to collect and visualize Java logs in Kibana.
This article explains the difference between synchronous and asynchronous request handling in web servers, demonstrates how Spring MVC leverages DeferredResult and WebAsyncTask for non‑blocking processing, and shows practical code for timeout and exception management in Java backend applications.
This guide walks through integrating QQ login into a Spring MVC Java application, covering environment setup, domain and callback configuration, SDK deployment, common pitfalls like non‑80‑port issues, configuration file settings, Maven dependency handling, SSL fixes, and provides a complete controller example.
This tutorial explains why Dubbo was created for large‑scale distributed services, how it solves URL management, load‑balancing and capacity‑planning challenges, and provides step‑by‑step instructions for integrating Dubbo with Zookeeper, dubbo‑admin, and Spring MVC using Maven and Java code.
This article explains how browsers cache resources, the role of HTTP response headers such as Last-Modified, Expires, Cache-Control, ETag, and Age, and provides practical examples of controlling cache behavior with Spring MVC code and detailed Nginx configuration for both static and proxy caching.
This article introduces JSR‑303 Bean Validation, lists required JARs, explains core constraint annotations for null, boolean, size, date, and numeric checks, and provides complete Java code examples demonstrating how to apply and test these validations in a Spring MVC environment.
This comprehensive guide explains what Spring is, its advantages, core modules, container architecture, bean factories, dependency injection types, bean scopes, lifecycle, AOP concepts, MVC framework, data access support, and transaction management, providing a solid foundation for Java backend development.
The article explains how a Spring MVC service bean was duplicated across root and child WebApplicationContexts, causing a null‑injected instance that triggered a NullPointerException, and shows how JMap and JHat were used to locate the two beans and resolve the issue by adjusting component‑scan filters or removing the @Service annotation.
This article explains how Spring MVC integrates web capabilities by configuring web.xml, initializing the root WebApplicationContext via ContextLoaderListener, creating a child context for DispatcherServlet, and managing the hierarchical relationship between the two contexts to share beans across a Java web application.
