Spring MVC
Integrate Spring MVC with Log4j
Integrating Log4j into a Spring MVC application is quite straightforward: include the Log4j library in your project dependencies, then create a log4j.properties file to define Log4j’s appenders and put it on the project classpath. This tutorial walks through that with the Log4j 1.x logging framework. Note: This post targets Log4j 1.x, which reached end of life in August 2015 and has known vulnerabilities (e.g. CVE-2019-17571, CVE-2021-4104). Treat it as a reference for maintaining legacy projects only. For anything new, prefer SLF4J + Logback (the default in Spring Boot) or Log4j 2.x. Their configuration and API differ entirely from what’s shown here, and the official link below now redirects to Log4j 2.
Unit Testing for Spring MVC Controllers
Once the services, DAO, and supporting classes are tested, it’s time for the controller. Controllers are often the hardest layer to test, so many developers (based on observation) reach for Selenium or, worse, test by hand. That works, but it makes exercising individual logic branches awkward and slow, and no one wants to wait for a browser to spin up before checking in code. The Spring MVC Test framework solves this by driving full controller logic through fast unit tests, and it has lived in Spring’s core ever since Spring 4.
Spring 4 MVC Hello World Tutorial Using Maven
In this tutorial we build the smallest useful Spring MVC application: a controller that reads a request parameter and renders it in a JSP view. It is the classic “Hello World”, but the wiring it shows (a DispatcherServlet, a bean configuration, and a view resolver) is the same wiring every larger Spring MVC application is built on. Note: This tutorial has been updated for Spring Framework 7. It was originally written in 2014 for Spring 4 and the javax.* servlet API; the configuration below now uses the jakarta.* namespace, drops the Eclipse-specific setup for a plain Maven command, and runs on Jakarta EE 11 (Tomcat 11+). We keep XML configuration and web.xml so every piece of the wiring stays visible. The same beans map one-to-one onto a @Configuration class if you prefer Java config.