Executing a Java class at application startup using Spring MVC [duplicate]

Question

What is the best way to execute a Java class at application startup using Spring MVC ?

Answer 1

There's not necessarily a "best" way. As usual, there are many ways to do it, and the "best" is whichever fits into your project the best:

1. Use init-method="..." on a bean element in XML, as cjstehno mentioned
2. Implement Spring's InitializingBean interface. When deployed in an ApplicationContext, the afterPropertiesSet() method will be called when the bean is created.
3. Annotate a method on a bean with @PostConstruct. Again, if deployed to an ApplicationContext, the annotated method will be called when the bean is created.
4. If your bean is more of an infrastructure bean to be tied into the Spring lifecycle, implement ApplicationListener<ContextRefreshedEvent>. The onApplicationEvent(..) method will be called during Spring's startup, and you can do whatever work you need there.

Answer 2

Assuming your context is loaded on startup, create a bean in your spring application context with an init method explicitly called out in the XML config (or implement Springs InitializingBean). If you have lazy-loading enabled you will need to make sure this bean is not lazy.

<bean name="starter" init-method="start" class="com.my.StarterBean" lazy="false" /> 

(please double-check the params in the docs).

If your context is not loaded on startup you can register an server context listener (part of Servlet API, not Spring).