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I know that getWebApplicationContext() finds the root WebApplicationContext through the ContextLoaderListener or ContextLoaderServlet
But I need to know the difference and when to use it?
The javadoc for ContextLoaderServlet says it all:
Apparently prior to Servlet API 2.4 the order in which listeners versus servlets are initialized is not mandated by the specification. So to ensure that the Spring context is correctly loaded before any other servlets in a Servlet 2.3 and lower container, you would need to use ContextLoaderServlet and put it as the first to load on startup. Check out that link for further details.