javaservletsjakarta-eegrizzlyservlet-listeners

How to add ServletContainerInitializer to Grizzly WebappContext?

I create Grizzly WebappContext this way:

WebappContext webContext = new WebappContext("WebappContext", "");

And I have MyInitializer that implements ServletContainerInitializer. How can I add this initializer to webContext? I tried this way:

webContext.addListener(new MyInitializer());

But MyInitializer.onStartup method is never called. How to do it?

Solution

  • ServletContainerInitializer is based on Service Provider Interface (SPI) concept. Implementation of ServletContainerInitializer interface must be configured in META-INF/services/javax.servlet.ServletContainerInitializer file. This jar contains a listener must be in WEB-INF/lib of a ServletContainer.

    webContext.addListener will serve your needs but the given listener must be an instance of one or more of the following interfaces:

    - javax.servlet.ServletContextAttributeListener
- javax.servlet.ServletRequestListener
- javax.servlet.ServletRequestAttributeListener
- javax.servlet.http.HttpSessionListener
- javax.servlet.http.HttpSessionAttributeListener