Ivano,
On 12/27/24 11:48 AM, Ivano Luberti wrote:
> Tomcat version is 9.0.96
>
> I have two questions:
>
> 2) The docs
(https://tomcat.apache.org/tomcat-9.0-doc/servletapi/javax/
servlet/ServletContextListener.html) state that
>
>> All servlets and filters have been destroyed before any
ServletContextListeners are notified of context destruction.
>>
> Now in my code I have a servlet class (MyServletClass) that
implements ServletContextListener and contextDestroyed
>
> and another not servlet class (say MyClass) that implements those as
well.
You have a Servlet that implements ServletContextListener, and also
includes a contextDestroyed(ServletContextEvent) method? Okay.
> Using breakpoints I see that MyClass.contextDestroyed called BEFORE
MyServletClass.contextDestroyed
>
> and for what I understand it should be the other way around.
For what reason? If they are both implementing ServletContextListener,
they should both be called. But there is no guarantee of the order in
which they are called.
The fact that one of them is a Servlet is not relevant.
> 2) I cannot find documentation on this matter.
The Servlet Specification is what you are looking for. The one relevant
for all supported Tomcat 9 versions is Servlet 4.0 which can be found here:
https://javaee.github.io/servlet-spec/downloads/servlet-4.0/servlet-4_0_FINAL.pdf
> a) if I have more than one class (neither servlet) implementing
ServletContextListener interface in which order the contextDestroyed
method is called?
How are you registering your event listeners? If you register them in
WEB-INF/web.xml then they will be invoked in the order in which they
appear in web.xml. Initialization notifications will be sent in top-down
order and destruction notifications will be sent in bottom-up order.
If you are using @Annotations, then I don't believe an order can be
specified because there is no guaranteed order of .jar-file processing
and/or .class-file processing when searching for annotations.
> b) if I have more than one servlet class implementing
ServletContextListener interface in which order the contextDestroyed
method is called?
There is no Servlet.contextDestroyed method defined, so it will never be
called by the container (Tomcat). If you happen to have a class which
implements both interfaces, then the container will invoke the right
methods at the right times, but don't think that because you have a
Servlet that is also a ServletContextListener that Tomcat will call
contextDestroyed on it earlier than any other ServletContextLsistenrt
just because it's a Servlet.
From Tomcat's perspective, it's just a ServletContextListener like any
other. I would bet that you get two separate instances of that class in
memory, as well: one to serve as the Servlet and another to serve as the
ServletContextListener. Forcing them to be the same object might be
difficult to accomplish.
-chris
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