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Date: Tue, 1 Jul 2014 12:16:17 -0400
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Subject: Re: Embedded Tomcat question
From: "John D. Ament" <john.d.ament@gmail.com>
To: Tomcat Users List <users@tomcat.apache.org>
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I looked for the source code, at least on github, there's no tag for
7.0.55 defined (see [1])

How do I get access to a StandardContext?  CAn I cast the Context object?

[1]: https://github.com/apache/tomcat

On Mon, Jun 30, 2014 at 4:51 AM, Mark Thomas <markt@apache.org> wrote:
> On 30/06/2014 01:27, John D. Ament wrote:
>> I spoke a little too quickly, ServletContext is avilable from ctx
>> (just didn't search hard enough).  Adding the request listener here
>> though results in:
>>
>> java.lang.NullPointerException
>>
>>         at org.apache.catalina.core.ApplicationContext.createListener(Ap=
plicationContext.java:1402)
>>
>>         at org.apache.catalina.core.ApplicationContext.addListener(Appli=
cationContext.java:1307)
>>
>>         at org.apache.catalina.core.ApplicationContextFacade.addListener=
(ApplicationContextFacade.java:636)
>
> A quick look in the source code will tell you why you are getting an NPE
> here.
>
> You can't add a ServletRequestListener directly. There are a couple of
> ways to do this. Probably the simplest is to create a
> ServletContextListener, add that directly to Tomcat's StandardContext
> with addApplicationLifecycleListener() and then from that
> ServletContextListener add and request and/or session listeners from the
> contextInitialized() event.
>
> You could also do this with a ServletContainerInitializer.
>
> Mark
>
>
>>
>> On Sun, Jun 29, 2014 at 8:21 PM, John D. Ament <john.d.ament@gmail.com> =
wrote:
>>> Hi,
>>>
>>> I'm on Tomcat 7.0.54, though I would hope your APIs aren't volatile
>>> enough that your internals should matter..
>>>
>>> I tried this:
>>>
>>> Wrapper wrapper =3D
>>> Tomcat.addServlet(ctx,"Greeter",GreeterServlet.class.getName());
>>> wrapper.addMapping("/*");
>>> wrapper.getServlet().getServletConfig().getServletContext().addListener=
(MyListener.class);
>>>
>>> This results in a NPE.  This makes me think I don't have access to the
>>> context yet.  I would actually think it's somewhere in this chain:
>>>
>>>         tomcat =3D new Tomcat();
>>>         tomcat.setPort(8080);
>>>         File base =3D new File("target/webapp-runner");
>>>         if(!base.exists()) {
>>>             base.mkdirs();
>>>         }
>>>         Context ctx =3D tomcat.addContext("/",base.getAbsolutePath());
>>>
>>> however, it doesn't look like Context here is a ServletContext.
>>>
>>>
>>> On Sun, Jun 29, 2014 at 6:30 PM, Caldarale, Charles R
>>> <Chuck.Caldarale@unisys.com> wrote:
>>>>> From: John D. Ament [mailto:john.d.ament@gmail.com]
>>>>> Subject: Embedded Tomcat question
>>>>
>>>>> Playing around a bit with embedded tomcat.  It looks like there are
>>>>> APIs to add all of the tomcat specific listeners, however how would I
>>>>> add a ServletRequestListener?
>>>>
>>>> Look in the servlet spec for the version of Tomcat you're using (which=
 you didn't mention), and the JavaDoc for ServletContext (e.g., addListener=
).
>>>>
>>>>  - Chuck
>>>>
>>>>
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>>>>
>>>>
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