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(ApplicationContext.java:1402)
>
> at
> org.apache.catalina.core.ApplicationContext.addListener(ApplicationContext.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.am...@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 =
>> 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 = new Tomcat();
>> tomcat.setPort(8080);
>> File base = new File("target/webapp-runner");
>> if(!base.exists()) {
>> base.mkdirs();
>> }
>> Context ctx = 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.caldar...@unisys.com> wrote:
>>>> From: John D. Ament [mailto:john.d.am...@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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