Sorry I didn't mean to say ActionServlet or ModuleConfig objects...these are
struts based objects.. more generally, from within a Tomcat web
application... how do you access the Context object?
Thanks
Jamie
jamieb wrote:
>
> Hi There
>
> I had a look at Tomcat's Manager application.... the reload(..) function
> reveals a hint:
> ..
> Context context = (Context) host.findChild(path);
> ..
> context.reload();
>
> This should do the trick? Any idea on how to get the tomcat context
> object... from ActionServlet or ModuleConfig objects...? I am not familar
> with Tomcat's object model.
>
> Many thanks
>
> Jamie
>
>
> /**
> * Reload the web application at the specified context path.
> *
> * @param writer Writer to render to
> * @param path Context path of the application to be restarted
> */
> protected void reload(PrintWriter writer, String path) {
>
> if (debug >= 1)
> log("restart: Reloading web application at '" + path + "'");
>
> if ((path == null) || (!path.startsWith("/") && path.equals("")))
> {
> writer.println(sm.getString("managerServlet.invalidPath",
> RequestUtil.filter(path)));
> return;
> }
> String displayPath = path;
> if( path.equals("/") )
> path = "";
>
> try {
> Context context = (Context) host.findChild(path);
> if (context == null) {
> writer.println(sm.getString
> ("managerServlet.noContext",
> RequestUtil.filter(displayPath)));
> return;
> }
> // It isn't possible for the manager to reload itself
> if (context.getPath().equals(this.context.getPath())) {
> writer.println(sm.getString("managerServlet.noSelf"));
> return;
> }
> context.reload();
> writer.println
> (sm.getString("managerServlet.reloaded", displayPath));
> } catch (Throwable t) {
> log("ManagerServlet.reload[" + displayPath + "]", t);
> writer.println(sm.getString("managerServlet.exception",
> t.toString()));
> }
>
> }
>
>
> Pid-2 wrote:
>>
>> jamieb wrote:
>>> Hi
>>>
>>> Thanks for the tip. While I am very grateful for your advice, I am not
>>> sure
>>> I like either of the approaches. I was hoping just to call a Tomcat API
>>> function directly from my web application.
>>
>> Tomcat provides an API, in the form of JMX.
>>
>>> Is'nt there a method called restart() or something?
>>
>> I'm not aware of one, have you found one in the docs?
>>
>>> JMX seems like overkill since I do not need to
>>> control the application remotely. The application doing the calling is
>>> the
>>> application that needs to be restarted itself. Any further ideas?
>>
>> You haven't elaborated on how you're connecting to the box, but a simple
>> JMX app could be run from the command line, or another webapp on the
>> same server.
>>
>> I'd suggest that you would be better off if a different app called the
>> restart, as you'll never be able to recover (or notify afterwards) from
>> a failure if the app itself is down.
>>
>> p
>>
>>
>>
>>
>>> Thanks
>>> Jamie
>>>
>>>
>>> Pid-2 wrote:
>>>> jamieb wrote:
>>>>> Hi there
>>>>>
>>>>> I am busy implementing an auto update facility for a Tomcat web
>>>>> application.
>>>>> As part of the auto update process, the auto update code needs to
>>>>> unpack
>>>>> the
>>>>> changed class files and reload the Tomcat web application.
>>>>>
>>>>> I am aware that you can configure Tomcat to automatically reload the
>>>>> web
>>>>> application when class files are changed. I've decided against the use
>>>>> of
>>>>> this functionality for fear of unscheduled service disruption.
>>>>>
>>>>> My question: Is recommended way for a web application to apply an
>>>>> update
>>>>> to
>>>>> itself and restart itself? Is there an API call to reload the current
>>>>> Tomcat
>>>>> web application from within that application?
>>>> If app auto-reload facilities are switched off, you should be able to
>>>> replace WAR files safely*, and then use the built in JMX stuff to
>>>> restart the webapp in question.
>>>>
>>>> (* If you're doing it from a remote location, be sure to send it to a
>>>> safe directory /then/ do an internal copy to replace the file, rather
>>>> than directly uploading to the target web app dir. Failed or slow
>>>> uploads won't cause problems then.)
>>>>
>>>>
>>>>
>>>> You can also use the included Tomcat Ant tasks, I think, (see
>>>> bin/catalina-tasks.xml)
>>>>
>>>> See also:
>>>>
>>>> http://tomcat.apache.org/tomcat-6.0-doc/monitoring.html
>>>> http://tomcat.apache.org/tomcat-6.0-doc/mbeans-descriptor-howto.html
>>>>
>>>> The Tomcat manager app uses JMX AFAIK, so you could examine the source
>>>> code if you wanted to customise your own utility.
>>>>
>>>>
>>>> p
>>>>
>>>>
>>>>
>>>>
>>>>> Much appreciate
>>>>>
>>>>> Jamie
>>>>>
>>>>>
>>>>
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>>>>
>>>>
>>>>
>>>
>>
>>
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>>
>>
>>
>
>
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