Hello Achim,
Thank you very much again for responding. I wouldn't be so rude as to
send off a question without
looking up the documentation or the examples. A reason why I sent off
this question is that I couldn't
see anything different to what the whiteboard example was doing (just
like I do, the whiteboard example registers the httpcontext, registers
a servlet with this context, then registers another servlet without
the context):
public void start( final BundleContext bundleContext )
throws Exception
{
Dictionary props;
// register a custom http context that forbids access
props = new Hashtable();
props.put( ExtenderConstants.PROPERTY_HTTP_CONTEXT_ID, "forbidden" );
m_httpContextReg =
bundleContext.registerService(
HttpContext.class.getName(), new WhiteboardContext(), props );
// and an servlet that cannot be accessed due to the above context
props = new Hashtable();
props.put( ExtenderConstants.PROPERTY_ALIAS, "/forbidden" );
props.put( ExtenderConstants.PROPERTY_HTTP_CONTEXT_ID, "forbidden" );
m_forbiddenServletReg =
bundleContext.registerService( Servlet.class.getName(),
new WhiteboardServlet( "/forbidden" ), props );
props = new Hashtable();
props.put( "alias", "/whiteboard" );
m_servletReg =
bundleContext.registerService( Servlet.class.getName(),
new WhiteboardServlet( "/whiteboard" ), props );
Anyway, as you saw by my other question on the Karaf forum, it appears
that taking advantage of the Pax OSGi
wab functionality is a better option than using the OSGi http service,
so finding out why this doesn't work isn't so important to me anymore.
Thanks again for your help.
Gareth
On Tue, Jul 26, 2011 at 6:55 PM, Achim Nierbeck <[email protected]> wrote:
> Hi Gareth,
>
> I'll try to answer your questions inline so see below.
>
> regards, Achim
>
> Am 26.07.2011 16:28, schrieb Gareth Collins:
>>
>> Hello Achim,
>>
>> Thank you very much! In couldn't figure out what I was doing wrong!
>>
>> I have a couple of follow-ups if you don't mind.
>>
>> When I set up two servlets (one with a HttpContext, one without -> I
>> wanted to see if I could forward a request from one servlet to another
>> with filters using OSGi), I am getting the following exception:
>
> OK, well you are able to register Filters just like servlets.
> To get a better understanding on how pax web works you
> might take a look at the samples which are also used for the integration
> tests.
>
>>
>> 17:44:21,278 | DEBUG | lixDispatchQueue | pax-web-extender-whiteboard
>> | ? ? | 106 -
>> org.ops4j.pax.web.pax-web-extender-whiteboard - 1.0.4 | FrameworkEve
>> nt ERRORjava.lang.IllegalStateException: Http context already used.
>> Context params can be set only before first usage
>> at
>> org.ops4j.pax.web.service.internal.HttpServiceStarted.setContextParam(HttpServiceStarted.java:353)[62:org.ops4j.pax.web.pax-web-runtime:1.0.4]
>>
>> What could cause this? Here is my code:
>>
>> @Override
>> public void start(BundleContext context) throws Exception {
>> Hashtable<String,String> props = new
>> Hashtable<String,String>();
>>
>> props.put(ExtenderConstants.PROPERTY_HTTP_CONTEXT_ID,
>> "myServiceContext");
>> this.contextRegistration =
>> context.registerService(HttpContext.class.getName(), new
>> MyHttpContext(), props);
>> props = new Hashtable<String,String>();
>> props.put(ExtenderConstants.PROPERTY_ALIAS, "/myservice");
>> props.put(ExtenderConstants.PROPERTY_SERVLET_NAMES,"My
>> Servlet");
>> props.put(ExtenderConstants.PROPERTY_HTTP_CONTEXT_ID,
>> "myServiceContext");
>>
>> this.registration =
>> context.registerService(Servlet.class.getName(), new MyServlet(),
>> props);
>>
>> props = new Hashtable<String,String>();
>> props.put(ExtenderConstants.PROPERTY_SERVLET_NAMES,"Forward
>> Servlet");
>> props.put(ExtenderConstants.PROPERTY_ALIAS, "/forwardservlet");
>>>>
>>>> Exception called here>> this.forwardRegistration =
>>>> context.registerService(Servlet.class.getName(), new ForwardServlet(),
>>>> props);
>>
>> }
>
> Just giving it a quick glance right now, I'd think this is due to the fact
> that you try to register a servlet instead of a filter.
> Again take a look at the samples those might give you a better
> understanding.
> Another good resource for studying is the pax wicket project. There are also
> Samples that use the HTTP-Service quite a lot.
>
>>
>> Anything obvious I am doing wrong?
>>
>> As a final question on OSGi and http, I understand that in OSGi 4.2
>> support for web application bundles (which I understand PAX implements
>> for the major OSGi implementations?). Given this fact is there any
>> advantage to not use wab and stick with the base OSGi Http Service (+
>> PAX extensions)? From my research (I could be looking in the wrong
>> place), it doesn't appear that the base OSGi Http Service is used
>> widely (e.g. I haven't been able to find a serious security
>> implementation done using the HttpContext, just very basic examples).
>
> As I already mentioned Pax Web is the reference Implementation of a wab
> environment.
> Again taking a look at the samples you might find what you need.
>
>> Again, thank you for very much for your help!
>>
>> regards,
>> Gareth
>>
>>
>>
>> On Mon, Jul 25, 2011 at 5:38 PM, Achim Nierbeck<[email protected]>
>> wrote:
>>>
>>> Hi Gareth,
>>>
>>> sorry that it took me so long to answer.
>>> But I also am making it short :-)
>>>
>>> You are absolutely right you need to register Servlet and Context
>>> within the same bundle. The Whiteboard extension doesn't behave any
>>> different
>>> then the HTTP Service. The only difference and this really helps is
>>> that you just register you're own Servlet-Service where the whiteboard
>>> extension jumps in and does all the rest for you.
>>> With the classical HTTP Service you have to do all the work by yourself.
>>>
>>> Regards, Achim
>>>
>>>
>>> Am 23.07.2011 05:25, schrieb Gareth Collins:
>>>>
>>>> Hello,
>>>> I am trying to understand how to use the PAX Web Whiteboard correctly.
>>>> I was hoping, with the whiteboard pattern, I could completely separate
>>>> my code for auth (HttpContext) from my Servlet. I am currently using
>>>> PAX web 1.0.4 (which comes packaged with Karaf 2.2.2).
>>>>
>>>> So to test out the whiteboard pattern I created two bundles, each with
>>>> two java files:
>>>>
>>>> - Bundle1
>>>> + Activator.java - The activator start method:
>>>>
>>>> @Override
>>>> public void start(BundleContext context) throws Exception {
>>>> Hashtable<String,Object> props = new Hashtable<String,Object>();
>>>> props.put(ExtenderConstants.PROPERTY_HTTP_CONTEXT_ID, "myContext");
>>>> this.registration =
>>>> context.registerService(HttpContext.class.getName(), new
>>>> MyHttpContext(), props);
>>>> }
>>>> + MyHttpContext.java
>>>>
>>>> - Bundle2
>>>> + Activator.java - The activator start method:
>>>>
>>>> @Override
>>>> public void start(BundleContext context) throws Exception {
>>>> Hashtable<String,Object> props = new Hashtable<String,Object>();
>>>> props.put(ExtenderConstants.PROPERTY_ALIAS, "/myservice");
>>>> props.put(ExtenderConstants.PROPERTY_SERVLET_NAMES,"My Great
>>>> Servlet");
>>>> props.put(ExtenderConstants.PROPERTY_HTTP_CONTEXT_ID, "myContext");
>>>> this.registration =
>>>> context.registerService(Servlet.class.getName(), new MyHttpServlet(),
>>>> props);
>>>> }
>>>>
>>>> + MyHttpServlet.java
>>>>
>>>> When I try and run these two bundles in pax/karaf and access the web
>>>> page (http://localhost:8181/myservice), it doesn't work. I see in the
>>>> log the following:
>>>>
>>>> 15:51:56,778 | DEBUG | /profileservice | ServerModel
>>>> | eb.service.spi.model.ServerModel 296 | 61 -
>>>> org.ops4j.pax.web.pax-web-spi - 1.0.4 | Path [/myservice] does not
>>>> match any context
>>>>
>>>> I went back to the pax web whiteboard example and noticed that in the
>>>> example both the sample Servlet and sample HttpContext were defined in
>>>> the one bundle, so I changed my code to register MyHttpServlet and
>>>> MyHttpContext in one bundle...and it worked (the handleSecurity for
>>>> the context was called before running service on the Servlet)!
>>>>
>>>> So, given my testing, it appears that I need to register the servlet
>>>> and context together in the one bundle. Is that correct...or have I
>>>> misunderstood something (which is very possible as I am new to this
>>>> :))?
>>>>
>>>> If anyone could provide any guidance, it would be a big help.
>>>>
>>>> thanks in advance,
>>>> Gareth
>>>>
>>>> _______________________________________________
>>>> general mailing list
>>>> [email protected]
>>>> http://lists.ops4j.org/mailman/listinfo/general
>>>
>>> --
>>> --
>>> *Achim Nierbeck*
>>>
>>>
>>> Apache Karaf<http://karaf.apache.org/> Committer& PMC
>>> OPS4J Pax Web<http://wiki.ops4j.org/display/paxweb/Pax+Web/>
>>> Committer&
>>> Project Lead
>>> blog<http://notizblog.nierbeck.de/>
>>>
>>>
>>> _______________________________________________
>>> general mailing list
>>> [email protected]
>>> http://lists.ops4j.org/mailman/listinfo/general
>>>
>> _______________________________________________
>> general mailing list
>> [email protected]
>> http://lists.ops4j.org/mailman/listinfo/general
>
>
> --
> --
> *Achim Nierbeck*
>
>
> Apache Karaf<http://karaf.apache.org/> Committer& PMC
> OPS4J Pax Web<http://wiki.ops4j.org/display/paxweb/Pax+Web/> Committer&
> Project Lead
> blog<http://notizblog.nierbeck.de/>
>
>
> _______________________________________________
> general mailing list
> [email protected]
> http://lists.ops4j.org/mailman/listinfo/general
>
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