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
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--
--
*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
