Hi,
David is right: you have interfaces/implementations present in two
classloaders.
From a general point of view, you shouldn't put any jar into the
karaf/lib folder.
If you install the war features:
features:install war
you will have the javax.servlet.* packages available (provided by
Geronimo Spec bundle).
So you can use Import-Package: javax.servlet*
For non-OSGi jar, you can:
- find the OSGified version of the jar. ServiceMix provides a large set
of wrap bundles:
http://repo1.maven.org/maven2/org/apache/servicemix/bundles/
- you can use the wrap deployer which create an OSGi bundle on the fly
using URL like wrap:mvn:.... or wrap:http:.... You can find more
information about the wrap bundle here:
http://karaf.apache.org/manual/2.1.99-SNAPSHOT/users-guide/deployer.html
Regards
JB
On 05/17/2011 07:48 AM, David Jencks wrote:
Your problem is that the servlet class is available from at least two bundles
or classloaders and the implementation in your app is wired up to a different
one from pax web. There may be easier ways to see this but you can run
investigate this in a debugger.
I'm pretty sure your problems are caused by putting the jars in karaf/lib and
modifying the packages exported by the framework. Instead, try to find or
create bundleized versions of the jars and deploy them as bundles. For
instance, you won't need the servlet api jar since pax web already needs them
installed... Some ee spec jars need to be modified to work in osgi: both
geronimo and servicemix have versions of these.
Others can probably give you more detailed advice on how to fix this...
david jencks
On May 16, 2011, at 9:36 PM, simplemind wrote:
I am new to this OSGi stuff and karaf, and I could really use some help
getting started.
I am trying to deploy a war bundle that uses resteasy servlet. Here are
steps I took:
1. installed karaf 2.2.1 on linux ubuntu machine, latest java, latest
everything
2. built hello.war with MANIFEST.MF headers as described in Pax Web Extender
docs
3. added jsr311-api-1.1.1.jar, resteasy-jaxrs-2.1.0.GA.jar, and
servlet-api-2.5.jar to karaf/lib/ and karaf/deploy/
4. added org.osgi.framework.system.packages.extra= javax.ws.rs.core,
org.jboss.resteasy.plugins.server.servlet, javax.servlet.http, javax.servlet
in karaf/etc/config.properties
5. dropped hello.war into karaf/deploy/
3 and 4 was to get rid of NoClassDefFound errors on trying to start
hello.war when I did 5. But then it got a class cast exception. The
problem is that the class it is trying to cast from implements the interface
it is trying to cast to, so I can't understand why the cast is failing?
Here is proof of that:
http://docs.jboss.org/resteasy/docs/2.0.0.GA/javadocs/org/jboss/resteasy/plugins/server/servlet/HttpServletDispatcher.html
And here is the exception from the karaf log file:
java.lang.ClassCastException:
org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher cannot be
cast to javax.servlet.Servlet
at
org.ops4j.pax.web.extender.war.internal.RegisterWebAppVisitorWC.visit(RegisterWebAppVisitorWC.java:200)[75:org.ops4j.pax.web.pax-web-extender-war:1.0.1]
at
org.ops4j.pax.web.extender.war.internal.model.WebApp.accept(WebApp.java:583)[75:org.ops4j.pax.web.pax-web-extender-war:1.0.1]
at
org.ops4j.pax.web.extender.war.internal.WebAppPublisher$HttpServiceListener.register(WebAppPublisher.java:170)[75:org.ops4j.pax.web.pax-web-extender-war:1.0.1]
...
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