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https://issues.apache.org/jira/browse/CAMEL-3941?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13029252#comment-13029252
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Willem Jiang commented on CAMEL-3941:
-------------------------------------
Hi Piotr,
Did you install the servlet api 3.0?
If so, please uninstall it from servicemix.
CXFServlet should supports servlet 2.5, if there is no servlet 3.0 API, it will
not create the Servlet3ContinuationProvider.
Willem
> Camel-cxf dependencies problem as: jetty-7.3.1 is servlet-2.5 and cxf-2.4.0
> is servlet-3.0 dependent
> ----------------------------------------------------------------------------------------------------
>
> Key: CAMEL-3941
> URL: https://issues.apache.org/jira/browse/CAMEL-3941
> Project: Camel
> Issue Type: Bug
> Components: build system, camel-cxf
> Affects Versions: 2.8.0
> Environment: Apache ServiceMix 4.4-SNAPSHOT
> Reporter: Piotr Klimczak
> Labels: camel, cxf, jetty, servlet, specification
>
> Probably because of this: https://issues.apache.org/jira/browse/CAMEL-3784 i
> have a problem with CXF dependencies in Camel as:
> 1. Camel 2.8 uses CXF 2.4.0 and Jetty 7.3.1
> 2. CXF 2.4.0 uses servlet 3.0
> 3. Jetty 7.x.x uses servlet 2.5
> Let's take a look at my example:
> {code:xml}
> <bean id="sampleBean" class="com.acme.Service" />
> <cxfEndpoint id="acmeService" address="/acmeService"
> serviceClass="#sampleBean" xmlns="http://camel.apache.org/schema/spring"; />
> <camelContext id="testContext" trace="true" streamCache="false"
> xmlns="http://camel.apache.org/schema/spring"; >
> <route>
> <from uri="cxf:bean:acmeService" />
> <bean ref="sampleBean" />
> </route>
> </camelContext>
> {code}
> Quite simple isn't it?
> But how come that we have Servlet spec version conflict? Let's take a look at
> class CXFConsumer of camel-cxf component:
> Around the lines 66 we have:
> {code}
> if (!endpoint.isSynchronous() && (continuation =
> getContinuation(cxfExchange)) != null) {
> LOG.trace("Calling the Camel async processors.");
> return asyncInvoke(cxfExchange, continuation);
> } else {
> {code}
> so if we use async API (set as default) it will try to pickup the
> Continuation as you can see around 111 line:
> {code}
> private Continuation getContinuation(Exchange cxfExchange) {
> ContinuationProvider provider =
>
> (ContinuationProvider)cxfExchange.getInMessage().get(ContinuationProvider.class.getName());
> return provider == null ? null : provider.getContinuation();
> }
> {code}
> The ContinuationProvider contains value of class
> Servlet3ContinuationProvider(cxf-rt-transports-http) which is Servlet 3.0
> ready only!
> Let's go further to see what is happening in
> Servlet3Continuation(cxf-rt-transports-http) class:
> {code}
> HttpServletRequest req;
> //some code
> final AsyncContext context;
> //some code
> context = req.startAsync(req, resp);
> {code}
> If you take a closer look at AsyncContext class you will see that cxf 2.4.0
> is expecting this class to be javax.servlet.AsyncContext type.
> BUT jetty 7 returns org.eclipse.jetty.server.AsyncContext which is
> incompatible.
> The worse thing is, that *req* value of type org.eclipse.jetty.server.Request
> that implements HttpServletRequest is expecting the HttpServletRequest to be
> 3.0 Servlet spec but is the 2.5 servlet spec one.
> All of this causes:
> {code}
> Caused by: java.lang.AbstractMethodError:
> org.eclipse.jetty.server.Request.startAsync(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;)Ljavax/servlet/AsyncContext;
> at
> org.apache.cxf.transport.http.Servlet3ContinuationProvider$Servlet3Continuation.<init>(Servlet3ContinuationProvider.java:77)[142:org.apache.cxf.bundle:2.4.0]
> at
> org.apache.cxf.transport.http.Servlet3ContinuationProvider.getContinuation(Servlet3ContinuationProvider.java:58)[142:org.apache.cxf.bundle:2.4.0]
> at
> org.apache.camel.component.cxf.CxfConsumer$1.getContinuation(CxfConsumer.java:114)[205:org.apache.camel.camel-cxf:2.8.0.SNAPSHOT]
> at
> org.apache.camel.component.cxf.CxfConsumer$1.invoke(CxfConsumer.java:66)[205:org.apache.camel.camel-cxf:2.8.0.SNAPSHOT]
> at
> org.apache.cxf.interceptor.ServiceInvokerInterceptor$1.run(ServiceInvokerInterceptor.java:58)[142:org.apache.cxf.bundle:2.4.0]
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)[:1.6.0_24]
> at
> java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)[:1.6.0_24]
> at java.util.concurrent.FutureTask.run(FutureTask.java:138)[:1.6.0_24]
> at
> org.apache.cxf.workqueue.SynchronousExecutor.execute(SynchronousExecutor.java:37)[142:org.apache.cxf.bundle:2.4.0]
> at
> org.apache.cxf.interceptor.ServiceInvokerInterceptor.handleMessage(ServiceInvokerInterceptor.java:106)[142:org.apache.cxf.bundle:2.4.0]
> ... 34 more
> {code}
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