Hi
I'm currently trying to implement an asynchronous jax-rs server (the client
will be doing some long-polling, waiting for events, so I don't want to lock
threads on the server).
My target environment is JOnAS 5.2.1 (using Tomcat7 container), but I'm first
trying to make it work on a vanilla Tomcat7 (for now I have the same issue on
both).
The error I have is a NPE :
Caused by: java.lang.NullPointerException
at
org.apache.cxf.jaxrs.impl.AsyncResponseImpl.<init>(AsyncResponseImpl.java:58)
at
org.apache.cxf.jaxrs.utils.JAXRSUtils.processParameter(JAXRSUtils.java:650)
at
org.apache.cxf.jaxrs.utils.JAXRSUtils.processParameters(JAXRSUtils.java:624)
at
org.apache.cxf.jaxrs.interceptor.JAXRSInInterceptor.processRequest(JAXRSInInterceptor.java:224)
at
org.apache.cxf.jaxrs.interceptor.JAXRSInInterceptor.handleMessage(JAXRSInInterceptor.java:94)
at
org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:271)
... 26 more
I'm trying to use CXF the (I think) simplest way with simple examples (see end
of mail).
I've been looking around in the code, from what I've understood, AsyncResponse
is supposed to work with either :
* jetty (provides a ContinuationProviderFactory on the bus)
* servlets 3.0 (checks existence of method "isAsyncSupported" on class
ServletRequest)
If neither of those conditions is met, then the NullPointerException should
happen.
However I'm using tomcat 7 and it's supposed to work via the servlets 3.0
support. So I'm guessing that maybe the servlet is still running on servlet 2.x
despites being on tomcat 7, maybe that it's because I'm using
org.apache.cxf.transport.servlet.CXFServlet ? Or I missed a switch somewhere ?
I'm quite stuck, but I'd really like to use this feature (asynchronous
server-side) for JAX-RS (and then to see if there is something similar for
JAX-WS).
Thanks in advance!!!
web.xml (to start cxf-servlet)
<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd";>
<servlet>
<servlet-name>CXFServlet</servlet-name>
<servlet-class>org.apache.cxf.transport.servlet.CXFServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>CXFServlet</servlet-name>
<url-pattern>/cxf/*</url-pattern>
</servlet-mapping>
</web-app>
cxf-servlet.xml (default spring definition)
<beans xmlns="http://www.springframework.org/schema/beans";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xmlns:jaxws="http://cxf.apache.org/jaxws";
xmlns:jaxrs="http://cxf.apache.org/jaxrs";
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
http://cxf.apache.org/jaxws
http://cxf.apache.org/schemas/jaxws.xsd
http://cxf.apache.org/jaxrs
http://cxf.apache.org/schemas/jaxrs.xsd";>
<import resource="classpath:META-INF/cxf/cxf.xml"/>
<import resource="classpath:META-INF/cxf/cxf-servlet.xml"/>
<jaxws:endpoint id="greeter"
implementor="com.mycompany.demo.StockQuoteReporter"
address="/StockQuoteReporter"/>
<jaxrs:server id="helloworlder"
serviceClass="demo.rs.server.HelloWorldResource"
address="/helloworld"/>
</beans>
HelloWorldResource.java
// some imports...
@Path("/say")
public class HelloWorldResource {
@GET
@Produces("text/plain")
public void helloWorld(AsyncResponse asyncResponse) {
asyncResponse.setTimeout(1000, TimeUnit.MILLISECONDS);
asyncResponse.setTimeoutHandler(new TimeoutHandler() {
public void handleTimeout(AsyncResponse ar) {
ar.resume("timeout");
}
});
}
}
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