Hi, that NPE will happen if you haven't added an async-supported Servlet
parameter
Cheers, Sergey
On 08/08/13 08:42, ?????? wrote:
Hi,
I am trying to use Server api of Asynchronous Processing. I use
apache-cxf-2.7.5,apache-tomcat-6.0.37 and Java 6.
I use the example in jsr339-jaxrs-2.0-final-spec.pdf (page 51):
@Path("/async/longRunning")
public class MyResource {
@GET
public void longRunningOp(@Suspended final AsyncResponse ar) {
executor.submit(
new Runnable() {
public void run() {
executeLongRunningOp();
ar.resume("Hello async world!");
} });
}
...
}
This is my client code:
// Response
Response response = clientWithAsync.get();
System.out.println("\nResponse received.");
String stringWithAsync = response.readEntity(String.class);
System.out.println("Entity: " + stringWithAsync + "\n");
When I try to use a cxf client to get the response normally, I got this error:
<html><head><title>Apache Tomcat/7.0.27 - Error report</title><style><!--H1 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:22px;} H2
{font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:16px;} H3 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:14px;} BODY {font-family:Tahoma,Arial,sans-serif;color:black;background-color:white;} B
{font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;} P {font-family:Tahoma,Arial,sans-serif;background:white;color:black;font-size:12px;}A {color : black;}A.name {color : black;}HR {color : #525D76;}--></style> </head><body><h1>HTTP Status
500 - </h1><HR size="1" noshade="noshade"><p><b>type</b> Exception report</p><p><b>message</b> <u></u></p><p><b>description</b> <u>The server encountered an internal error ()
that prevented it from fulfilling this request.</u></p><p><b>exception</b> <pre>java.lang.RuntimeException: org.apache.c
x
f.interceptor.Fault
org.apache.cxf.interceptor.AbstractFaultChainInitiatorObserver.onMessage(AbstractFaultChainInitiatorObserver.java:116)
org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:331)
org.apache.cxf.transport.ChainInitiationObserver.onMessage(ChainInitiationObserver.java:121)
org.apache.cxf.transport.http.AbstractHTTPDestination.invoke(AbstractHTTPDestination.java:239)
org.apache.cxf.transport.servlet.ServletController.invokeDestination(ServletController.java:223)
org.apache.cxf.transport.servlet.ServletController.invoke(ServletController.java:203)
org.apache.cxf.transport.servlet.ServletController.invoke(ServletController.java:137)
org.apache.cxf.transport.servlet.CXFNonSpringServlet.invoke(CXFNonSpringServlet.java:158)
org.apache.cxf.transport.servlet.AbstractHTTPServlet.handleRequest(AbstractHTTPServlet.java:243)
org.apache.cxf.transport.servlet.AbstractHTTPServlet.doGet(AbstractHTTPServlet.java:168)
javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
org.apache.cxf.transport.servlet.AbstractHTTPServlet.service(AbstractHTTPServlet.java:219)
</pre></p><p><b>root cause</b> <pre>org.apache.cxf.interceptor.Fault
org.apache.cxf.interceptor.AbstractFaultChainInitiatorObserver.onMessage(AbstractFaultChainInitiatorObserver.java:76)
org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:331)
org.apache.cxf.transport.ChainInitiationObserver.onMessage(ChainInitiationObserver.java:121)
org.apache.cxf.transport.http.AbstractHTTPDestination.invoke(AbstractHTTPDestination.java:239)
org.apache.cxf.transport.servlet.ServletController.invokeDestination(ServletController.java:223)
org.apache.cxf.transport.servlet.ServletController.invoke(ServletController.java:203)
org.apache.cxf.transport.servlet.ServletController.invoke(ServletController.java:137)
org.apache.cxf.transport.servlet.CXFNonSpringServlet.invoke(CXFNonSpringServlet.java:158)
org.apache.cxf.transport.servlet.AbstractHTTPServlet.handleRequest(AbstractHTTPServlet.java:243)
org.apache.cxf.transport.servlet.AbstractHTTPServlet.doGet(AbstractHTTPServlet.java:168)
javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
org.apache.cxf.transport.servlet.AbstractHTTPServlet.service(AbstractHTTPServlet.java:219)
</pre></p><p><b>root cause</b> <pre>java.lang.NullPointerException
org.apache.cxf.jaxrs.impl.AsyncResponseImpl.initContinuation(AsyncResponseImpl.java:240)
org.apache.cxf.jaxrs.impl.AsyncResponseImpl.<init>(AsyncResponseImpl.java:58)
org.apache.cxf.jaxrs.utils.JAXRSUtils.processParameter(JAXRSUtils.java:773)
org.apache.cxf.jaxrs.utils.JAXRSUtils.processParameters(JAXRSUtils.java:747)
org.apache.cxf.jaxrs.interceptor.JAXRSInInterceptor.processRequest(JAXRSInInterceptor.java:240)
org.apache.cxf.jaxrs.interceptor.JAXRSInInterceptor.handleMessage(JAXRSInInterceptor.java:100)
org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:271)
org.apache.cxf.transport.ChainInitiationObserver.onMessage(ChainInitiationObserver.java:121)
org.apache.cxf.transport.http.AbstractHTTPDestination.invoke(AbstractHTTPDestination.java:239)
org.apache.cxf.transport.servlet.ServletController.invokeDestination(ServletController.java:223)
org.apache.cxf.transport.servlet.ServletController.invoke(ServletController.java:203)
org.apache.cxf.transport.servlet.ServletController.invoke(ServletController.java:137)
org.apache.cxf.transport.servlet.CXFNonSpringServlet.invoke(CXFNonSpringServlet.java:158)
org.apache.cxf.transport.servlet.AbstractHTTPServlet.handleRequest(AbstractHTTPServlet.java:243)
org.apache.cxf.transport.servlet.AbstractHTTPServlet.doGet(AbstractHTTPServlet.java:168)
javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
org.apache.cxf.transport.servlet.AbstractHTTPServlet.service(AbstractHTTPServlet.java:219)
</pre></p><p><b>note</b> <u>The full stack trace of the root cause is available in the Apache Tomcat/7.0.27 logs.</u></p><HR
size="1" noshade="noshade"><h3>Apache Tomcat/7.0.27</h3></body></html>
I am not sure what the problem is. Is there anything wrong with my client? Or
I can't use asynchronous api in server like this? Can I use a synchronous
client or I need to use an asynchronous client? Could you please give me some
advice?
Thank you very much!
Sincerely,
Di Ma
