I built a simple webapp (WAR file, deploying to Tomcat) that depends on the
CXF 3.2.2 libraries + Weld 3.0.2. I don't believe CDI has anything to do
with my problem though.
I registered a feature/server customizer that can deal with the invoker
logic required, and provided a rest controller that simply invokes the
postman echo service
Feature/Extension:
@ApplicationScoped
public class MyAppFeature implements Feature,
JAXRSServerFactoryCustomizationExtension {
public boolean configure(FeatureContext featureContext) {
featureContext.register(JsrProvider.class);
featureContext.register(ReactorInvokerProvider.class);
return true;
}
@Override
public void customize(JAXRSServerFactoryBean jaxrsServerFactoryBean) {
ReactorInvoker invoker = new ReactorInvoker();
invoker.setUseStreamingSubscriberIfPossible(false);
jaxrsServerFactoryBean.setInvoker(invoker);
StreamingResponseProvider<JsonObject> streamProvider = new
StreamingResponseProvider<>();
streamProvider.setProduceMediaTypes(Collections.singletonList("application/json"));
jaxrsServerFactoryBean.setProvider(streamProvider);
jaxrsServerFactoryBean.getOutInterceptors().add(new
LoggingOutInterceptor());
}
}
RestController:
@RequestScoped
@Path("/")
public class RestController {
@GET
@Produces(MediaType.APPLICATION_JSON)
public void doGet(@Suspended AsyncResponse asyncResponse) {
ClientBuilder.newClient()
.register(MyAppFeature.class)
.target("https://postman-echo.com/get";)
.queryParam("arg1", "arg1")
.queryParam("arg2", "arg2")
.request(MediaType.APPLICATION_JSON_TYPE)
.rx(ReactorInvoker.class)
.get(JsonObject.class)
.subscribe(new
JsonStreamingAsyncSubscriber<>(asyncResponse));
}
}
When I attempt to invoke this endpoint, I see a NPE in the logs
04-Feb-2018 11:07:20.245 WARNING [http-nio-8080-exec-69]
org.apache.cxf.phase.PhaseInterceptorChain.doDefaultLogging Interceptor for
{http://rest.mycompany.com/}RestController has thrown exception, unwinding
now
java.lang.NullPointerException
at
org.apache.cxf.jaxrs.impl.AsyncResponseImpl.initContinuation(AsyncResponseImpl.java:306)
at
org.apache.cxf.jaxrs.impl.AsyncResponseImpl.<init>(AsyncResponseImpl.java:68)
at
org.apache.cxf.jaxrs.utils.JAXRSUtils.processParameter(JAXRSUtils.java:826)
at
org.apache.cxf.jaxrs.utils.JAXRSUtils.processParameters(JAXRSUtils.java:795)
at
org.apache.cxf.jaxrs.interceptor.JAXRSInInterceptor.processRequest(JAXRSInInterceptor.java:214)
at
org.apache.cxf.jaxrs.interceptor.JAXRSInInterceptor.handleMessage(JAXRSInInterceptor.java:78)
at
org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:308)
at
org.apache.cxf.transport.ChainInitiationObserver.onMessage(ChainInitiationObserver.java:121)
at
org.apache.cxf.transport.http.AbstractHTTPDestination.invoke(AbstractHTTPDestination.java:267)
at
org.apache.cxf.transport.servlet.ServletController.invokeDestination(ServletController.java:234)
at
org.apache.cxf.transport.servlet.ServletController.invoke(ServletController.java:208)
at
org.apache.cxf.transport.servlet.ServletController.invoke(ServletController.java:160)
at
org.apache.cxf.transport.servlet.CXFNonSpringServlet.invoke(CXFNonSpringServlet.java:191)
at
org.apache.cxf.transport.servlet.AbstractHTTPServlet.handleRequest(AbstractHTTPServlet.java:301)
at
org.apache.cxf.transport.servlet.AbstractHTTPServlet.doGet(AbstractHTTPServlet.java:225)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:635)
at
org.apache.cxf.transport.servlet.AbstractHTTPServlet.service(AbstractHTTPServlet.java:276)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:504)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
at
org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
at
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803)
at
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:790)
at
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1459)
at
org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
Is there anything else that needs to happen to register the invoker to
handle async responses?
John
