Hello, I am using Curator's curator-x-discovery-sever and trying to set it up with Jersey and Tomcat.
I created my resource class, injected the class. Also injected those singletons mentioned. (following this page http://curator.incubator.apache.org/curator-x-discovery-server/index.html ) However, I am getting NPE when the contextResolver tries to getContext. The ContextResolver singleton is injected, and it looks like the @Context injection isn't happening. Can someone please help me to see what is wrong with my code? Thanks. Here is my code, the highlighted line is where the exception happens: Resource @Path("compass") public class CompassResource extends DiscoveryResource<ServicePayload> { public CompassResource(@Context ContextResolver<DiscoveryContext<ServicePayload>> resolver) { super(resolver.getContext(DiscoveryContext.class)); } } Application public class DiscoveryServerApplication extends Application { @Override public Set<Class<?>> getClasses() { Set<Class<?>> s = new HashSet<Class<?>>(); //s.add(MyResource.class); s.add(CompassResource.class); return s; } @Override public Set<Object> getSingletons() { final Set<Object> singletons = Sets.newHashSet(); // inject ServiceDiscovery singleton CuratorFrameworkFactory.Builder builder = CuratorFrameworkFactory.builder() .connectString("localhost:2181").sessionTimeoutMs(300000).connectionTimeoutMs(30000) .retryPolicy(new ExponentialBackoffRetry(1000,3)); CuratorFramework client = builder.build(); client.start(); ServiceDiscovery<ServicePayload> serviceDiscovery = ServiceDiscoveryBuilder.builder(ServicePayload.class) .client(client).basePath("/").build(); singletons.add(serviceDiscovery); // inject DiscoveryContext singleton GenericDiscoveryContext<ServicePayload> discoveryContext = new GenericDiscoveryContext<ServicePayload> (serviceDiscovery, new RandomStrategy<ServicePayload>(), 500, ServicePayload.class); singletons.add(discoveryContext); // inject JsonServiceInstanceMarshaller singleton singletons.add(new JsonServiceInstanceMarshaller(discoveryContext)); // inject JsonServiceInstancesMarshaller singleton singletons.add(new JsonServiceInstancesMarshaller(discoveryContext)); // inject JsonServiceNamesMarshaller singletons.add(new JsonServiceNamesMarshaller()); return singletons; } } web.xml <servlet> <servlet-name>Curator Discovery Server</servlet-name> <servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class> <init-param> <param-name>javax.ws.rs.Application</param-name> <param-value>com.lb.eqr.discovery.server.DiscoveryServerApplication</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>Curator Discovery Server</servlet-name> <url-pattern>/*</url-pattern> </servlet-mapping> =========== Here is the exception: root cause java.lang.NullPointerException com.lb.eqr.discovery.server.CompassResource.<init>(CompassResource.java:23) sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39) sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) java.lang.reflect.Constructor.newInstance(Constructor.java:513) org.glassfish.hk2.utilities.reflection.ReflectionHelper.makeMe(ReflectionHelper.java:1091) org.jvnet.hk2.internal.ClazzCreator.createMe(ClazzCreator.java:244) org.jvnet.hk2.internal.ClazzCreator.create(ClazzCreator.java:319) org.jvnet.hk2.internal.SystemDescriptor.create(SystemDescriptor.java:448) org.glassfish.jersey.process.internal.RequestScope.findOrCreate(RequestScope.java:157) org.jvnet.hk2.internal.Utilities.createService(Utilities.java:2203) org.jvnet.hk2.internal.ServiceLocatorImpl.getService(ServiceLocatorImpl.java:579) org.jvnet.hk2.internal.ServiceLocatorImpl.getService(ServiceLocatorImpl.java:566) org.glassfish.jersey.internal.inject.Injections.getOrCreate(Injections.java:172) org.glassfish.jersey.server.model.MethodHandler$ClassBasedMethodHandler.getInstance(MethodHandler.java:185) org.glassfish.jersey.server.internal.routing.PushMethodHandlerRouter.apply(PushMethodHandlerRouter.java:105) org.glassfish.jersey.server.internal.routing.RoutingStage._apply(RoutingStage.java:118) org.glassfish.jersey.server.internal.routing.RoutingStage._apply(RoutingStage.java:121) org.glassfish.jersey.server.internal.routing.RoutingStage._apply(RoutingStage.java:121) org.glassfish.jersey.server.internal.routing.RoutingStage._apply(RoutingStage.java:121) org.glassfish.jersey.server.internal.routing.RoutingStage._apply(RoutingStage.java:121) org.glassfish.jersey.server.internal.routing.RoutingStage.apply(RoutingStage.java:102) org.glassfish.jersey.server.internal.routing.RoutingStage.apply(RoutingStage.java:62) org.glassfish.jersey.process.internal.Stages.process(Stages.java:197) org.glassfish.jersey.server.ServerRuntime$1.run(ServerRuntime.java:215) org.glassfish.jersey.internal.Errors$1.call(Errors.java:271) org.glassfish.jersey.internal.Errors$1.call(Errors.java:267) org.glassfish.jersey.internal.Errors.process(Errors.java:315) org.glassfish.jersey.internal.Errors.process(Errors.java:297) org.glassfish.jersey.internal.Errors.process(Errors.java:267) org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:317) org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:198) org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:946) org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:323) org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:372) org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:335) org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:218) _______________________________________________ This message is for information purposes only, it is not a recommendation, advice, offer or solicitation to buy or sell a product or service nor an official confirmation of any transaction. 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