Error with EurekaServer in standalone mode.

[wgorder]

So I have this project I am trying to get working in a certain way and I keep running into stuff, so I have started a public repo that I can create a simpler example with, and maybe it will help others to as it evolves.

I was trying to get the standalone eureka server configuration working as outlined in the documentation and I get this exception below when I hit the dashboard. You can reproduce from here:

https://github.com/wgorder/service-discovery

serviceDiscovery_1 | [2014-12-08 10:33:50.931] boot - 1 ERROR [http-nio-8761-exec-1] --- StatusResource: Could not determine if the replica is available 
serviceDiscovery_1 | java.lang.NullPointerException
serviceDiscovery_1 |    at com.netflix.eureka.resources.StatusResource.isReplicaAvailable(StatusResource.java:90)
serviceDiscovery_1 |    at com.netflix.eureka.resources.StatusResource.getStatusInfo(StatusResource.java:70)
serviceDiscovery_1 |    at org.springframework.cloud.netflix.eureka.server.EurekaController.status(EurekaController.java:40)
serviceDiscovery_1 |    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
serviceDiscovery_1 |    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
serviceDiscovery_1 |    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
serviceDiscovery_1 |    at java.lang.reflect.Method.invoke(Method.java:483)
serviceDiscovery_1 |    at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221)
serviceDiscovery_1 |    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137)
serviceDiscovery_1 |    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110)
serviceDiscovery_1 |    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:777)
serviceDiscovery_1 |    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:706)
serviceDiscovery_1 |    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
serviceDiscovery_1 |    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:943)
serviceDiscovery_1 |    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877)
serviceDiscovery_1 |    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966)
serviceDiscovery_1 |    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:857)
serviceDiscovery_1 |    at javax.servlet.http.HttpServlet.service(HttpServlet.java:618)
serviceDiscovery_1 |    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
serviceDiscovery_1 |    at javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
serviceDiscovery_1 |    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)
serviceDiscovery_1 |    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
serviceDiscovery_1 |    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
serviceDiscovery_1 |    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
serviceDiscovery_1 |    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
serviceDiscovery_1 |    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
serviceDiscovery_1 |    at org.springframework.boot.actuate.autoconfigure.EndpointWebMvcAutoConfiguration$ApplicationContextHeaderFilter.doFilterInternal(EndpointWebMvcAutoConfiguration.java:288)
serviceDiscovery_1 |    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
serviceDiscovery_1 |    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
serviceDiscovery_1 |    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
serviceDiscovery_1 |    at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77)
serviceDiscovery_1 |    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
serviceDiscovery_1 |    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
serviceDiscovery_1 |    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
serviceDiscovery_1 |    at org.springframework.boot.actuate.trace.WebRequestTraceFilter.doFilterInternal(WebRequestTraceFilter.java:100)
serviceDiscovery_1 |    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
serviceDiscovery_1 |    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
serviceDiscovery_1 |    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
serviceDiscovery_1 |    at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:186)
serviceDiscovery_1 |    at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:160)
serviceDiscovery_1 |    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
serviceDiscovery_1 |    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
serviceDiscovery_1 |    at org.springframework.boot.actuate.autoconfigure.MetricFilterAutoConfiguration$MetricsFilter.doFilterInternal(MetricFilterAutoConfiguration.java:90)
serviceDiscovery_1 |    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
serviceDiscovery_1 |    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
serviceDiscovery_1 |    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
serviceDiscovery_1 |    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
serviceDiscovery_1 |    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
serviceDiscovery_1 |    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
serviceDiscovery_1 |    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142)
serviceDiscovery_1 |    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
serviceDiscovery_1 |    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
serviceDiscovery_1 |    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:537)
serviceDiscovery_1 |    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1085)
serviceDiscovery_1 |    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:658)
serviceDiscovery_1 |    at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:222)
serviceDiscovery_1 |    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1556)
serviceDiscovery_1 |    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1513)
serviceDiscovery_1 |    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
serviceDiscovery_1 |    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
serviceDiscovery_1 |    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
serviceDiscovery_1 |    at java.lang.Thread.run(Thread.java:745)

[dsyer]

As far as I know that's harmless. I think it's just a sign that the Eureka client part of the server hasn't started up properly yet (it takes a while). Unfortunately the error is logged by third party code (Netflix) so it's not possible to suppress it without just switching off logging for that channel (which is what I usually do).

[wgorder]

Thanks Dave. One other quick Eureka related question if I could. I noticed that the client connects but it shows as registered but unavailable rather than available. Is that normal?

[dsyer]

Which client?

[wgorder]

Well I have a UI piece that registers itself with the server. When you go to the Eureka server dashboard you see that it is unavailable.

[wgorder]

meh I guess its the replica that is unavailable. That is probably just because I am running stand-alone.

[dsyer]

Yes. It all looks normal to me. And the original error you posted goes away if you wait a bit?

[wgorder]

Seems to have thanks! Next step SSO :)

[shuraa]

@dsyer why this exception is normal? I think there is bug in implementation of isReplicaAvailable

    private boolean isReplicaAvailable(String myAppName, String url) {

        try {
            String givenHostName = new URI(url).getHost();
            Application app = PeerAwareInstanceRegistry.getInstance()
            .getApplication(myAppName, false);
            for (InstanceInfo info : app.getInstances()) {
                if (info.getHostName().equals(givenHostName)) {
                    return true;
                }
            }
            givenHostName = new URI(url).getHost();
        } catch (Throwable e) {
            logger.error("Could not determine if the replica is available ", e);
        }
        return false;
    }

since app can be null by contract of PeerAwareInstanceRegistry.getApplication(...), so if there is no app instance - no replica is available for now and isReplicaAvailable have to return false without any exception in log.

[dsyer]

I guess I agree. But that code is in com.netflix.eureka.util.StatusUtil, so please raise an issue and try and get it fixed in Eureka (I already pointed this out in a comment above).

[shuraa]

@dsyer, ok

[shuraa]

Its seems that issue has been already fixed in https://github.com/Netflix/eureka/releases/tag/v1.3.0

[dsyer]

Should be fixed in Spring Cloud Netflix 1.1 then (unless they had a regression).