Nest on OH2: Cannot trigger scan for thing types

Add-ons Bindings
1

Hello,

I am migrating from the Nest 1 binding to the Nest 2 binding. I’ve setup the Nest Account Thing, it shows online, and shows an access token has been populated. I cannot add Things however. Each scan results in this single error in the log:

2017-09-07 16:04:32.000 [ERROR] [nternal.DiscoveryServiceRegistryImpl] - Cannot trigger scan for thing types '[nest:structure, nest:camera, nest:thermostat, nest:smoke_detector]' on 'NestDiscoveryService'!
java.lang.NullPointerException: null
        at org.openhab.binding.nest.handler.NestBridgeHandler.compareThings(NestBridgeHandler.java:202) [232:org.openhab.binding.nest:2.2.0.201709071552]
        at org.openhab.binding.nest.handler.NestBridgeHandler.refreshData(NestBridgeHandler.java:178) [232:org.openhab.binding.nest:2.2.0.201709071552]
        at org.openhab.binding.nest.handler.NestBridgeHandler.startDiscoveryScan(NestBridgeHandler.java:339) [232:org.openhab.binding.nest:2.2.0.201709071552]
        at org.openhab.binding.nest.discovery.NestDiscoveryService.startScan(NestDiscoveryService.java:61) [232:org.openhab.binding.nest:2.2.0.201709071552]
        at org.eclipse.smarthome.config.discovery.AbstractDiscoveryService.startScan(AbstractDiscoveryService.java:200) [96:org.eclipse.smarthome.config.discovery:0.9.0.201709011622]
        at org.eclipse.smarthome.config.discovery.internal.DiscoveryServiceRegistryImpl.startScan(DiscoveryServiceRegistryImpl.java:399) [96:org.eclipse.smarthome.config.discovery:0.9.0.201709011622]
        at org.eclipse.smarthome.config.discovery.internal.DiscoveryServiceRegistryImpl.startScans(DiscoveryServiceRegistryImpl.java:384) [96:org.eclipse.smarthome.config.discovery:0.9.0.201709011622]
        at org.eclipse.smarthome.config.discovery.internal.DiscoveryServiceRegistryImpl.startScan(DiscoveryServiceRegistryImpl.java:228) [96:org.eclipse.smarthome.config.discovery:0.9.0.201709011622]
        at org.eclipse.smarthome.io.rest.core.discovery.DiscoveryResource.scan(DiscoveryResource.java:86) [116:org.eclipse.smarthome.io.rest.core:0.9.0.201709011622]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?]
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:?]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?]
        at java.lang.reflect.Method.invoke(Method.java:498) ~[?:?]
        at org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory$1.invoke(ResourceMethodInvocationHandlerFactory.java:81) [158:org.glassfish.jersey.core.jersey-server:2.22.2]
        at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher$1.run(AbstractJavaResourceMethodDispatcher.java:144) [158:org.glassfish.jersey.core.jersey-server:2.22.2]
        at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:161) [158:org.glassfish.jersey.core.jersey-server:2.22.2]
        at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$ResponseOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:160) [158:org.glassfish.jersey.core.jersey-server:2.22.2]
        at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:99) [158:org.glassfish.jersey.core.jersey-server:2.22.2]
        at org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:389) [158:org.glassfish.jersey.core.jersey-server:2.22.2]
        at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:347) [158:org.glassfish.jersey.core.jersey-server:2.22.2]
        at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:102) [158:org.glassfish.jersey.core.jersey-server:2.22.2]
        at org.glassfish.jersey.server.ServerRuntime$2.run(ServerRuntime.java:326) [158:org.glassfish.jersey.core.jersey-server:2.22.2]
        at org.glassfish.jersey.internal.Errors$1.call(Errors.java:271) [157:org.glassfish.jersey.core.jersey-common:2.22.2]
        at org.glassfish.jersey.internal.Errors$1.call(Errors.java:267) [157:org.glassfish.jersey.core.jersey-common:2.22.2]
        at org.glassfish.jersey.internal.Errors.process(Errors.java:315) [157:org.glassfish.jersey.core.jersey-common:2.22.2]
        at org.glassfish.jersey.internal.Errors.process(Errors.java:297) [157:org.glassfish.jersey.core.jersey-common:2.22.2]
        at org.glassfish.jersey.internal.Errors.process(Errors.java:267) [157:org.glassfish.jersey.core.jersey-common:2.22.2]
        at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:317) [157:org.glassfish.jersey.core.jersey-common:2.22.2]
        at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:305) [158:org.glassfish.jersey.core.jersey-server:2.22.2]
        at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:1154) [158:org.glassfish.jersey.core.jersey-server:2.22.2]
        at org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:473) [155:org.glassfish.jersey.containers.jersey-container-servlet-core:2.22.2]
        at org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:427) [155:org.glassfish.jersey.containers.jersey-container-servlet-core:2.22.2]
        at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:388) [155:org.glassfish.jersey.containers.jersey-container-servlet-core:2.22.2]
        at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:341) [155:org.glassfish.jersey.containers.jersey-container-servlet-core:2.22.2]
        at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:228) [155:org.glassfish.jersey.containers.jersey-container-servlet-core:2.22.2]
        at com.eclipsesource.jaxrs.publisher.internal.ServletContainerBridge.service(ServletContainerBridge.java:76) [16:com.eclipsesource.jaxrs.publisher:5.3.1.201602281253]
        at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:845) [86:org.eclipse.jetty.servlet:9.3.14.v20161028]
        at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:584) [86:org.eclipse.jetty.servlet:9.3.14.v20161028]
        at org.ops4j.pax.web.service.jetty.internal.HttpServiceServletHandler.doHandle(HttpServiceServletHandler.java:71) [171:org.ops4j.pax.web.pax-web-jetty:6.0.6]
        at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143) [85:org.eclipse.jetty.server:9.3.14.v20161028]
        at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548) [83:org.eclipse.jetty.security:9.3.14.v20161028]
        at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:226) [85:org.eclipse.jetty.server:9.3.14.v20161028]
        at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1180) [85:org.eclipse.jetty.server:9.3.14.v20161028]
        at org.ops4j.pax.web.service.jetty.internal.HttpServiceContext.doHandle(HttpServiceContext.java:284) [171:org.ops4j.pax.web.pax-web-jetty:6.0.6]
        at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:512) [86:org.eclipse.jetty.servlet:9.3.14.v20161028]
        at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185) [85:org.eclipse.jetty.server:9.3.14.v20161028]
        at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1112) [85:org.eclipse.jetty.server:9.3.14.v20161028]
        at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141) [85:org.eclipse.jetty.server:9.3.14.v20161028]
        at org.ops4j.pax.web.service.jetty.internal.JettyServerHandlerCollection.handle(JettyServerHandlerCollection.java:80) [171:org.ops4j.pax.web.pax-web-jetty:6.0.6]
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134) [85:org.eclipse.jetty.server:9.3.14.v20161028]
        at org.eclipse.jetty.server.Server.handle(Server.java:534) [85:org.eclipse.jetty.server:9.3.14.v20161028]
        at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:320) [85:org.eclipse.jetty.server:9.3.14.v20161028]
        at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:251) [85:org.eclipse.jetty.server:9.3.14.v20161028]
        at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:273) [77:org.eclipse.jetty.io:9.3.14.v20161028]
        at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:95) [77:org.eclipse.jetty.io:9.3.14.v20161028]
        at org.eclipse.jetty.io.SelectChannelEndPoint$2.run(SelectChannelEndPoint.java:93) [77:org.eclipse.jetty.io:9.3.14.v20161028]
        at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.executeProduceConsume(ExecuteProduceConsume.java:303) [88:org.eclipse.jetty.util:9.3.14.v20161028]
        at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.produceConsume(ExecuteProduceConsume.java:148) [88:org.eclipse.jetty.util:9.3.14.v20161028]
        at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.run(ExecuteProduceConsume.java:136) [88:org.eclipse.jetty.util:9.3.14.v20161028]
        at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:671) [88:org.eclipse.jetty.util:9.3.14.v20161028]
        at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:589) [88:org.eclipse.jetty.util:9.3.14.v20161028]
        at java.lang.Thread.run(Thread.java:745) [?:?]

Any thoughts on what is causing it to fail to scan?

2

Hi.

I had the same problem earlier today, the only difference was, that the NPE was thrown by the homnematic-bidcos binding.

Right beforehand I noticed some java error messages stating to many open files.

Following up this thread I did as described in the bottommost posting: https://github.com/openhab/openhab-distro/issues/445

I’m running latest openHABian on an RPi3.

Maybe this will help you, too.

4

Thank you! Just for everyone’s awareness, this seemed to fix itself as I upgraded snapshot builds. I am on OH2.2 b1044 and it’s working fine now.

5

It looks like your exception got fixed with this bugfix.

We did some more rework on the Nest OH2.2 binding since b1044. So you might want to upgrade to an even newer version. :wink: