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https://issues.apache.org/jira/browse/BROOKLYN-120?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Duncan Godwin resolved BROOKLYN-120.
------------------------------------
Resolution: Fixed
> Warning in REST server: "JsonGenerationException: Null key for a Map" in
> HighAvailabilitySummary
> ------------------------------------------------------------------------------------------------
>
> Key: BROOKLYN-120
> URL: https://issues.apache.org/jira/browse/BROOKLYN-120
> Project: Brooklyn
> Issue Type: Bug
> Reporter: Aled Sage
> Priority: Minor
>
> After running a live-test that involved rebinding the brooklyn server, I saw
> this in the log file (but I can't reproduce it):
> {noformat}
> 2015-01-15 23:09:14,846 WARN b.r.u.j.ErrorAndToStringUnknownTypeSerializer
> [brooklyn-jetty-server-8082-qtp281110571-4750]: Standard serialization not
> possible for class brooklyn.rest.domain.HighAvailabilitySummary
> (HighAvailabilitySummary{ownId='EiPdKNAc',
> links={}})
> org.codehaus.jackson.JsonGenerationException: Null key for a Map not allowed
> in JSON (use a converting NullKeySerializer?)
> at
> org.codehaus.jackson.map.ser.impl.FailingSerializer.serialize(FailingSerializer.java:34)
> ~[jackson-mapper-asl-1.9.13.jar:1.9.13]
> at
> org.codehaus.jackson.map.ser.std.MapSerializer.serializeFields(MapSerializer.java:237)
> ~[jackson-mapper-asl-1.9.13.jar:1.9.13]
> at
> org.codehaus.jackson.map.ser.std.MapSerializer.serialize(MapSerializer.java:186)
> ~[jackson-mapper-asl-1.9.13.jar:1.9.13]
> at
> org.codehaus.jackson.map.ser.std.MapSerializer.serialize(MapSerializer.java:23)
> ~[jackson-mapper-asl-1.9.13.jar:1.9.13]
> at
> org.codehaus.jackson.map.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:446)
> ~[jackson-mapper-asl-1.9.13.jar:1.9.13]
> at
> org.codehaus.jackson.map.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:150)
> ~[jackson-mapper-asl-1.9.13.jar:1.9.13]
> at
> org.codehaus.jackson.map.ser.BeanSerializer.serialize(BeanSerializer.java:112)
> ~[jackson-mapper-asl-1.9.13.jar:1.9.13]
> at
> org.codehaus.jackson.map.ser.StdSerializerProvider._serializeValue(StdSerializerProvider.java:610)
> [jackson-mapper-asl-1.9.13.jar:1.9.13]
> at
> brooklyn.rest.util.json.ConfigurableSerializerProvider._serializeValue(ConfigurableSerializerProvider.java:68)
> ~[brooklyn-rest-server-0.7.0-SNAPSHOT.jar:0.7.0-SNAPSHOT]
> at
> org.codehaus.jackson.map.ser.StdSerializerProvider.serializeValue(StdSerializerProvider.java:256)
> [jackson-mapper-asl-1.9.13.jar:1.9.13]
> at
> org.codehaus.jackson.map.ObjectMapper.writeValue(ObjectMapper.java:1613)
> [jackson-mapper-asl-1.9.13.jar:1.9.13]
> at
> org.codehaus.jackson.jaxrs.JacksonJsonProvider.writeTo(JacksonJsonProvider.java:559)
> [jackson-jaxrs-1.9.13.jar:1.9.13]
> at
> com.sun.jersey.spi.container.ContainerResponse.write(ContainerResponse.java:302)
> [jersey-server-1.18.1.jar:1.18.1]
> at
> com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1510)
> [jersey-server-1.18.1.jar:1.18.1]
> at
> com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1419)
> [jersey-server-1.18.1.jar:1.18.1]
> at
> com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1409)
> [jersey-server-1.18.1.jar:1.18.1]
> at
> com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:409)
> [jersey-servlet-1.18.1.jar:1.18.1]
> at
> com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:540)
> [jersey-servlet-1.18.1.jar:1.18.1]
> at
> com.sun.jersey.spi.container.servlet.ServletContainer.doFilter(ServletContainer.java:909)
> [jersey-servlet-1.18.1.jar:1.18.1]
> at
> com.sun.jersey.spi.container.servlet.ServletContainer.doFilter(ServletContainer.java:857)
> [jersey-servlet-1.18.1.jar:1.18.1]
> at
> com.sun.jersey.spi.container.servlet.ServletContainer.doFilter(ServletContainer.java:811)
> [jersey-servlet-1.18.1.jar:1.18.1]
> at
> org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1338)
> [jetty-servlet-8.1.4.v20120524.jar:8.1.4.v20120524]
> at
> brooklyn.rest.filter.HaMasterCheckFilter.doFilter(HaMasterCheckFilter.java:64)
> [brooklyn-rest-server-0.7.0-SNAPSHOT.jar:0.7.0-SNAPSHOT]
> at
> org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1338)
> [jetty-servlet-8.1.4.v20120524.jar:8.1.4.v20120524]
> at brooklyn.rest.filter.LoggingFilter.doFilter(LoggingFilter.java:88)
> [brooklyn-rest-server-0.7.0-SNAPSHOT.jar:0.7.0-SNAPSHOT]
> at
> org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1338)
> [jetty-servlet-8.1.4.v20120524.jar:8.1.4.v20120524]
> at
> brooklyn.rest.filter.BrooklynPropertiesSecurityFilter.doFilter(BrooklynPropertiesSecurityFilter.java:122)
> [brooklyn-rest-server-0.7.0-SNAPSHOT.jar:0.7.0-SNAPSHOT]
> at
> org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1338)
> [jetty-servlet-8.1.4.v20120524.jar:8.1.4.v20120524]
> at
> brooklyn.rest.filter.RequestTaggingFilter.doFilter(RequestTaggingFilter.java:48)
> [brooklyn-rest-server-0.7.0-SNAPSHOT.jar:0.7.0-SNAPSHOT]
> at
> org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1338)
> [jetty-servlet-8.1.4.v20120524.jar:8.1.4.v20120524]
> at
> org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:484)
> [jetty-servlet-8.1.4.v20120524.jar:8.1.4.v20120524]
> at
> org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:119)
> [jetty-server-8.1.4.v20120524.jar:8.1.4.v20120524]
> at
> org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:524)
> [jetty-security-8.1.4.v20120524.jar:8.1.4.v20120524]
> at
> org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
> [jetty-server-8.1.4.v20120524.jar:8.1.4.v20120524]
> at
> org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1065)
> [jetty-server-8.1.4.v20120524.jar:8.1.4.v20120524]
> at
> org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:413)
> [jetty-servlet-8.1.4.v20120524.jar:8.1.4.v20120524]
> at
> org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:192)
> [jetty-server-8.1.4.v20120524.jar:8.1.4.v20120524]
> at
> org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:999)
> [jetty-server-8.1.4.v20120524.jar:8.1.4.v20120524]
> at
> org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:117)
> [jetty-server-8.1.4.v20120524.jar:8.1.4.v20120524]
> at
> org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:250)
> [jetty-server-8.1.4.v20120524.jar:8.1.4.v20120524]
> at
> org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:111)
> [jetty-server-8.1.4.v20120524.jar:8.1.4.v20120524]
> at org.eclipse.jetty.server.Server.handle(Server.java:350)
> [jetty-server-8.1.4.v20120524.jar:8.1.4.v20120524]
> at
> org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:454)
> [jetty-server-8.1.4.v20120524.jar:8.1.4.v20120524]
> at
> org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:890)
> [jetty-server-8.1.4.v20120524.jar:8.1.4.v20120524]
> at
> org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:944)
> [jetty-server-8.1.4.v20120524.jar:8.1.4.v20120524]
> at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:630)
> [jetty-http-8.1.4.v20120524.jar:8.1.4.v20120524]
> at
> org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:230)
> [jetty-http-8.1.4.v20120524.jar:8.1.4.v20120524]
> at
> org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:77)
> [jetty-server-8.1.4.v20120524.jar:8.1.4.v20120524]
> at
> org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:620)
> [jetty-io-8.1.4.v20120524.jar:8.1.4.v20120524]
> at
> org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:46)
> [jetty-io-8.1.4.v20120524.jar:8.1.4.v20120524]
> at
> org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:603)
> [jetty-util-8.1.4.v20120524.jar:8.1.4.v20120524]
> at
> org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:538)
> [jetty-util-8.1.4.v20120524.jar:8.1.4.v20120524]
> at java.lang.Thread.run(Thread.java:745) [na:1.8.0_25]
> {noformat}
> It suggests to me a couple of problems:
> 1. that `HighAvailabilitySummary` is being created with a null key in its
> nodes map (I presume?).
> 2. that we need to guard against this when creating the
> `HighAvailabilitySummary` object.
> I wonder if (1) is just transient - that we polled while the server was still
> coming up. It happened within 2 seconds of us seeing the log for "Rebind
> complete (MASTER)", and the log for "Started Brooklyn console at
> http://Aleds-MacBook-Pro.local:8082/";.
> For (2), I am presuming it is `HighAvailabilitySummary.nodes` because the log
> warning says its about that class, and the exception says it's a "Null key
> for a Map". In that class, the only field of type map that could have a null
> value is `nodes`.
> The call was just being done by the web-console, so no harm done. If it had
> happened for a customer's REST client then the consequences would have been
> worse.
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