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From "Jordan Zimmerman (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CURATOR-453) NPE in ServiceCacheImpl.start() because child.getData() returns null
Date Tue, 13 Feb 2018 18:29:00 GMT

    [ https://issues.apache.org/jira/browse/CURATOR-453?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16362840#comment-16362840
] 

Jordan Zimmerman commented on CURATOR-453:
------------------------------------------

The problem seems to be in your serializer. Are you using Curator's {{JsonInstanceSerializer}} or
a custom serializer? Can you post the code of your serializer?

> NPE in ServiceCacheImpl.start() because child.getData() returns null
> --------------------------------------------------------------------
>
>                 Key: CURATOR-453
>                 URL: https://issues.apache.org/jira/browse/CURATOR-453
>             Project: Apache Curator
>          Issue Type: Bug
>          Components: General
>    Affects Versions: 4.0.0
>            Reporter: Kislay Verma
>            Priority: Major
>
> This problem is in curator-discovery module where we get an NPE on ServiceProvider.start()
because child.getData() can be null while starting ServiceCacheImpl. This is similar to https://issues.apache.org/jira/browse/CURATOR-452 but
happens on adding null to map.
> *NPE Stacktrace*
> {{java.lang.NullPointerException at java.util.concurrent.ConcurrentHashMap.putVal(ConcurrentHashMap.java:1011)
~[?:1.8.0_112] at java.util.concurrent.ConcurrentHashMap.putIfAbsent(ConcurrentHashMap.java:1535)
~[?:1.8.0_112] at org.apache.curator.x.discovery.details.ServiceCacheImpl.addInstance(ServiceCacheImpl.java:196)
~[curator-x-discovery-4.0.0.jar:?] at org.apache.curator.x.discovery.details.ServiceCacheImpl.start(ServiceCacheImpl.java:96)
~[curator-x-discovery-4.0.0.jar:?] at org.apache.curator.x.discovery.details.ServiceProviderImpl.start(ServiceProviderImpl.java:75)
~[curator-x-discovery-4.0.0.jar:?]}}
>  
> *The code*
> {{client = CuratorFrameworkFactory.newClient("localhost:2181", new ExponentialBackoffRetry(1000,
3));}}
> {{client.start();}}
> {{serviceDiscovery = ServiceDiscoveryBuilder.builder(ServiceRecord.class).client(client).basePath("/discovery/services/").serializer(serializer).build();
serviceDiscovery.start();}}
> {{serviceProvider = serviceDiscovery.serviceProviderBuilder().serviceName(serviceName).build();}}
> {{serviceProvider.start();}}
>  
>  



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