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