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Posted to dev@curator.apache.org by "Jordan Zimmerman (JIRA)" <ji...@apache.org> on 2018/02/13 18:29:00 UTC
[jira] [Commented] (CURATOR-453) NPE in ServiceCacheImpl.start()
because child.getData() returns null
[ 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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