Kislay Verma created CURATOR-453:
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             Summary: 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


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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