Github user pvillard31 commented on a diff in the pull request:

    https://github.com/apache/nifi/pull/986#discussion_r79215167
  
    --- Diff: 
nifi-nar-bundles/nifi-standard-services/nifi-dbcp-service-bundle/nifi-dbcp-service/src/main/java/org/apache/nifi/dbcp/DBCPConnectionPool.java
 ---
    @@ -114,6 +114,17 @@
             .sensitive(false)
             .build();
     
    +    public static final PropertyDescriptor VALIDATION_QUERY = new 
PropertyDescriptor.Builder()
    +            .name("Validation query")
    +            .description("Validation query used to validate connections 
before returning them."
    +                + "When connection is invalid, it get's dropped and new 
valid connection will be returned."
    +                + "Note!! Using validation might have some performance 
penalty.")
    +            .defaultValue(null)
    --- End diff --
    
    I don't think default value to null is necessary.


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