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

    https://github.com/apache/nifi-minifi/pull/50#discussion_r86619586
  
    --- Diff: 
minifi-commons/minifi-commons-schema/src/main/java/org/apache/nifi/minifi/commons/schema/ConnectionSchema.java
 ---
    @@ -50,21 +49,18 @@
         private String queuePrioritizerClass;
     
         public ConnectionSchema(Map map) {
    -        super(map, CONNECTIONS_KEY);
    +        super(map, "Connection(id: {id}, name: {name})");
     
    +        String wrapperName = getWrapperName();
             // In case of older version, these may not be available until 
after construction, validated in getValidationIssues()
    -        sourceId = getOptionalKeyAsType(map, SOURCE_ID_KEY, String.class, 
CONNECTIONS_KEY, "");
    -        destinationId = getOptionalKeyAsType(map, DESTINATION_ID_KEY, 
String.class, CONNECTIONS_KEY, "");
    -
    -        sourceRelationshipNames = getOptionalKeyAsType(map, 
SOURCE_RELATIONSHIP_NAMES_KEY, List.class, CONNECTIONS_KEY, new ArrayList<>());
    -        if (sourceRelationshipNames.isEmpty()) {
    -            addValidationIssue("Expected at least one value in " + 
SOURCE_RELATIONSHIP_NAMES_KEY + " for " + CONNECTIONS_KEY + " " + getName());
    -        }
    -
    -        maxWorkQueueSize = getOptionalKeyAsType(map, 
MAX_WORK_QUEUE_SIZE_KEY, Number.class, CONNECTIONS_KEY, 
DEFAULT_MAX_WORK_QUEUE_SIZE);
    -        maxWorkQueueDataSize = getOptionalKeyAsType(map, 
MAX_WORK_QUEUE_DATA_SIZE_KEY, String.class, CONNECTIONS_KEY, 
DEFAULT_MAX_QUEUE_DATA_SIZE);
    -        flowfileExpiration = getOptionalKeyAsType(map, 
FLOWFILE_EXPIRATION__KEY, String.class, CONNECTIONS_KEY, 
DEFAULT_FLOWFILE_EXPIRATION);
    -        queuePrioritizerClass = getOptionalKeyAsType(map, 
QUEUE_PRIORITIZER_CLASS_KEY, String.class, CONNECTIONS_KEY, "");
    +        sourceId = getOptionalKeyAsType(map, SOURCE_ID_KEY, String.class, 
wrapperName, "");
    +        destinationId = getOptionalKeyAsType(map, DESTINATION_ID_KEY, 
String.class, wrapperName, "");
    +
    +        sourceRelationshipNames = getOptionalKeyAsType(map, 
SOURCE_RELATIONSHIP_NAMES_KEY, List.class, wrapperName, new ArrayList<>());
    --- End diff --
    
    Could you add a comment explaining that this could be empty if the source 
is a port?


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