cayenne/src/main/java/org/apache/cayenne/access/DataDomainQueryAction.java [613:625]:
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    public QueryEngine engineForDataMap(DataMap map) {
        if (map == null) {
            throw new NullPointerException("Null DataMap, can't determine DataNode.");
        }

        QueryEngine node = domain.lookupDataNode(map);

        if (node == null) {
            throw new CayenneRuntimeException("No DataNode exists for DataMap %s", map);
        }

        return node;
    }
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cayenne/src/main/java/org/apache/cayenne/access/DataDomainLegacyQueryAction.java [115:127]:
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    public QueryEngine engineForDataMap(DataMap map) {
        if (map == null) {
            throw new NullPointerException("Null DataMap, can't determine DataNode.");
        }

        QueryEngine node = domain.lookupDataNode(map);

        if (node == null) {
            throw new CayenneRuntimeException("No DataNode exists for DataMap %s", map);
        }

        return node;
    }
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