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From ggevay <...@git.apache.org>
Subject [GitHub] flink pull request: [FLINK-3519] [core] Add warning about subclass...
Date Sat, 12 Mar 2016 13:42:27 GMT
Github user ggevay commented on the pull request:

    https://github.com/apache/flink/pull/1724#issuecomment-195743886
  
    > What kind of exception do you get?
    
    This is the code near TypeExtractor.java:1379, from where the exception is thrown:
    ```
    		// check for subclasses of Tuple
    		if (Tuple.class.isAssignableFrom(clazz)) {
    			if(clazz == Tuple0.class) {
    				return new TupleTypeInfo(Tuple0.class);
    			}
    			throw new InvalidTypesException("Type information extraction for tuples (except Tuple0)
cannot be done based on the class.");
    		}
    ```
    
    > Also, subclasses of tuples that do not have additional fields can need not be Pojos
(even though Tuples by themselves should actually meet the Pojo rules)
    
    OK, I've updated the comment.


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