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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