ConnectionFieldTypeVisitor.ConnectionDataFetcher.adapt throws IndexOutOfBoundsException when container is empty

[jimador]

The ConnectionFieldTypeVisitor.ConnectionDataFetcher.adapt method throws an IndexOutOfBoundsException when the container parameter is empty (e.g. an empty Spring Data Window). adapter.getContent(emptyWindowObject) will return an empty collection which makes nodes and edges empty lists. When edges.get(0) is called, we get an exception thrown - IndexOutOfBoundsException: Index 0 out of bounds for length 0.

[manishtulsiani]

Hi @jimador, we had the same error in our project when returning an empty container. Turns out, in this case, if you return null instead of empty container, the ConnectionFieldTypeVisitor.ConnectionDataFetcher.adapt maps it to an empty connection as seen here