node to traverse cannot be null (Hibernate SQL)

Question

I\'m performing a SQL query through hibernate, which looks like:

SELECT thi 
FROM track_history_items thi 
JOIN artists art 
  ON thi.artist_id = art.id 
WHERE t         


        

Answer 1

node to traverse cannot be null!

This is a generic Hibernate error message indicating a syntax problem in your query. As another example, forgetting to start a select clause with the word "SELECT" would yield the same error.

In this instance the syntax error is due to the on clause - HQL does not support them. Instead do a cross join like so:

FROM track_history_items thi, artists art 
WHERE thi.type = "TrackBroadcast" 
AND  thi.artist_id = art.id 
GROUP BY art.name 
ORDER thi.createdAt DESC