I am using hibernate to access data from multiple tables and I need that data to be used in a visualization that I use. The main aspect of the data is the time field in each of the tables which is needed by the visualization.

here is the problem.

I am not able to access data from multiple tables using HQL.

I tried a query like "from a,b"

It keeps giving me a class cast exception.

how can I access data from both tables simultaneously.

I can sequentially access data right now but I need to read data at the same time from about 10 tables.