I think a bit more information is desirable.
What kind datatypes are you using? (numerics, varchars, blobs etc).
can you do a java insert ?(persist an object without web interaction, just do em.persist(new Pojo(...))
what version of java are you using (5 or 6?)
The problem is on that line - in that file.
If you can describe the problem a bit more, I'll describe the solution a bit more. :)