Eclipse reports error on my JPA project

Question

Each time I make a JPA project Eclipse reports that there are errors in my project but I do not understand why it does so. I added image and errors below:

Answer 1

I had the same problem. Here is how I solved it

1. refreshed the connection
   • Go to Data Source Explorer
   • Select connection and right click
   • select Refresh
2. Clean the project
   • Go t Project menu
   • select clean