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

Can you try this:

@Id
@GeneratedValue(strategy=GenerationType.AUTO)
@Column(name = "id", unique=true, nullable=false)
private int id

Answer 2

In my case it was just old connection in Properties->JPA->Add connection. So refresh will not help. New connection for correct database will help when refresh will not.

Answer 3

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

Answer 4

Old thread, however I just had the same problem and solved with an even quicker approach.

1. Project Properties --> JPA
2. Change connection to . Hit apply.
3. Change connection to previous value. Hit apply.

Hope this helps someone.