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:

Description Resource Path Location Type Column "id" cannot be resolved on table "page" Page.java /BreakpointJPA/src/no/breakpoint/domain line 14 JPA Problem

Description Resource Path Location Type Column "title" cannot be resolved on table "page" Page.java /BreakpointJPA/src/no/breakpoint/domain line 18 JPA Problem

Description Resource Path Location Type Primary key join column "id" cannot be resolved on table "page" Page.java /BreakpointJPA/src/no/breakpoint/domain line 10 JPA Problem

Answer 1

I've had the same problem, the solution for me was to refresh the database connection.

Open the JPA view, find the data source explorer. There you open Database Connection, connect with your database, hit refresh. Then make some changes in your file and save it, i added an @Column(name = "") annotation to my id field. After that the error message was gone, and i ereased the Column annotation.

The Problem seems to be that eclipse reads the database tables after establishing the first connection, after that the connection is closed. So if you, like i did, made some changes after this first connection in your database, like changing the field name from foo_id to just id, eclipse didn't know that and comes with this error.