JpaRepository findOne returns null

Asked Jul 25 '18 at 16:19

Active Jul 25 '18 at 18:48

Viewed 31 times

I'm using the below code to retrieve a file from db using Spring Boot JPA. But it's returning null value.

PS. There is no problem with DB connection. I can save values using the repository but problem occurs while retrieving value using ID.

Can anyone please give me a solution ?

@RequestMapping(value = "/fetch/{id}", method = RequestMethod.GET)
public List<Page> getData(@PathVariable String id) {
     try {
            FileDB file = fileRepository.findOne(Long.parseLong(id));
            Document doc = file.getDocument();
            List<Page> pages = doc.getPages();
            return pages;

        } catch (Exception e) {
            System.out.println(e.toString());
            List<Page> pages = new ArrayList<>();
            return pages;
        }
}

edited Jul 25 '18 at 18:48

asked Jul 25 '18 at 16:19

rabinmallick

1

Show the exception please if any – NiVeR Jul 25 '18 at 16:20
Show the class/interface of `fileRepository` – Lino Jul 25 '18 at 16:22
Getting Null pointer exception - java.lang.NullPointerException – rabinmallick Jul 25 '18 at 16:23
Here is my fileRepository interface - public interface FileRepository extends JpaRepository {} – rabinmallick Jul 25 '18 at 16:25
We need more detail, like on which line it happens – NiVeR Jul 25 '18 at 16:25
On line - FileDB file = fileRepository.findOne(Long.parseLong(id)); – rabinmallick Jul 25 '18 at 16:28
How is your fileRepository initialised – Lino Jul 25 '18 at 16:36
is maybe `id` null? – Lino Jul 25 '18 at 16:39
No. There are 8 items on the DB. – rabinmallick Jul 25 '18 at 16:44
Did you try `findById` instead of `findOne`? – Bennett Dams Jul 25 '18 at 16:45
@Autowired FileRepository fileRepository; here is the fileRepository initaition. Lino – rabinmallick Jul 25 '18 at 16:46
JpaRepository doen't have any findById method @Bennett – rabinmallick Jul 25 '18 at 16:52
Ok, I've found the problem. I've accidentally changed one variable type in the bean. That's why it was not getting anything from DB saved using previous bean. Thanks everyone. – rabinmallick Jul 25 '18 at 18:44

JpaRepository findOne returns null

0 Answers0