This kernel requires an x86-64 CPU, but only detected an i686 CPU

virtualbox 64-bit headless

4,821

Found an answer!

All of the options were on. However the "trusted platform execution" needs to be off. As soon as I turn that off, it works.

If anyone can explain why that works, I'll award the answer.

4,821

Nicholas Begg

Updated on September 18, 2022

Comments

Nicholas Begg over 1 year
I am currently making an application that lets you create students, and then mark them absent. I want to be able to do this by adding it into a separate table called AbsentStudents. But with the jparepository or the crudreposotroy don't give me these options.

I tried to create a new entity that was a replica of the students entity, then make the dao equal the findbyid of the student. it looked like this:
```
dao.equals(repo.findById(id));
```
Index.jsp:
```
<body>
<p> Add a student into the database:<p>
<form action ="addStudent">
    <input type = "text" name = "ID"><br>
    <input type = "text" name = "Name"><br>
    <input type = "text" name = "Teacher"><br>
    <input type = "submit">
</form>

<p> Mark a Student Absent<p>
<form action ="markAbsent">
    <input type = "text" name = "ID"><br>
    <input type = "submit">
</form>

</body>
</html>
```
Then the absentStudent, which is the same as student
```
@Entity
@Getter
@Setter
public class AbsentStudent
{
    @Id
    private int id;
    public int getId() {
        return id;
    }
}
```
I then created the dao of both the student and absent.

Finally, here is the controller. I left the autowired out.
```
@RequestMapping("/addStudent")
public String addStudent(Student student) {

    repo.save(student);
    return "index.jsp";

}

@RequestMapping("/markAbsent")
public ModelAndView markAbsent(@RequestParam int id) {
    ModelAndView mv = new ModelAndView();

    dao.equals(repo.findById(id));

    mv.setViewName("absent.jsp");
    mv.addObject(dao);



    return mv;

}
```
}

I was expecting a page in the end, which would fetch all the absent students from the database, and post them on a single page. But, I get an error page.

the data didn't copy from student to absent student.
- Nicholas Begg about 5 years
  
  Could I have some help?
- Brandon G about 5 years
  
  Can you show where you declare dao and provide the code for that class?
- Nicholas Begg about 5 years
  
  public interface AbsentDao extends CrudRepository<AbsentStudent, Integer> { }
- Nicholas Begg about 5 years
  
  I declare it at the top with @autowired.
- Nicholas Begg about 5 years
  
  @autowired AbsentDao dao. (In the controller)
evandentremont over 9 years

Don't think, because the host OS and the virtual OS are the same. If it can run natively, why would virtually trip that?
Xen2050 over 9 years

VirtualBox is emulating the TPE, I don't know if your hardware bios has TPE enabled, I've read it's nothing but trouble for linux anyway, but VirutalBox must be doing too good of a job ;-) But why run the exact same linux image for real and emulated?
evandentremont over 9 years

One ubuntu server host, and a bunch of ubuntu server vm's. Want to play around with hhvm / laravel stack and not break anything
Nicholas Begg about 5 years

Thanks, but which query should I use to copy from student to AbsentStudent, and where should I put it?
Robert about 5 years

In my opinion it will be better if you just add a new field into Student entity class (for example boolean absent, NUMBER(1,0) in database) and when you'll mark some student you will just update you students table using @Modifying @Query(value = "update student set absent = 1 where id = :id", nativeQuery = true) public void markAbsentStudent(@Param("id") Integer studentId);, and at the moment when you will need to get all absent students you will call another query @Query(value = "select * from student where absent = 1", nativeQuery = true) public List<Student> getAbsentStudents();
Robert about 5 years

@Modifying annotation says that this query will modify some table in the database. The code i write above should be inside the interface that implements the jparepository or the crudrepository (repository for student)
Robert about 5 years

nativeQuery attribute says that the code inside the value attribute is written in sql (it's jpql by default).
Nicholas Begg about 5 years

Nvm. Got it. Thanks!