title: I couldn't get the data from postman in my Spring boot project?
body: <p>Table is created when I'm running the spring project but when I get the values from postman
  It says 500 internal server error</p>
  <ol>
  <li>Bookmark class</li>
  </ol>
  <p><a href="https://i.stack.imgur.com/4Lz0s.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/4Lz0s.png" alt="Bookmark Class" /></a></p>
  <p>2.. Bookmark controlller
  <a href="https://i.stack.imgur.com/GrRA4.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/GrRA4.png" alt="enter image description here" /></a></p>
  <p><a href="https://i.stack.imgur.com/cg3Vb.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/cg3Vb.png" alt="enter image description here" /></a></p>
  <p><a href="https://i.stack.imgur.com/TRlPR.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/TRlPR.png" alt="enter image description here" /></a></p>