Wsrtjtyk

Code's written in scala but Exception is from java.lang. I am trying to connect my basic scala + play app to database. I am using a tutorial https://www.youtube.com/watch?v=Zdt_utUOd5s&list=PLYPFxrXyK0Bx9SBkNhJr1e2-NlIq4E7ED&index=21

Everything worked just like in the video until 7:40 rolled around. Instead of getting the option to run an sql script i get this bizarre error:

VerifyError: Bad type on operand stack

Exception Details:

Location:
models/Book.(ILjava/lang/String;ILjava/lang/String;)V @2: invokevirtual

Reason:
Type uninitializedThis (current frame, stack[0]) is not assignable to 'models/Book'

Current Frame:
bci: @2
flags: { flagThisUninit }
locals: { uninitializedThis, integer, 'java/lang/String', integer, 'java/lang/String' }

stack: { uninitializedThis, integer }

Bytecode:
0000000: 2a1b b600 d52a 2cb6 00d8 2a1d b600 db2a
0000010: 1904 b600 de2a b700 e12a bb00 e359 2ab7
0000020: 00e6 b500 e82a b800 ec2a 1bb6 005a 2a2c
0000030: b600 622a 1db6 0069 2a19 04b6 0070 b1

And a bit of Stack Trace:

Here is my models.Book class:

package models



import io.ebean.Model

import javax.persistence.{Entity, Id}



@Entity

case class Book(identifier: Int, title1: String, price1: Int, author1: String)  extends Model {

  @Id

  var id: Int = identifier

  var title: String = title1

  var price: Int = price1

  var author: String = author1



  override def toString: String = s"id = $id $title written by $author"

And Bookset object

import scala.collection.mutable.HashSet



object BookSet {





  val set: HashSet[Book] = HashSet[Book]()









  add(Book(1,"C++",20,"This one Danish Guy"))

  add(Book(2,"Java",30,"Sun Mirco"))

  add(Book(3,"Gone with the wind",60,"Some dude"))

  add(Book(4,"Catcher in the Rye",20,"Some other dude"))





  def findById(id: Int): Book = {

    var mybook: Book = null

    set foreach { book =>

      if(book.id == id) mybook = book

    }

    mybook

  }





  def add(book: Book) = {

    set.add(book)

    //bookIndex+=1



  }



  def remove(book: Book) = {

    set.remove(book)

  }

I've done all the required prep work (build.sbt, plugins.sbt, app.conf) the guy in the video did. I have the line : db.default.enabled = true in my app.conf file and I've added

libraryDependencies ++= Seq(evolutions, jdbc) 

to build.sbt

I've noticed that after I remove the @Entity annotation i don't get the exception nor the option to run sql script =. What is causing the problem and how do fix it? Is is because I am using Scala classes instead of plain POJO's ?