Myujth

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 ?