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Class mypack.pages.User has been transformed and may not be directly instantiated

I am trying to display a grid with tapestry based on this Tutorial, but i'm getting this error Class mypack.pages.User has been transformed and may not be directly instantiated those are my classes User 

    public class User {     
        @NonVisual
        private long id;

        private String firstName;

        private String lastName;

        private int age;

        public long getId() { return id; }

        public void setId(long id) { this.id = id; }

        public String getFirstName() { return firstName; }

        public void setFirstName(String firstName) { this.firstName = firstName; }

        public String getLastName() { return lastName; }

        public void setLastName(String lastName) { this.lastName = lastName; }

        public int getAge() { return age; }

        public void setAge(int age) { this.age = age; }

        public User(long id, String firstName, String lastName, int age) {
            super();
            this.id = id;
            this.firstName = firstName;
            this.lastName = lastName;
            this.age = age;
        }
}

Bellilpage.java

public class Bellilpage {
     @Property
        private User user;

    public List<User> getUsers() { 

         List<User> dd= new ArrayList<User>();
         for(int x=0;x<1;x++)
         {
             Random rand = new Random(); 
             long d= rand.nextInt(50);
            User myuser = new User(d, "Name N° "+d, "lastName N "+d, (int) (d+15));

        dd.add(myuser);
         }

         return dd; }

}

and finally this is how i try to display the grid in the web page Bellilpage.tml

<html t:type="layout" title="tapestrythetest Index"
      t:sidebarTitle="Framework Version"
      xmlns:t="http://tapestry.apache.org/schema/tapestry_5_3.xsd"
      xmlns:p="tapestry:parameter">
    <!-- A Zone is a component that can be updated in place, triggered by other components. -->
    <t:zone t:id="zone">
      <h1>List Users</h1>

        <t:grid source="users"  row="user">
            <p:lastNameCell>
           ${user.lastname} 
            </p:lastNameCell>

        </t:grid>
    </t:zone>

    <p:sidebar>

    </p:sidebar>

</html>

Why am i gtting this error when i open Bellilpage.tml?

Solution

  • You are getting the error because mypack.pages is a T5 controlled package. Move your User class to a different package, e.g. to mypack.entities. More info at Component Classes, specifically the Component Packages section.