Type safety: The expression of type ... needs unchecked conversion to conform to ...

[nwboy74]

I have two classes: MakeMeHappy and ServeMe. ServeMe has a method that returns a List<Field>. But in MakeMeHappy, there is a warning that I don't understand how to get rid of (reported on line 11 of MakeMeHappy):

Type safety: The expression of type List needs unchecked conversion to conform to List<Field>

I'd like to know how to properly fix it so I am warning-free.

package barnacles;

import java.util.ArrayList;
import java.util.List;

import net.sf.click.control.Field;

public class ServeMe {
  
  private final List<Field> fields = new ArrayList<Field>();
  
  public List<Field> getFields() {
    return this.fields;
  }

}

package barnacles;

import java.util.List;

import net.sf.click.control.Field;

public class MakeMeHappy {
  
  public void doSomething() {
    ServeMe server = new ServeMe();
    List<Field> fields = server.getFields();
    // do stuff with the list
  }

}

I'd prefer to avoid adding @SupressWarnings.

[DarrylBurke]

That's not a compiler message. Is it a warning from your IDE? Also, is this ite actual and complete code that produces that warning, or have you removed some stuff to make it shorter for posting on a forum?

I didn't see anything there that should generate a 'unchecked conversion' warning, so just to be sure, I created a similar code that doesn't depend on any non-JDK classes, and it compiles without warnings.

Try compiling from the command line.

db

[kaydell2]

I copied and pasted your code into Eclipse. I didn't have the Field class so I made one up. The only warning that I got is that fields isn't used.

Will you post whole whole files including the Field class and I'll try it again.