Re: GWT 2.5 RC2 EntityProxy Validation

On Tuesday, November 6, 2012 10:13:59 AM UTC+1, Thomas Broyer wrote:

Couldn't you simply override the methods and refine the return type? (Java has covariant return types)

interface Employee {

  Employee getBoss();

}

interface EmployeeProxy extends Employee, EntityProxy {

  EmployeeProxy getBoss();

}

class EmployeeEntity implements Employee {

  @Override

  public EmployeeEntity getBoss() { … }

}

It gets more difficult for setters though:

  interface Employee {

    ...

    void setBoss(Boss boss);

  }

can't be implemented in Java by

  class EmployeeEntity implements Employee {

    @Override

    public void setBoss(BossEntity boss) { … }

  }

So you could use generics

  interface Employee<B extends Boss> {

    ...

    void setBoss(B boss);

  }

  class EmployeeEntity implements Employee<BossEntity> {

    @Override

    public void setBoss(BossEntity boss) { … }

  }

However, once I tried this (with GWT 2.5.0), it led to an Exception (only when I define setters) - sorry, I don't exactly remember which Exception it was, and I'm a little bit short of time at the moment to pursue it further. (Maybe related to http://code.google.com/p/google-web-toolkit/issues/detail?id=5762 ?)

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