Seasar Beans.copy and non-existent properties

Purpose

In business org.seasar.framework.beans.util.Beans#copy I sometimes use.

It's convenient, but I don't use it often, so I'm worried about the following two points each time I use it.

--Does an error occur if there is a property that exists in the copy source but not in the copy destination? --Is it an error if there is a property in the copy destination that is not in the copy source?

Javadoc looks like this about the above I didn't write it, so I tested it.

Conclusion

--Neither will result in an error. --Properties that are not in the source but in the destination are not affected (the pre-assigned values remain).

Code executed

import org.seasar.framework.beans.util.Beans;

public class BeansTest {

  /**Copy source class*/
  public static class Src {
    public String name;
    public String hobby; //Properties not in Dest
  }

  /**Copy destination class*/
  public static class Dest {
    public String name;
    public String address; //Properties not in Src

    @Override
    public String toString() {
      return String.format("name=%s, address=%s", name, address);
    }
  }

  public static void main(String[] args) {
    Src src = new Src();
    src.name = "Kozure Hanako";
    src.hobby = "bicycle";

    Dest dest = new Dest();
    dest.address = "Chiyoda ward, Tokyo";

    //Copy execution
    Beans.copy(src, dest).execute();
    System.out.println(dest); // -> name=Kozure Hanako, address=Chiyoda ward, Tokyo
  }
}