java – OptimisticLockException与Ebean / Play

[OptimisticLockException: Data has changed. updated [0] rows sql[update person 
set name=? where id=? and email=? and name=? and password is null and created=? 
and deleted is null] bind[null]]

我明白,这是试图告诉我,当我阅读它和我试图写它之间的记录已经改变了.但是,这种方法中唯一的变化是发生.

public void updateFromForm(Map<String,String[]> form) throws Exception {
    this.name = form.get("name")[0];

    String password = form.get("password")[0];
    if (password != null && password.length() != 0) {
        String hash = Password.getSaltedHash(password);
        this.password = hash;
    }

    this.update();
}

我这样做错了吗？我在zentasks中看到类似的逻辑.另外,我可以看到绑定变量的值吗？

更新：我从控制器内部调用updateFromForm()：

@RequiresAuthentication(clientName = "FormClient")
public static Result updateProfile() throws Exception {

    final CommonProfile profile = getUserProfile();
    String email = getEmail(profile);           
    Person p = Person.find.where().eq("email",email).findList().get(0);

    Map<String,String[]> form = request().body().asFormUrlEncoded();

    if (p == null) {
        Person.createFromForm(form);
    } else {
        p.updateFromForm(form);
    }

    return ok("HI");
}