从 2.4 升级后 Formatters.register 编译错误

Question

当我运行“activator compile”时，从 2.4 升级到 2.5 后，我遇到了那些奇怪的“非静态”错误:

non-static method  <T>register(java.lang.Class<T>,play.data.format.Formatters.SimpleFormatter<T>) cannot be referenced from a static context

public MyController() {
    Formatters.register(Xpto.class, new XptoConverter());
}

Xpto转换器:

public class XptoConverter extends SimpleFormatter<Xpto> {
  @Override
  public Xpto parse(String input, Locale l) throws ParseException {
    return new Xpto().setId(Long.valueOf(input));
  }

  @Override
  public String print(Xpto xpto, Locale l) {
    return xpto.getId().toString();
  }
}

Answer 1

方法不再是静态的；格式化程序被注入(inject)。参见 https://www.playframework.com/documentation/2.5.x/JavaForms#Register-a-custom-DataBinder .另见 https://github.com/playframework/playframework/pull/5734

你必须

1. 创建 public class FormattersProvider implements Provider<Formatters> (进行转换)
2. 创建 public class FormattersModule extends AbstractModule
3. 启用FormattersModule在application.conf