I have the following BeanValidation code that works fine, and permits to validate that a bean annotated with:

```
  @EnumValue(enumClass = MyTestEnum.class)
  private String field;

  public enum MyTestEnum {
    VAL1, VAL2;
  }

```

Will be validated only if the field value is "VAL1" or "VAL2".

```
public class EnumNameValidator implements ConstraintValidator<EnumValue, String> {

  private Set<String> AVAILABLE_ENUM_NAMES;

  @Override
  public void initialize(EnumValue enumValue) {
    Class<? extends Enum<?>> enumSelected = enumValue.enumClass();
    Set<? extends Enum<?>> enumInstances = Sets.newHashSet(enumSelected.getEnumConstants());
    AVAILABLE_ENUM_NAMES = FluentIterable
            .from(enumInstances)
            .transform(PrimitiveGuavaFunctions.ENUM_TO_NAME)
            .toImmutableSet();
  }

  @Override
  public boolean isValid(String value, ConstraintValidatorContext context) {
    if ( value == null ) {
      return true;
    } else {
      return AVAILABLE_ENUM_NAMES.contains(value);
    }
  }

}

```

What I don't understand is why my first attempt failed. Using instead of the `enumSelected.getEnumConstants()` above the following code:

```
Set<? extends Enum<?>> enumInstances = EnumSet.allOf(enumSelected);

```

Intellij 12 doesn't highlight any error, but the compiler says:

```
java: method allOf in class java.util.EnumSet<E> cannot be applied to given types;
  required: java.lang.Class<E>
  found: java.lang.Class<capture#1 of ? extends java.lang.Enum<?>>
  reason: inferred type does not conform to declared bound(s)
    inferred: capture#1 of ? extends java.lang.Enum<?>
    bound(s): java.lang.Enum<capture#1 of ? extends java.lang.Enum<?>>

```

---

I don't understand the problem, and I also have that code which works fine:

```
  private static <T extends Enum<T> & EnumAlternativeName> T safeGetByAlternativeName(Class<T> enumClass, String alternativeName) {
    for ( T t : EnumSet.allOf(enumClass) ) {
      if ( t.getAlternativeName().equals(alternativeName) ) {
        return t;
      }
    }
    return null;
  }

```