Widget and validation gallery

@Option
String config;

@Option
@Credential
String config;

@Option
@Textarea
String config;

@Option
Boolean config;

@Option
@Proposable("valuesProvider")
String config;
/** service class */
@DynamicValues("valuesProvider")
public Values actions(){
  return new Values(asList(new Values.Item("1", "Delete"),
                    new Values.Item("2", "Insert"),
                    new Values.Item("3", "Update")));
}

@Option
ActionEnum config;

/** Define enum */
enum ActionEnum {
    Delete,
    Insert,
    Update
}

@Option
List<MyObject> config;

@Code("java")
@Option
String config;

@Option
@Structure
List<String> config;

/** configuration class */
@Option
@Validable("url")
String config;

/** service class */
@AsyncValidation("url")
ValidationResult doValidate(String url) {
//validate the property
}

/** configuration class */
@Option
@Pattern("/^[a-zA-Z\\-]+$/")
String username;

@Datastore
@Checkable
public class config {
/** config ...*/
}

/** service class */
@HealthCheck
public HealthCheckStatus testConnection(){

//validate the connection
}