Github user revans2 commented on the pull request:
https://github.com/apache/storm/pull/785#issuecomment-146926754
@jerrypeng Perhaps we can do a hybrid approach, where we have validation
for complex types made up of something that is a bit ugly, but expressive. And
a set of simple annotations for common types. for example
```
@Validate(type=Map.class, nullAllowed=false,
key=@Validate(type=String.class),
value=@Validate(type=Number.class, min=0, max=500))
public static final String MY_MAP_CONF="my.map.conf";
@Validate(type=List.class, value=@Validate(type=String.class))
public static final String MY_LIST_OF_STRINGS="my.list.of.strings";
@IntValidator(min=0, nullAllowed=false)
public static final String MY_INT_CONF="my.int.conf";
//And for the really strange types
@Validate(type=List.class, value=@Validate(type=Map.class,
validator=RegistryValidator.class))
public static final String TOPOLOGY_METRICS_CONSUMER_REGISTER =
"topology.metrics.consumer.register";
```
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