Github user ecararus commented on the issue:
https://github.com/apache/storm/pull/2228
@srdo my topology.yaml has:
```
config:
nimbus.seeds: ${nimbus.seeds}
```
The property from dev.properties is loaded by
[FluxParser](https://github.com/apache/storm/blob/master/flux/flux-core/src/main/java/org/apache/storm/flux/parser/FluxParser.java#L86)
see line 100 there ```nimbus.seeds``` is treated as string and when on
NimbusClient.java we try to :
```
seeds = (List<String>) conf.get(Config.NIMBUS_SEEDS);
```
then I'm getting class cast ex. and in the exception we can see mesage
Can't use ["host"] it is ....
As @revans2 suggested before cast we need to check if this is an array, in
the situation described above it is configured as array of hosts but parser
istreating as a string with "[host]" .
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