ddanielr opened a new pull request, #4212:
URL: https://github.com/apache/accumulo/pull/4212
Gson returns a null array when `executors` either isn't defined, or is an
empty string.
The code then throws an NPE when attempting to iterate through the array.
```
ExecutorConfig[] execConfigs =
new Gson().fromJson(params.getOptions().get("executors"),
ExecutorConfig[].class);
List<Executor> tmpExec = new ArrayList<>();
for (ExecutorConfig executorConfig : execConfigs) {
```
This change throws an IllegalStateException before the NPE would occur and
adds an actionable exception message.
This change is only targeted to `2.1` as this situation is already handled
in `main`.
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