Github user rmetzger commented on the pull request:
https://github.com/apache/flink/pull/1097#issuecomment-157645907
Thank you for reviewing the pull request while I was away @fhueske.
I've just tried it out with this code:
```java
RequiredParameters rp = new RequiredParameters();
rp.add("input");
rp.add("output");
rp.add(new Option("parallelism").alt("p").help("Set the parallelism for all
operators").type(OptionType.INTEGER));
ParameterTool pt = ParameterTool.fromArgs(args);
try {
rp.applyTo(pt);
} catch(RequiredParametersException rpe) {
System.out.println(rp.getHelp());
System.exit(1);
}
```
and the output is the following:
```
Required Parameter
name, short name, help text, default valueinput null
output null
parallelism p Set the parallelism for all operators
```
I think the `getHelp` method is not producing helpful output here.
How about something like:
```
Required Parameters:
--input
--output
-p, --parallelism Set the parallelism for all operators
```
The `RequiredParametersException` could list the missing arguments.
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