Github user rmetzger commented on the pull request:
https://github.com/apache/flink/pull/1097#issuecomment-158121645
I think the test cases are not good enough.
I tried it out with this code again:
```java
RequiredParameters rq = new RequiredParameters();
rq.add("input");
rq.add(new
Option("parallelism").alt("p").defaultValue("1").type(OptionType.INTEGER));
ParameterTool pt = ParameterTool.fromArgs(args);
rq.applyTo(pt);
```
and got the following error:
```
Exception in thread "main"
org.apache.flink.api.java.utils.RequiredParametersException: Value null is not
in the list of valid choices
at
org.apache.flink.api.java.utils.RequiredParameters.applyTo(RequiredParameters.java:126)
at
org.apache.flink.examples.java.wordcount.WordCount.main(WordCount.java:64)
```
Passing `--input abc` will result in `RequiredParametersException: Value
abc is not in the list of valid choices`.
The output of the help method looks better now
```
Required Parameters:
--input
-p, --parallelism Set a parallelism for the job default: 1
--ouput This is my help
```
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