why specified convert not effect ?

I create a JobPriorityConverter class, it's inherit from EnumConverter.

public class JobPriorityConverter extends EnumConverter<JobPriority> {
  public JobPriorityConverter(final String str, final Class<JobPriority> clazz) {
    super(str, clazz);
  }

  @Override
  public JobPriority convert(String value) {
    JobPriority jobPriority = super.convert(value);
    if (jobPriority == JobPriority.VERY_HIGH || jobPriority == JobPriority.UNKNOWN_JOB_PRIORITY) {
      return JobPriority.HIGH;
    } else {
      return jobPriority;
    }
  }
}

The JobPriority is generated by proto, it look like below

public enum JobPriority implements com.google.protobuf.ProtocolMessageEnum {
  UNKNOWN_JOB_PRIORITY(0),
  VERY_HIGH(1),
  HIGH(2),
  NORMAL(3),
  UNRECOGNIZED(-1);
}

Now, I have a parameter.

@Parameter(names = {"--priority"}, converter = JobPriorityConverter.class)
protected JobPriority priority = JobPriority.NORMAL;

But I run the program, for example: java -classpath xxx ... className --priority VERY_HIGH, then it should be HIGH, actually it's still VERY_HIGH.

I pass the invalid priority, it output.

Exception in thread "main" com.beust.jcommander.ParameterException: Invalid value for -pr parameter. Allowed values:[UNKNOWN_JOB_PRIORITY, VERY_HIGH, HIGH, NORMAL, UNRECOGNIZED]
    at com.beust.jcommander.converters.EnumConverter.convert(EnumConverter.java:38)
    at com.beust.jcommander.converters.EnumConverter.convert(EnumConverter.java:13)
    at com.beust.jcommander.JCommander.convertValue(JCommander.java:1472)
    at com.beust.jcommander.ParameterDescription.addValue(ParameterDescription.java:238)
    at com.beust.jcommander.JCommander.processFixedArity(JCommander.java:895)
    at com.beust.jcommander.JCommander.processFixedArity(JCommander.java:870)
    at com.beust.jcommander.JCommander.parseValues(JCommander.java:721)
    at com.beust.jcommander.JCommander.parse(JCommander.java:340)
    at com.beust.jcommander.JCommander.parse(JCommander.java:319)

cbeust / jcommander

why specified convert not effect ? #545