[jira] [Created] (KAFKA-3237) ConfigDef validators require a default value

[Jeremy Custenborder (JIRA)]

Jeremy Custenborder created KAFKA-3237:
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             Summary: ConfigDef validators require a default value
                 Key: KAFKA-3237
                 URL: https://issues.apache.org/jira/browse/KAFKA-3237
             Project: Kafka
          Issue Type: Bug
          Components: config
    Affects Versions: 0.9.0.0
            Reporter: Jeremy Custenborder
            Priority: Minor


I should be able to add a ConfigDef that has a validator but does has null as 
the default value. This would allow me to have a required property that is 
restricted to certain strings in this example. 
{code}
ConfigDef def = new ConfigDef();
def.define(key, Type.STRING, null, ValidString.in("ONE", "TWO", "THREE"), 
Importance.HIGH, "docs");
{code}

{code}
Invalid value null for configuration test: String must be one of: ONE, TWO, 
THREE
org.apache.kafka.common.config.ConfigException: Invalid value null for 
configuration enum_test: String must be one of: ONE, TWO, THREE
        at 
org.apache.kafka.common.config.ConfigDef$ValidString.ensureValid(ConfigDef.java:349)
        at 
org.apache.kafka.common.config.ConfigDef$ConfigKey.<init>(ConfigDef.java:375)
{code}




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