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Vahid Hashemian commented on KAFKA-3132: ---------------------------------------- When I use the lowercase "plaintext" and start the broker I get this error after the parameter printout: {{java.lang.IllegalArgumentException: Error creating broker listeners from 'plaintext://:9092': No enum constant org.apache.kafka.common.protocol.SecurityProtocol.plaintext at kafka.server.KafkaConfig.validateUniquePortAndProtocol(KafkaConfig.scala:894) at kafka.server.KafkaConfig.getListeners(KafkaConfig.scala:913) at kafka.server.KafkaConfig.<init>(KafkaConfig.scala:866) at kafka.server.KafkaConfig$.fromProps(KafkaConfig.scala:698) at kafka.server.KafkaConfig$.fromProps(KafkaConfig.scala:695) at kafka.server.KafkaServerStartable$.fromProps(KafkaServerStartable.scala:28) at kafka.Kafka$.main(Kafka.scala:58) at kafka.Kafka.main(Kafka.scala)}} > URI scheme in "listeners" property should not be case-sensitive > --------------------------------------------------------------- > > Key: KAFKA-3132 > URL: https://issues.apache.org/jira/browse/KAFKA-3132 > Project: Kafka > Issue Type: Bug > Components: config > Affects Versions: 0.9.0.0 > Reporter: Jake Robb > Priority: Minor > Labels: newbie > > I configured my Kafka brokers as follows: > {{listeners=plaintext://kafka01:9092,ssl://kafka01:9093}} > With this config, my Kafka brokers start, print out all of the config > properties, and exit quietly. No errors, nothing in the log. No indication of > a problem whatsoever, let alone the nature of said problem. > Then, I changed my config as follows: > {{listeners=PLAINTEXT://kafka01:9092,SSL://kafka01:9093}} > Now they start and run just fine. > Per [RFC-3986|https://tools.ietf.org/html/rfc3986#section-6.2.2.1]: > {quote} > When a URI uses components of the generic syntax, the component > syntax equivalence rules always apply; namely, that the scheme and > host are case-insensitive and therefore should be normalized to > lowercase. For example, the URI <HTTP://www.EXAMPLE.com/> is > equivalent to <http://www.example.com/>. > {quote} -- This message was sent by Atlassian JIRA (v6.3.4#6332)