[jira] [Created] (KAFKA-6313) Kafka Core maven dependencies are missing SLF4J API

["Randall Hauch (JIRA)" <ji...@apache.org>]

Randall Hauch created KAFKA-6313:
------------------------------------

             Summary: Kafka Core maven dependencies are missing SLF4J API
                 Key: KAFKA-6313
                 URL: https://issues.apache.org/jira/browse/KAFKA-6313
             Project: Kafka
          Issue Type: Bug
          Components: core
    Affects Versions: 1.1.0
            Reporter: Randall Hauch
            Priority: Critical
             Fix For: 1.1.0


In an application that depends on the Kafka server artifacts with:

{code:xml}
	<dependency>
		<groupId>org.apache.kafka</groupId>
		<artifactId>kafka_2.11</artifactId>
		<version>1.1.0-SNAPSHOT</version>
	</dependency>
{code}

and then running the server programmatically, the following error occurs:

{noformat}
[2017-11-23 01:01:45,029] INFO Shutting down producer (kafka.producer.Producer:63)
[2017-11-23 01:01:45,051] INFO Closing all sync producers (kafka.producer.ProducerPool:63)
[2017-11-23 01:01:45,052] INFO Producer shutdown completed in 23 ms (kafka.producer.Producer:63)
[2017-11-23 01:01:45,052] INFO [KafkaServer id=1] shutting down (kafka.server.KafkaServer:63)
[2017-11-23 01:01:45,057] ERROR [KafkaServer id=1] Fatal error during KafkaServer shutdown. (kafka.server.KafkaServer:161)
java.lang.NoClassDefFoundError: org/slf4j/event/Level
	at kafka.utils.CoreUtils$.swallow$default$3(CoreUtils.scala:83)
	at kafka.server.KafkaServer.shutdown(KafkaServer.scala:520)
       ...
Caused by: java.lang.ClassNotFoundException: org.slf4j.event.Level
	at java.net.URLClassLoader$1.run(URLClassLoader.java:359)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:348)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:347)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:312)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
	... 25 more
{noformat}

It appears that KAFKA-1044 and [this PR|https://github.com/apache/kafka/pull/3477] removed the use of Log4J from Core but [added use of|https://github.com/confluentinc/kafka/commit/ed8b0315a6c3705b2a163ce3ab4723234779264f#diff-52505b9374ea885e44bcb73cbc4714d6R34] the {{org.slf4j.event.Level}} in {{CoreUtils.scala}}. The {{org.slf4j.event.Level}} class is in the {{org.slf4j:slf4j-api}} artifact, which is currently not included in the dependencies of {{org.apache.kafka:kafka_2.11:1.1.0-SNAPSHOT}}. Because this is needed by the server, the SLF4J API library probably needs to be added to the dependencies.

[~viktorsomogyi] and [~ijuma], was this intentional, or is it intended that the SLF4J API be marked as {{provided}}? BTW, I marked this as CRITICAL just because this probably needs to be sorted out before the release.



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