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. -- This message was sent by Atlassian JIRA (v6.4.14#64029)