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    via by Unknown author

    Needs to add netty-transport-native-epoll with a OS classifier to the classpath, it's not included in netty-all

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java.lang.NoClassDefFoundError: org/apache/kafka/clients/producer/Callback at java.lang.Class.forName0(Native Method) at java.lang.Class.forName( at org.syslog_ng.SyslogNgClassLoader.loadClass( by: java.lang.ClassNotFoundException: org.apache.kafka.clients.producer.Callback at at java.lang.ClassLoader.loadClass( at sun.misc.Launcher$AppClassLoader.loadClass( at java.lang.ClassLoader.loadClass( ... 3 more