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https://issues.apache.org/jira/browse/KAFKA-5229?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Bharat Viswanadham updated KAFKA-5229:
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Priority: Major (was: Minor)
> Reflections logs excessive warnings when scanning classpaths
> ------------------------------------------------------------
>
> Key: KAFKA-5229
> URL: https://issues.apache.org/jira/browse/KAFKA-5229
> Project: Kafka
> Issue Type: Bug
> Components: KafkaConnect
> Affects Versions: 0.10.0.0, 0.10.0.1, 0.10.1.0, 0.10.1.1, 0.10.2.0,
> 0.10.2.1
> Reporter: Ewen Cheslack-Postava
> Assignee: Bharat Viswanadham
> Labels: newbie
>
> We use Reflections to scan the classpath for available plugins (connectors,
> converters, transformations), but when doing so Reflections tends to generate
> a lot of log noise like this:
> {code}
> [2017-05-12 14:59:48,224] WARN could not get type for name
> org.jboss.netty.channel.SimpleChannelHandler from any class loader
> (org.reflections.Reflections:396)
> org.reflections.ReflectionsException: could not get type for name
> org.jboss.netty.channel.SimpleChannelHandler
> at org.reflections.ReflectionUtils.forName(ReflectionUtils.java:390)
> at org.reflections.Reflections.expandSuperTypes(Reflections.java:381)
> at org.reflections.Reflections.<init>(Reflections.java:126)
> at
> org.apache.kafka.connect.runtime.PluginDiscovery.scanClasspathForPlugins(PluginDiscovery.java:68)
> at
> org.apache.kafka.connect.runtime.AbstractHerder$1.run(AbstractHerder.java:391)
> at java.lang.Thread.run(Thread.java:745)
> Caused by: java.lang.ClassNotFoundException:
> org.jboss.netty.channel.SimpleChannelHandler
> at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
> at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
> at java.security.AccessController.doPrivileged(Native Method)
> at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
> at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
> at org.reflections.ReflectionUtils.forName(ReflectionUtils.java:388)
> ... 5 more
> {code}
> Despite being benign, these warnings worry users, especially first time users.
> We should either a) see if we can get Reflections to turn off these specific
> warnings via some config or b) make Reflections only log at > WARN by default
> in our log4j config. (b) is probably safe since we should only be seeing
> these at startup and I don't think I've seen any actual issue logged at WARN.
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