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From "Ryan P (JIRA)" <j...@apache.org>
Subject [jira] [Created] (KAFKA-4247) kafka-run-class has potential to add a leading colon to classpath
Date Mon, 03 Oct 2016 18:15:20 GMT
Ryan P created KAFKA-4247:

             Summary: kafka-run-class has potential to add a leading colon to classpath
                 Key: KAFKA-4247
                 URL: https://issues.apache.org/jira/browse/KAFKA-4247
             Project: Kafka
          Issue Type: Bug
          Components: KafkaConnect
            Reporter: Ryan P
            Assignee: Ryan P


In the event CLASSPATH has not yet been populated this will result in 


Normally this wouldn't be a problem however Connect's AbstractClassHearder uses ClasspathHelper.forJavaClassPath()
to collect it's eligible classes. 

With a leading Colon you will endup with builder[0] = null which translates to the working

java -cp ":" test

java -cp ":Users" test
[file:/Users/ryan/, file:/Users/ryan/Users]

This is problematic if the script was run from the root directory since Reflections will scan
the directories recursively. Ultimately leading to a situation where the entire FileSystem
is scanned. This has proven problematic for some Docker installations. 

Typically this is worked around by editing the the kafka-run-class script however I think
we should handle this within Connect itself by excluding the root directory. 


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