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From "Jiri Pechanec (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-5953) Connect classloader isolation may be broken for JDBC drivers
Date Thu, 21 Sep 2017 09:19:00 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-5953?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16174490#comment-16174490
] 

Jiri Pechanec commented on KAFKA-5953:
--------------------------------------

Maybe {getResource} method on ClassLoader should be overridden too.

> Connect classloader isolation may be broken for JDBC drivers
> ------------------------------------------------------------
>
>                 Key: KAFKA-5953
>                 URL: https://issues.apache.org/jira/browse/KAFKA-5953
>             Project: Kafka
>          Issue Type: Bug
>          Components: KafkaConnect
>    Affects Versions: 0.11.0.0
>            Reporter: Jiri Pechanec
>            Priority: Critical
>
> Let's suppose there are two connectors deployed
> # using JDBC driver (Debezium MySQL connector)
> # using PostgreSQL JDBC driver (JDBC sink).
> Connector 1 is started first - it executes a statement
> {code:java}
> Connection conn = DriverManager.getConnection(url, props);
> {code}
> As a result a {{DriverManager}} calls {{ServiceLoader}} and searches for all JDBC drivers.
The postgres driver from connector 2) is found associated with classloader from connector
1).
> Connector 2 is started after that - it executes a statement
> {code:java}
> connection = DriverManager.getConnection(url, username, password);
> {code}
> DriverManager finds the connector that was loaded in step before but becuase the classloader
is different - now we use classloader 2) so it refuses to load the class and no JDBC driver
is found.



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