[jira] [Created] (FLINK-29288) Can't start a job with a jar in the system classpath

["Yaroslav Tkachenko (Jira)" <ji...@apache.org>]

Yaroslav Tkachenko created FLINK-29288:
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             Summary: Can't start a job with a jar in the system classpath
                 Key: FLINK-29288
                 URL: https://issues.apache.org/jira/browse/FLINK-29288
             Project: Flink
          Issue Type: Bug
          Components: Kubernetes Operator
    Affects Versions: kubernetes-operator-1.1.0
            Reporter: Yaroslav Tkachenko


I'm using the latest (unreleased) version of the Kubernetes operator.

It looks like currently, it's impossible to use it with a job jar file in the system classpath (/opt/flink/lib). *jarURI* is required and it's always passed as a *pipeline.jars* parameter to the Flink process. In practice, it means that the same class is loaded twice: once by the system classloader and another time by the user classloader. This leads to exceptions like this:
{quote}java.lang.LinkageError: loader constraint violation: when resolving method 'XXX' the class loader org.apache.flink.util.ChildFirstClassLoader @47a5b70d of the current class, YYY, and the class loader 'app' for the method's defining class, ZZZ, have different Class objects for the type AAA used in the signature
{quote}
In my opinion, jarURI must be made optional even for the application mode. In this case, it's assumed that it's already available in the system classpath.



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