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https://issues.apache.org/jira/browse/FLINK-5690?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16001826#comment-16001826
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Shannon Carey commented on FLINK-5690:
--------------------------------------
Regarding the comment:
{quote}
Mh, that's weird. According to this answer
(http://stackoverflow.com/questions/7076414/java-lang-illegalaccesserror-tried-to-access-method)
the IllegalAccessError is caused by compile time / runtime version mismatches,
not by different classloaders.
{quote}
You might get IllegalAccessError if the class or method is eg. protected or
default scope (not public or private) and the class trying to access it is in
the same package but from a different classloader. We're having this problem
when we try to use a more recent version of Typesafe Config, and I'm not sure
why it's not using the user code classloader provided via
Thread#setContextClassLoader().
> protobuf is not shaded properly
> -------------------------------
>
> Key: FLINK-5690
> URL: https://issues.apache.org/jira/browse/FLINK-5690
> Project: Flink
> Issue Type: Bug
> Components: Build System
> Affects Versions: 1.1.4, 1.3.0
> Reporter: Andrey
> Assignee: Robert Metzger
>
> Currently distributive contains com/google/protobuf package. Without proper
> shading client code could fail with:
> {code}
> Caused by: java.lang.IllegalAccessError: tried to access method
> com.google.protobuf.XXXX
> {code}
> Steps to reproduce:
> * create job class "com.google.protobuf.TestClass"
> * call com.google.protobuf.TextFormat.escapeText(String) method from this
> class
> * deploy job to flink cluster (usign web console for example)
> * run job. In logs IllegalAccessError.
> Issue in package protected method and different classloaders. TestClass
> loaded by FlinkUserCodeClassLoader, but TextFormat class loaded by
> sun.misc.Launcher$AppClassLoader
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