[jira] [Closed] (FLINK-13451) Rework CommonTestUtils.createClassNotInClassPath() to not use Unsafe.defineClass()

["Stephan Ewen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-13451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Stephan Ewen closed FLINK-13451.
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> Rework CommonTestUtils.createClassNotInClassPath() to not use Unsafe.defineClass()
> ----------------------------------------------------------------------------------
>
>                 Key: FLINK-13451
>                 URL: https://issues.apache.org/jira/browse/FLINK-13451
>             Project: Flink
>          Issue Type: Improvement
>          Components: Tests
>    Affects Versions: 1.9.0
>            Reporter: Stephan Ewen
>            Assignee: Stephan Ewen
>            Priority: Critical
>              Labels: pull-request-available
>             Fix For: 1.10.0
>
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> The method {{Unsafe.defineClass()}} is removed in Java 11.
> To support Java 11, we need to rework the method {{CommonTestUtils.createClassNotInClassPath()}} to use a different mechanism.
> Java 11 introduces a new way to define a class from byte code via {{MethodHandles}}. However, because these do not exist in Java 8, we cannot use them if we want to keep supporting Java 8, which we most likely want to do for quite a while.
> A method that works across both versions is to write the class byte code out to a temporary file and create a new URLClassLoader that loads the class from that file.
> That solution is not a complete drop-in replacement, because it cannot add the class to an existing class loader, but can only create a new pair of (classloader & new-class-in-that-classloader). But it is seems straightforward to adjust the existing tests to work with that.



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