Stephan Ewen created FLINK-13451:
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Summary: 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: core
Affects Versions: 1.9.0
Reporter: Stephan Ewen
Fix For: 1.10.0
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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