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https://issues.apache.org/jira/browse/FLINK-13451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Stephan Ewen updated FLINK-13451:
---------------------------------
Description:
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.
was:
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.
> 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
> Priority: Critical
> 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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