RFR: JDK-8280902 ResourceBundle::getBundle may throw NPE when invoked by JNI code with no caller frame

[Naoto Sato]

On Wed, 2 Mar 2022 18:56:40 GMT, Tim Prinzing <duke at openjdk.java.net> wrote:

> The caller class returned by Reflection::getCallerClass was used to gain access to it's module in most cases and class loader in one case. I added a method to translate the caller class to caller module so that the decision of what module represents the caller with no stack frame is made in a single place. Calls made to caller.getModule() were replaced with getCallerModule(caller) which returns the system class loader unnamed module if the caller is null.
> 
> The one place a class loader was produced from the caller in getBundleImpl it was rewritten to route through the getCallerModule method:
> 
>         final ClassLoader loader = (caller != null) ?
>                 caller.getClassLoader() : getLoader(getCallerModule(caller));
> 
> A JNI test was added which calls getBundle to fetch a test bundle from a location added to the classpath, fetches a string out of the bundle and verifies it, and calls clearCache.
> 
> The javadoc was updated for the caller sensitive methods changed.

Looks good to me. I believe a CSR is needed for this change.

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Marked as reviewed by naoto (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/7663