RFR: JDK-8276809: java/awt/font/JNICheck/FreeTypeScalerJNICheck.java shows JNI warning on Windows

[Matthias Baesken]

On Tue, 2 Jan 2024 15:03:12 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

> The new test java/awt/font/JNICheck/FreeTypeScalerJNICheck.java introduced with https://bugs.openjdk.java.net/browse/JDK-8269223 adds -Xcheck:jni , and shows on Windows server 2019 the following JNI warning , so the test fails on this Windows version.
> 
>  stdout: [WARNING in native method: JNI call made without checking exceptions when required to from CallStaticVoidMethodV
> 	at sun.awt.Win32GraphicsEnvironment.initDisplay(java.desktop at 23-internal/Native Method)
> 	at sun.awt.Win32GraphicsEnvironment.initDisplayWrapper(java.desktop at 23-internal/Win32GraphicsEnvironment.java:95)
> 	at sun.awt.Win32GraphicsEnvironment.<clinit>(java.desktop at 23-internal/Win32GraphicsEnvironment.java:63)
> 	at sun.awt.PlatformGraphicsInfo.createGE(java.desktop at 23-internal/PlatformGraphicsInfo.java:34)
> 	at java.awt.GraphicsEnvironment$LocalGE.createGE(java.desktop at 23-internal/GraphicsEnvironment.java:93)
> 	at java.awt.GraphicsEnvironment$LocalGE.<clinit>(java.desktop at 23-internal/GraphicsEnvironment.java:84)
> 	at java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(java.desktop at 23-internal/GraphicsEnvironment.java:106)
> 	at FreeTypeScalerJNICheck.runTest(FreeTypeScalerJNICheck.java:53)
> 	at FreeTypeScalerJNICheck.main(FreeTypeScalerJNICheck.java:44)
> 
> 
> We better add an exception check to get rid of the JNI warning (and also of the test failure) .

Okay I can back it out, will create a JBS issue for that.   However the current  JNI warning gives us no real info, just creates noise in our test infrastructure;  the ExceptionDescribe  should be better : "Prints an exception and a backtrace of the stack to a system error-reporting channel, such as stderr. This is a convenience routine provided for debugging."  https://docs.oracle.com/javase/8/docs/technotes/guides/jni/spec/functions.html

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PR Comment: https://git.openjdk.org/jdk/pull/17224#issuecomment-1883367630