Running Pycharm IDE with -Xcheck:jni on Linux with the latest OpenJDK resulted in a large number of warning messages following these two unique patterns:

WARNING in native method: JNI call made without checking exceptions when required to from CallIntMethod
at sun.font.FreetypeFontScaler.initNativeScaler(java.desktop@18-internal/Native Method)
at sun.font.FreetypeFontScaler.<init>(java.desktop@18-internal/FreetypeFontScaler.java:67)
at sun.font.FontScaler.getScaler(java.desktop@18-internal/FontScaler.java:102)
at sun.font.TrueTypeFont.getScaler(java.desktop@18-internal/TrueTypeFont.java:1249)
- locked <0x00000000db7b3f60> (a sun.font.TrueTypeFont)
at sun.font.FileFontStrike.<init>(java.desktop@18-internal/FileFontStrike.java:162)
...


WARNING in native method: JNI call made without checking exceptions when required to from CallIntMethod
at sun.font.FreetypeFontScaler.getGlyphImageNative(java.desktop@18-internal/Native Method)
at sun.font.FreetypeFontScaler.getGlyphImage(java.desktop@18-internal/FreetypeFontScaler.java:115)
- locked <0x00000000dce03b60> (a sun.font.FreetypeFontScaler)
at sun.font.FileFont.getGlyphImage(java.desktop@18-internal/FileFont.java:199)
...