Basic JavaFX example produces warnings upon exit Follow

I thought I'd try the JavaFX example and so created a new program based on that template and just ran it. When I quit it, JetBrains displayed the lines below in the console. Some funky async activity?

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Java has been detached already, but someone is still trying to use it at -[GlassMenu menuWillOpen:]:/HUDSON/workspace/8u45-wk/label/macosx-universal-30/rt/modules/graphics/src/main/native-glass/mac/GlassMenu.m:171
Java has been detached already, but someone is still trying to use it at -[GlassMenu validateMenuItem:]:/HUDSON/workspace/8u45-wk/label/macosx-universal-30/rt/modules/graphics/src/main/native-glass/mac/GlassMenu.m:194
Java has been detached already, but someone is still trying to use it at -[GlassMenu validateMenuItem:]:/HUDSON/workspace/8u45-wk/label/macosx-universal-30/rt/modules/graphics/src/main/native-glass/mac/GlassMenu.m:194
Java has been detached already, but someone is still trying to use it at -[GlassMenu validateMenuItem:]:/HUDSON/workspace/8u45-wk/label/macosx-universal-30/rt/modules/graphics/src/main/native-glass/mac/GlassMenu.m:194
Java has been detached already, but someone is still trying to use it at -[GlassMenu validateMenuItem:]:/HUDSON/workspace/8u45-wk/label/macosx-universal-30/rt/modules/graphics/src/main/native-glass/mac/GlassMenu.m:194
Java has been detached already, but someone is still trying to use it at -[GlassMenu menuDidClose:]:/HUDSON/workspace/8u45-wk/label/macosx-universal-30/rt/modules/graphics/src/main/native-glass/mac/GlassMenu.m:181

Process finished with exit code 0