看来本机方法 WinDnDClipboard.push（Object []，int） - 由 GlassClipboard.cpp 默默地吞下异常。可以在调试器中看到对Throwable.getMessage（）的回调，但是没有异常打印到控制台。

It appears that native method WinDnDClipboard.push(Object[], int) - backed by GlassClipboard.cpp swallows the exception silently. A call back to Throwable.getMessage() can be seen in the debugger but no exception is printed to the console.

此文件的Java 9版本（ http://hg.openjdk.java.net/openjfx/9-dev/rt/file/1a3f128518cd/modules/javafx.graphics/src/main/native-glass/win/GlassClipboard.cpp ）对Utils.cpp中定义的 CheckAndClearException（env）; 进行额外调用，但这与RT-35400无关。这还没有被移植到Java 8。

The Java 9 version of this file (http://hg.openjdk.java.net/openjfx/9-dev/rt/file/1a3f128518cd/modules/javafx.graphics/src/main/native-glass/win/GlassClipboard.cpp) has an additional call to CheckAndClearException(env); as defined in Utils.cpp, however this is against RT-35400 which appears unrelated. This has not been backported to Java 8.