[DiapDealer]

For further reference, the following note/warning has been added to the jre 9.x.x aur package's installer script:

Note2: Since Oracle Java 9, some Qt 5 applications (such as the reader apps Zeal and GoldenDict) will crash due to the existance of the Java NPAPI plugin symlink (/usr/lib/mozilla/plugins/libnpjp2-jre9.so).

See:
- https://github.com/zealdocs/zeal/issues/802
- https://bbs.archlinux.org/viewtopic.php?id=231222

Note that in the event where the jre 9.x.x aur package is an absolute requirement, removing the above symlink is sufficient to restore Sigil (and other programs)'s ability to run.

The Arch-supported OpenJDK 9 package does not install a Java NPAPI browser plugin. The extra package "icedtea-web" provides a Java browser plugin for OpenJDK (and doesn't appear to crash qt5 webkit programs).