Suggestion - make Zotero recognise Zulu OpenJDK
On Windows 10 64-bit I had big trouble with Java for LibreOffice plugin. Oracle 32-bit compilation was recognized by Zotero, but not by LibreOffice 64 bit, and manually adding this Java installation in LO worked only for a moment and then it disappeared. Oracle Java 64-bit was not recognized by either of the programmes (well, not by Zotero for sure; I am not 100% certain it was not recognized by LO). I installed Zulu 64-bit. Zotero doesn't recognize it, but by locating OpenOffice plugin installer file and running it I am able to install it and then it works great. It would be great if Zotero recognized this Java version out of the box.