ADVANCED ROES ALERT FOR OS X SYSTEMS: KNOWN ISSUE WITH SCROLL BAR USAGE ON UPCOMING OS X 10.11 EL CAPITAN
A major issue has been uncovered in Java applications that make use of scroll bars in the next version of OS X, 10.11 El Capitan. Tests using the latest developer beta releases have revealed that any click in/attempted use of a scroll bar causes a Java application to crash.
While scroll gestures work for these areas, with the El Capitan release coming soon we are advising against upgrading from 10.10 Yosemite to the new 10.11 until this is resolved between Apple and Oracle (there are presently bug reports submitted for this issue with both development communities).
We will let you know as soon as there is any further news (or a fix) available.