FULL PRODUCT VERSION :
openjdk version "1.8.0_91"
OpenJDK Runtime Environment (IcedTea 3.0.1) (suse-12.1-x86_64)
OpenJDK 64-Bit Server VM (build 25.91-b14, mixed mode)


ADDITIONAL OS VERSION INFORMATION :
Linux NGEP14 4.1.20-11-default #1 SMP PREEMPT Fri Mar 18 14:42:07 UTC 2016 (0a392b2) x86_64 x86_64 x86_64 GNU/Linux

A DESCRIPTION OF THE PROBLEM :
This is just a typo in keysym2ucs.h: (for instance, src/solaris/classes/sun/awt/X11/keysym2ucs.h):

line 1688:
0x242c #define XK_topt 0x9f7

This should be 0x252c instead of 0x242c. U+242C is not even defined.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. Have a custom X11 keyboard layout with "topt" assigned to some key:
  xmodmap -e "keysym KP_Minus = topt"

2. Press this key in any Java-based editor, say jEdit.


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Displays the Symbol ┬ (U+252C: BOX DRAWINGS LIGHT DOWN AND HORIZONTAL).

ACTUAL -
Depending on the default font, it displays a replacement character for U+242C (not defined).

REPRODUCIBILITY :
This bug can be reproduced always.

CUSTOMER SUBMITTED WORKAROUND :
Workaround: use keysym U252c instead of topt in the definition of the keyboard layout