ubuntu - Ububtu 15.10 beta 'java' received an X Window System error Freemind not working -

i upgraded ubuntu 15.10 beta. problem related freemind , java installation:

lsb_release -rd description:    ubuntu wily werewolf (development branch) release:    15.10  freemind 

picked java_tool_options:

 -javaagent:/usr/share/java/jayatanaag.jar   checking java version...  program 'java' received x window system error. 

this reflects bug in program. error 'badvalue (integer parameter out of range operation)'.

((details: serial 117 error_code 2 request_code 138 minor_code 2) (note programmers: normally, x errors reported asynchronously; is, receive error while after causing it. debug program, run --sync command line option change behavior. can meaningful backtrace debugger if break on gdk_x_error() function.)

the question is: why random error? freemind started following errors:

stderr: unable set & feel. stdout: text stdout: list stdout: list stdout: list stdout: list stdout: list stdout: list stdout: list stdout: list stdout: list stdout: list stdout: page tab list stderr: exception in thread "thread-1"  stderr: java.lang.nullpointerexception stderr: exception in thread "thread-8"  stderr: java.lang.nullpointerexception stderr: exception in thread "thread-14"  stderr: java.lang.nullpointerexception stderr: exception in thread "thread-15"  stderr: java.lang.nullpointerexception stderr: exception in thread "thread-16"  stderr: java.lang.nullpointerexception stderr: exception in thread "thread-18"  stderr: java.lang.nullpointerexception stderr: exception in thread "thread-20"  stderr: java.lang.nullpointerexception stderr: exception in thread "thread-27"  stderr: java.lang.nullpointerexception stderr: exception in thread "thread-28"  stderr: java.lang.nullpointerexception stderr: exception in thread "thread-30"  stderr: java.lang.nullpointerexception stderr: exception in thread "thread-32"  stderr: java.lang.nullpointerexception stderr: exception in thread "thread-35"  stderr: java.lang.nullpointerexception stderr: exception in thread "thread-36"  stderr: java.lang.nullpointerexception stderr: exception in thread "thread-37"  stderr: java.lang.nullpointerexception stderr: exception in thread "thread-38"  stderr: java.lang.nullpointerexception stderr: exception in thread "thread-39"  stder