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我刚刚升级到 Ubuntu 15.10 Beta。唯一的问题是有关 Freemind 和 Java 这是我的安装：

lsb_release -rd
Description:    Ubuntu Wily Werewolf (development branch)
Release:    15.10

freemind

拿起JAVA_TOOL_OPTIONS：

 -javaagent:/usr/share/java/jayatanaag.jar 
 Checking Java Version...
 The program 'java' received an X Window System error.

这可能反映了程序中的错误。错误是“BadValue（整数参数超出操作范围）”。

((详情：serial 117 error_code 2 request_code 138 minor_code 2) （程序员注意：通常，X错误是异步报告的；也就是说，您会在导致错误后一段时间收到该错误。要调试您的程序，请使用 - -sync 命令行选项来改变这种行为。如果你在 gdk_x_error() 函数上中断，你可以从你的调试器中得到一个有意义的回溯。）

问题是：为什么这是一个随机错误？有时 Freemind 会出现以下错误：

STDERR: Unable to set Look & 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
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