Java VisualVM无法检测到本地java程序 的 解决办法

官方描述及解答：
Local Applications Cannot Be Monitored (Error Dialog On Startup)
Description: An error dialog saying that local applications cannot be monitored is shown immediately after VisualVM startup. Locally running Java applications are displayed as <Unknown Application> (pid ###).
Resolution:  This can happen on Windows systems if the username contains capitalized letters. In this case, username is UserName but the jvmstat directory created by JDK is %TMP%\hsperfdata_username. To workaround the problem, exit all Java applications, delete the %TMP%\hsperfdata_username directory and create new %TMP%\hsperfdata_UserName directory.


即：
把%TMP%\hsperfdata_username文件删除，重新建立%TMP%\hsperfdata_UserName文件（username为具体的用户名，区分大小写）。


%TMP%：%TMP%为用户环境变量，在cmd下echo %TMP%可以查看具体路径，或者直接在地址栏输入%TMP%直接进入文件目录。
username：cmd下echo %USERNAME%即可查看用户名。