How do I understand the exception prompts in KToolbar?

pengongjie

What does the following exception prompt mean?


java.lang.NullPointerException
at chat.socket.Client.commandAction (+18)
at javax.microedition.lcdui.Display $ DisplayAccessor.commandAction (+282)
at javax.microedition.lcdui.Display $ DisplayManagerImpl.commandAction (+10)
at com.sun.midp.lcdui.DefaultEventHandler.commandEvent (+68)
at com.sun.midp.lcdui.AutomatedEventHandler.commandEvent (+47)
at com.sun.midp.lcdui.DefaultEventHandler $ QueuedEventHandler.run (+250)

lwj1020

The at part is the abnormal stack trace, I don't understand what is in the brackets

玉蝴蝶

Generally, you can just look at the first line.

conan609

In parentheses is the number of lines of code generated after Java compilation.