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How do I understand the exception prompts in KToolbar?

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Post time: 2020-2-12 12:30:01
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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)
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Post time: 2020-5-30 12:00:01
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The at part is the abnormal stack trace, I don't understand what is in the brackets
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Post time: 2020-6-8 00:45:01
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Generally, you can just look at the first line.
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Post time: 2020-6-27 21:00:01
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In parentheses is the number of lines of code generated after Java compilation.
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