B4J Question Program crashes are logged,where?

[HARRY]

Hi,
I have made a server program ( so non_UI), that runs very well for a couple of days and then crashes. Using systemd it is restarted and the program is written such that no data is lost, but still I would like to know why it crashes. I cannot find in what log file the reason of the crash is reported, such as division by zero, index out of range, impossible conversion, etc.
The programs runs on a Raspberry with raspbian installed.
Please, some help!
Harry

 

[jmon]

you should use the Application_Error Sub to catch your error and stackTrace and write it to a file:

'Return true to allow the default exceptions handler to handle the uncaught exception.
Sub Application_Error (Error As Exception, StackTrace As String) As Boolean
    Log(Error)
    'write your error to file here
    Return True
End Sub

 

[jmon]

You can also redirect the stdErr to a file:
https://www.b4x.com/android/forum/threads/redirect-the-output-to-a-file.65165/

 

[Erel]

If you are running it on Linux then you should use nohup. It will prevent the process from being killed when the user logs out and it will redirect the output to a file.

 

[billzhan]

It is possible that the server app is kill by Linux Out-of-Memory killer(Linux OS OOM killer). OOM killer is expected when low memory is available for OS.

You need to check files in /var/log/, this article describes in detail.