B4J Question How to log when runtimeexception occurs

[HARRY]

In my program data is received via WiFi. This data is analyzed. Occasionaly a runtimexception occurs ( once per week). The exception then is StringIndexOutOfBound. I want to write the data to the logfile to investigate it, only when this error occurs. I use already RedirectOutput, so I get a complete java reporting on the error.
What should I do to see the data causing this error?
Harry

 

[stevel05]

Put the code in a try - catch block and log the lastexception

try
    Code likely to fail
Catch
    Log(Data)
    Log(LastException)
End Try