Jmeter - saving the result using file name - jmeter

Question

I need to append the summary result into CSV file, I tried but getting below error
2022-08-04 12:21:25,553 WARN o.a.j.s.CSVSaveService: Unknown column name
2022-08-04 12:21:25,553 INFO o.a.j.s.CSVSaveService: C:\Users\Premkumar\Desktop\onescv.csv does not appear to have a valid header. Using default configuration.
2022-08-04 12:21:25,553 WARN o.a.j.s.CSVSaveService: Cannot parse timestamp: '', will try following formats [yyyy/MM/dd HH:mm:ss.SSS, yyyy/MM/dd HH:mm:ss, yyyy-MM-dd HH:mm:ss.SSS, yyyy-MM-dd HH:mm:ss, MM/dd/yy HH:mm:ss]
2022-08-04 12:21:25,553 INFO o.a.j.s.CSVSaveService: did not match yyyy/MM/dd HH:mm:ss.SSS, trying next date format
2022-08-04 12:21:25,553 INFO o.a.j.s.CSVSaveService: did not match yyyy/MM/dd HH:mm:ss, trying next date format
2022-08-04 12:21:25,553 INFO o.a.j.s.CSVSaveService: did not match yyyy-MM-dd HH:mm:ss.SSS, trying next date format
2022-08-04 12:21:25,553 INFO o.a.j.s.CSVSaveService: did not match yyyy-MM-dd HH:mm:ss, trying next date format
2022-08-04 12:21:25,553 INFO o.a.j.s.CSVSaveService: did not match MM/dd/yy HH:mm:ss, trying next date format
2022-08-04 12:21:25,553 WARN o.a.j.s.CSVSaveService: Error parsing field 'timeStamp' at line 1. java.text.ParseException: No date-time format found matching
I have tried by changing the date formats in Jmeter properties also as below;
# Timestamp format - this only affects CSV output files
# legitimate values: none, ms, or a format suitable for SimpleDateFormat
#jmeter.save.saveservice.timestamp_format=ms
#jmeter.save.saveservice.timestamp_format=yyyy/MM/dd HH:mm:ss.SSS
If any suggestion plsenter code here

Answer 1

JMeter's .jtl files have the defined format like:
timeStamp,elapsed,label,responseCode,responseMessage,threadName,dataType,success,failureMessage,bytes,sentBytes,grpThreads,allThreads,URL,Latency,IdleTime,Connect
1659509834675,57,Your-Sampler-Label,200,OK,Thread Group 1-6,text,true,,114,0,12,12,null,25,0,3
When you use Save Table Data button in the Summary Report listener the first 2 lines look like:
Label,# Samples,Average,Min,Max,Std. Dev.,Error %,Throughput,Received KB/sec,Sent KB/sec,Avg. Bytes
Your-Sampler-Label,42,282,53,490,132.23,0.000%,32.25806,3.59,0.00,114.0
JMeter is looking for a Unix timestamp like 1659509834675 and it gets Your-Sampler-Label instead which is causing the failure.
So there is no way to add the Summary Report data to the .jtl results file without breaking Listeners and HTML Reporting Dashboard generation, if you want to have Summary Report listener output as CSV you can use JMeter Plugins Command Line Tool as:
JMeterPluginsCMD.bat --generate-csv summary-report.csv --input-jtl /path/to/your/test/result.jtl --plugin-type SynthesisReport
This way you will have the Summary Report listener as a separate file.