Most likely your applications returned pages with HTTP 200 (OK) as a
return code and not HTTP 500 (Internal Server Error) or something similar.
If you don't add any additional assertions (positive or negative), JMeter
will interpret HTTP 200 as a correct result.

There is no intelligence in JMeter, only what you explicitly add to it.

Mark

> Dear All .
>
> Greetings ,
>
> I just run a simple test plan which has a Login page load and an ajax.do
> . I have run this test plan with 500 Concurrent users . I didn't get any
> error ( Error % ) in Aggregate graph , But while monitoring the tomcat
> server , I got the following error few times repeatedly as
>
> " Cannot open Connections
>   Caused by: java.sql.SQLException: Io exception: End of TNS data channel
> " .
>
> Why the JMeter didn't catch these error on aggregate graph ??  pls Explain
> asap .
>
> Thanking You
> With warm regards,
> Vijayakumar.C


-- 
Mark Rotteveel
Pluton IT


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