(This article is part of the JMeter Series)
Useful ways to debug JMeter as far as I know:
- insert a “Debug Sampler”
the “Debug Sampler” will emit “everything that’s known” to JMeter. That output can be displayed in the “View Results Tree Listener”:
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have a look at the JMeter log file (which is usually dumped from where you’ve started JMeter)
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check the output of one of the listeners such as the “View Results Tree Listener”.
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if you need to debug regexes of a “Regular Expression Extractor” then you can have a look at the source code of the page you want to extract a value from inside the “View Results Tree Llistener” and enter the same regular expression in the “Search” field (searching is only implemented in JMeter > v2.4).
In that picture you can see JMeter matching and displaying the regex entered in the search field inside an HTML page retrieved though the “HTTP Client Sampler”.
Tomáš Pospíšek, 1.1.2011