StringIndexOutOfBoundsException in JMeter request

Question

Why im getting this exception in POST request?

I'm trying to login with JMeter, but no matter i do it won't work. I have Cookie Manager HC4CookieHandler/standard, Regular Expression Extractor too jsfViewState/name="javax.faces.ViewState" id="javax.faces.ViewState" value="(.+?)" checked Main and sub-samples/Body.

But still in POST login i'm getting this.

What i'm missing? Is it in regular expression value? javax.facesViewState has value "-2918962836342094824:7411539759421041608", but doesn't range "(.+?)" should catch it?

Answer 1

Looking into your request details it appears that you're sending ${jsfViewstate} instead of the numeric value so your Regular Expression Extractor doesn't seem to be capturing it from the response for some reason. The reasons could be in:

1. Parent sampler doesn't contain the javax.faces.ViewState input, it comes in sub-samples. In that case you will need to switch Regular Expression Extractor scope to "Main sample and sub-samples"
2. Response markup assumes that "ViewState" input is broken into 2 lines so your single-line regular expression cannot match it.

Some suggestions:

• You can use Debug Sampler and View Results Tree listener combination to see JMeter Variables values

• You can use "RegExp Tester" mode of the View Results Tree listener to test your regular expression against live response

  See How to Debug your Apache JMeter Script guide for hints on getting to the bottom of JMeter script issues.

---

You can consider using XPath Extractor as an alternative.

1. Add XPath Extractor as a child of the first request
2. Configure it as follows:
   • Apply to: Main sample and sub-samples
   • Check Use Tidy
   • Reference Name: anything meaningful, i.e. jsfViewState
   • XPath query: //input[@id='javax.faces.ViewState']/@value
3. Disable (or delete) your Regular Expression Extractor
4. Refer extracted value as ${jsfViewState} where required

XPath Extractor Configuration:

Demo: