Hi,
I am trying to do some calculations with variables inside a loop
controller, but it looks like variables are reset to their initial
values each time the loop is executed.
What I am doing (Jmeter 2.3.1):
test plan
--thread group
----User defined variables (name: y, value 0)
----Loop Controller (loop count: 4)
------User defined variables (name: z, value ${__javaScript(${y}+1,y)} )
------Debug Sampler
------View Results Tree
according to the documentation the function ${__javaScript(${y}+1 ,
y)} adds 1 to the value of jmeter variable 'y' and stores the result
in jmeter variable y.
Indeed something like that seems to happen, because this is what I get
under tab "response data" for each of the 4 elements in the reponse
tree:
JMeterVariables:
START.YMD=20080502
JMeterThread.last_sample_ok=true
y=1
START.MS=1209764719713
z=1
START.HMS=234519
y=0
I was hoping to see y increase by 1 for every iteration through the
loop, but it remains stuck at a value of 1.
What is happening? What am I doing wrong? Why does variable 'y' seem
to be reinitialized when assigned to new user defined variable 'z'?
How can I use variables inside a loop that memorize values assigned in
previous iterations through the loop?
I looked at other ways of changing variables in loops such as the
counter pre processor, but for my metering purposes I need more
variables and I need to do more than just simple increments by fixed
amounts.
Then I found the BSF sampler, but there is at least an error in the
documentation:
at http://jakarta.apache.org/jmeter/usermanual/component_reference.html
where it is stated that responses should be returned through
SampleResponse.setSuccessful(true/false)
SampleResponse.setResponseCode("code")
SampleResponse.setResponseMessage("message")
but "SampleResponse" is not a known object to javascript in this context.
I figured out that instead SampleResponse
SampleResult.setSuccessful(true);
should be used.
resulting in the following setup:
test plan
--thread group
----User defined variables (name: y, value 0)
----Loop Controller (loop count: 4)
------BSF Sampler
------Debug Sampler
------View Results Tree
The BSF Sampler script is:
vars.put("y",${y}+1);
SampleResult.setSuccessful(true);
SampleResult.setResponseCode("200");
SampleResult.setResponseMessage("OK") ;
Now only the first iteration through the loop works reasonably well:
Result Tree response data:
BSF Sampler:
[EMAIL PROTECTED]
Debug Sampler:
JMeterVariables:
START.YMD=20080502
JMeterThread.last_sample_ok=true
START.MS=1209764719713
START.HMS=234519
y=1
However in the second and later iterations the BSF sampler fails and
jmeter.log contains the following messages:
WARN - jmeter.protocol.java.sampler.BSFSampler:
java.lang.RuntimeException: No Context associated with current Thread
at org.mozilla.javascript.Context.getContext(Context.java:2195)
at org.mozilla.javascript.ScriptRuntime.toObject(ScriptRuntime.java:834)
at org.mozilla.javascript.Context.toObject(Context.java:1572)
It looks like the required jmeter context passed to the javascript
interpreter got lost at the end of the first execution of the BSF
sampler?
Is there a working sample around that does some variable arithmetic
wile iterating through a control loop?
Thanks,
Anne
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