JMeter: Extracting and passing Transaction controller name in JMeter test plan - jmeter

Question

In my JMeter test plan, i have 3 transaction controllers.
I want to extract the transaction controller name and pass it to the Jmeter script.
I am unable to extract the transaction controller name, which is displayed into "Log viewer Panel".
To print transaction name , i have used BeanShell Listener, with following code :
String tname= sampleResult.toString();
if(tname.startsWith("T01_Login"))
{
log.info("*Transaction Name = " +sampleResult.toString() + " - Response time = " + sampleResult.getTime());
String temp = sampleResult.toString();
String temp2 = sampleResult.getTime().toString();
vars.put("Transaction_Name",temp);
vars.put("Response", temp2);
log.info(vars.get("Response"));
log.info(vars.get("Transaction_Name"));
}
I have used BSF post processor to store/extract the transaction name, by using following code:
Language selected in : Javascript
var transact = ${Transaction_Name};
vars.put ("TRANSACT",transact);
log.info(TRANSACT);
When checked into LogViewer panel, following text is displayed:
2017/03/27 17:06:13 INFO - jmeter.util.BeanShellTestElement: *Transaction Name = T01_Login - Response time = 39829
2017/03/27 17:06:13 INFO - jmeter.util.BeanShellTestElement: 39829
2017/03/27 17:06:13 INFO - jmeter.util.BeanShellTestElement: T01_Login
Kindly provide your valuable suggestion on this.

Answer 1

To resolve the error which prevents post-processor from running, use vars.get, instead of var transact = ${Transaction_Name};, i.e.
var transact = vars.get("Transaction_Name");
And setting another variable (vars.put ("TRANSACT",transact);) is unnecessary: just use Transaction_Name. (And another small note: BSF set of objects is now deprecated, so switch them to either JSR322 or BeanShell)
But it will not work anyways, because the order of execution is
Sampler > Post-processor > Listener > Transaction Controller > Listener
So the value of Transaction_Name inside post-processor will either be empty (on first iteration), or will be coming from previous iteration, which I guess is not what you want.
You don't mention your use case, but some options you have are:
Have a special sampler AFTER transaction controller to do what you wanted in that post-processor. For example:
Transaction Controller
Some Sampler
...
JSR223 / Beanshell sampler
This second sampler can obtain proper transaction name, since it's running after the transaction
Save transaction name into variable before calling a transaction. Set transaction controller name to that variable:
JSR223 / Beanshell sampler
sets variable: vars.put("Transaction_Name", "T01_Login");
${Transaction_Name} <-- this is the name of the transaction controller
Sampler
Post-processor <-- here the Transaction_Name can be obtained.