How to record a JNLP/ Java Web Start application with JMeter

I need to do a performance test for JNLP accessible application.

I used WireShark and see that the jnlp generates only TCP traffic.

I read all the post related with jnlp perf testing and I tried with Apache JMeter + UbikLoadPack Java Serialization plugin but jmeter does not capture the traffic.

Is it my only option capture the TCP traffic and work with that ?

Regards, Jaime

If traffic is HTTP(s), as per documentation of UbikLoadPack bundle, You need to follow the instructions of paragraphs:

1/Add JMeter certificate authority to the cacerts file used by Java:

See in documentation "Configuring Application for HTTPS" (Pages 7/8). This will allow your application to work when using JMeter as proxy if traffic is HTTPS

Steps are the following:

Start JMeter
Use File > Templates... Menu item, then select "Recording" Template and click Create
Start HTTP(S) Test Script Recorder by clicking on Start Button
JMeter will generate a Certificate Authority in 2 formats in jmeter/bin folder:
- ApacheJMeterTemporaryRootCA.crt
- ApacheJMeterTemporaryRootCA.usr
Find cacerts file used by your system, it should be in JAVA_HOME/jre/lib/security/cacerts
Run:

keytool -keystore cacerts -importcert -alias jmeter_ca -file <path to jmeter>/bin/ApacheJMeterTemporaryRootCA.crt

keystore password is usually "changeit"
enter "yes" for "Trust this certificate?" question

References:

2/To set JMeter as proxy of JNLP:

Open the Java Control Panel

Click Network Settings. The Network Settings dialog box opens.
Select Use proxy server, enter the proxy server name (localhost), and port number (8888 for JMeter).