无法使用 PostProcessor 在 JMeter 中解码 jwt 令牌

Question

I am new to JMeter.I want to perfrom some load testing on one of my application. I want to decode JWT token and from there need to get Session id and it has to be appended to JMeter variable.

Below is my code

import com.auth0.jwt.*

log.info("Hello")
def jwt = JWT.decode(vars.get('idToken'))
log.info(jwt)

vars.put('sessionId', jwt.getClaim('sessionId').asString())
log.info(jwt.getClaim('sessionId').asString())

It is producing some errors while executing this code

Below is the exception message

javax.script.ScriptException: groovy.lang.MissingPropertyException: No such property: JWT for class: Script11
    at org.codehaus.groovy.jsr223.GroovyScriptEngineImpl.eval(GroovyScriptEngineImpl.java:320) ~[groovy-jsr223-3.0.7.jar:3.0.7]
    at org.codehaus.groovy.jsr223.GroovyCompiledScript.eval(GroovyCompiledScript.java:71) ~[groovy-jsr223-3.0.7.jar:3.0.7]
    at javax.script.CompiledScript.eval(CompiledScript.java:93) ~[java.scripting:?]
    at org.apache.jmeter.util.JSR223TestElement.processFileOrScript(JSR223TestElement.java:217) ~[ApacheJMeter_core.jar:5.4.1]
    at org.apache.jmeter.extractor.JSR223PostProcessor.process(JSR223PostProcessor.java:45) [ApacheJMeter_components.jar:5.4.1]
    at org.apache.jmeter.threads.JMeterThread.runPostProcessors(JMeterThread.java:955) [ApacheJMeter_core.jar:5.4.1]
    at org.apache.jmeter.threads.JMeterThread.executeSamplePackage(JMeterThread.java:573) [ApacheJMeter_core.jar:5.4.1]
    at org.apache.jmeter.threads.JMeterThread.processSampler(JMeterThread.java:489) [ApacheJMeter_core.jar:5.4.1]
    at org.apache.jmeter.threads.JMeterThread.run(JMeterThread.java:256) [ApacheJMeter_core.jar:5.4.1]
    at java.lang.Thread.run(Thread.java:831) [?:?]

Need suggestion to resolve this issue.

JMeter Version : 5.4

Answer 1

You need to have java-jwt-x.xx.x.jar along with its dependencies inJMeter Classpath before running the script.

For the latest stable version 3.18.1 you will need the following .jars:

• jackson-annotations-2.11.0.jar
• jackson-core-2.11.0.jar
• jackson-databind-2.11.0.jar
• java-jwt-3.18.1.jar

If you do have them in JMeter Classpath already you will have to restart JMeter to pick the libraries up

Once done you should be able to use the code you copied and pasted from somewhere:

Demo using JWT token eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c from https://jwt.io/ web page:

More information on Groovy scripting in JMeter: Apache Groovy - Why and How You Should Use It