JMeter Scripts - Clear a value in a Custom Property or Set it to null

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I have a JMeter script, and I need to clear a value of a Property (or set it to null). I tried the following:

props.put("MY_CUSTOM_PROPERTY", null);

This gives me a NullPointerException. Sample Stacktrace is given below.

javax.script.ScriptException: javax.script.ScriptException: java.lang.NullPointerException
    at org.codehaus.groovy.jsr223.GroovyScriptEngineImpl.eval(GroovyScriptEngineImpl.java:158) ~[groovy-jsr223-3.0.3.jar:3.0.3]
    at javax.script.AbstractScriptEngine.eval(AbstractScriptEngine.java:233) ~[java.scripting:?]
    at org.apache.jmeter.util.JSR223TestElement.processFileOrScript(JSR223TestElement.java:224) ~[ApacheJMeter_core.jar:5.3]
    at org.apache.jmeter.modifiers.JSR223PreProcessor.process(JSR223PreProcessor.java:45) [ApacheJMeter_components.jar:5.3]
    at org.apache.jmeter.threads.JMeterThread.runPreProcessors(JMeterThread.java:950) [ApacheJMeter_core.jar:5.3]
    at org.apache.jmeter.threads.JMeterThread.executeSamplePackage(JMeterThread.java:549) [ApacheJMeter_core.jar:5.3]
    at org.apache.jmeter.threads.JMeterThread.processSampler(JMeterThread.java:489) [ApacheJMeter_core.jar:5.3]
    at org.apache.jmeter.threads.JMeterThread.run(JMeterThread.java:256) [ApacheJMeter_core.jar:5.3]
    at java.lang.Thread.run(Thread.java:830) [?:?]

Could someone help me clear the value in only one specific property?

Please see:

  • I know I can use props.clear() to clear all properties to null.
  • My JMeter version: 5.3
  • Groovy version: 3.0.3
jmeter groovy
2 Answers

You can't add null values, just use remove:

props.remove("MY_CUSTOM_PROPERTY");
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