Please don’t suggest another Samplers, I really need JSR223, because the script there is much more complex, this is just an example.

I am using jMeter Java API to generate load tests in Kotlin. When I create a JSR223Sampler and add a Groovy script into it like

private fun getJSR223Sampler(): JSR223Sampler {
    val jsr223Sampler = JSR223Sampler()
    jsr223Sampler.setProperty(TestElement.TEST_CLASS, JSR223Sampler::class.java.name)
    jsr223Sampler.setProperty(TestElement.GUI_CLASS, TestBeanGUI::class.java.name)
    jsr223Sampler.name = "Trigger Minio help"
    jsr223Sampler.setProperty("scriptLanguage", "groovy")
    jsr223Sampler.setProperty("cacheKey", "true")
    jsr223Sampler.setProperty("filename", "")
    jsr223Sampler.setProperty("parameters", "")
    val script = """
        def minioHelp = "mc --help";
        def proc = minioHelp.execute();
    """.trimIndent()
    jsr223Sampler.setProperty("script", script)
    return jsr223Sampler
}

When I run this test based on this example

val jmeter = StandardJMeterEngine()
SaveService.saveTree(root, FileOutputStream("loadTest.jmx"))
jmeter.configure(root)
jmeter.run()

generated script inside has escaped quot marks

      <JSR223Sampler guiclass="TestBeanGUI" testclass="JSR223Sampler" testname="Trigger Minio help">
        <stringProp name="scriptLanguage">groovy</stringProp>
        <stringProp name="cacheKey">true</stringProp>
        <stringProp name="filename"></stringProp>
        <stringProp name="parameters"></stringProp>
        <stringProp name="script">def minioHelp = "mc --help";
        def proc = minioHelp.execute();</stringProp>
      </JSR223Sampler>

which lead into an error

"javax.script.ScriptException: java.io.IOException: Cannot run program ""mc"": error=2, No such file or directory"

How can I avoid this behaviour?
I have to say that when I import generated JMX file into jMeter, it works perfectly, so problem must be somewhere in jMeter engine used in Java?