title: Jmeter+Jruby-JSR223 sample Request+jmeter properties are not assigned for more than 4 threads
body: <p>I have setup ant JMeter task  which gives JMeter request with already assigned 3 properties to JMeter test plan (JMX) ,</p>
  
  <p>I was reading these properties in Jruby script(JSR223 sampler) like below (for upto first 4 threads it is getting all 3 property values correctly and assigning to localvariables (pvalue1mpvalue2)..</p>
  
  <pre><code>pvalue1=$props.get("prop1")
  pvalue2=$props.get("prop2")
  pvalue3=$props.get("prop3")
  </code></pre>
  
  <p>But problem is that from thread no 5, it is started throwing below exception </p>
  
  <pre><code> [jmeter] Jruby Exception is     undefined method `get' for nil:NilClass
   [jmeter] Jruby backtrace is   ["&lt;script&gt;:157:in `(root)'"]
  </code></pre>
  
  <p>I have java_import like this in my jruby...</p>
  
  <pre><code>java_import 'java.util.Properties'
  </code></pre>