Created attachment 36131 [details]
SetCalcMode Should be 3, but is 0. Same with SetThroughput, should be 20

When implementing ConstantThroughputTimer from java code, it's properties "throughput" and "mode" are not correctly setted up.

While I do:

  ConstantThroughputTimer constThroughputTimer = new ConstantThroughputTimer();
  constThroughputTimer.setName("consttimer");
  constThroughputTimer.setProperty(TestElement.TEST_CLASS, ConstantThroughputTimer.class.getName());
  constThroughputTimer.setProperty(TestElement.GUI_CLASS, TestBeanGUI.getName());
  constThroughputTimer.setEnabled(true);

  constThroughputTimer.setThroughput(samplesPerMinute);
  constThroughputTimer.setCalcMode(3);

// with samplesPerMinute = 20

But when I save TreePlan, those 2 props are not present:

  </hashTree>
      <ConstantThroughputTimer testclass="ConstantThroughputTimer" testname="Constant Throughput Timer" enabled="true"/>
  <hashTree/>

And when executed with:

  StandardJMeterEngine jMeterEngineStd = jmeterPlan.getJMeterEngineStd();
  jMeterEngineStd.configure(jmeterPlan.getPlanTree());
  jMeterEngineStd.run(); 

It never finishes. Debuging from 
  jMeterEngineStd.run() 
there's a moment when 
  invokeOrBailOut is call (in TestBeanHelper.java)
when called for method setCalcMode, value should be 3, but it is 0

And similiar thing happen with method
  setThroughput
when value should be 20, but ti is 0.0



Inspecting code, I found differences in how ConstantThroughputTimer set property values, compare to other timers like ConstantTimer.

In ConstantThroughputTimer (https://github.com/apache/jmeter/blob/trunk/src/components/org/apache/jmeter/timers/ConstantThroughputTimer.java)

lines 118
  public void setThroughput(double throughput) {
        this.throughput = throughput;
  }

and 135
  public void setCalcMode(int mode) {
        this.mode = Mode.values()[mode];
  }

While in ConstantTimer (https://github.com/apache/jmeter/blob/trunk/src/components/org/apache/jmeter/timers/ConstantTimer.java)

line 51
  public void setDelay(String delay) {
        setProperty(DELAY, delay);
  }


So I tryextending ConstantThroughputTimer:

  @GUIMenuSortOrder(4)
  public class ConstantThroughputTimerBugSolution extends ConstantThroughputTimer {

	private static final long serialVersionUID = 4;

	/** Key for storing assertion-information in the jmx-file. */
	public static final String THROUGHPUT_KEY = "throughput"; // $NON-NLS-1$
	public static final String CALC_MODE_KEY = "calcMode"; // $NON-NLS-1$

	@Override
	public void setThroughput(double throughput) {
		super.setThroughput(throughput); // just in case
		setProperty(new DoubleProperty(THROUGHPUT_KEY, throughput));
	}

	@Override
	public void setCalcMode(int mode) {
		super.setCalcMode(mode); // just in case
		setProperty(CALC_MODE_KEY, mode);
	}
  }


And it works just fine. Mode and Throughput have proper values, and even more, it is correctly setted up in TestPlan:

  </hashTree>
   <ConstantThroughputTimerBugSolution testclass="ConstantThroughputTimer" testname="Constant Throughput Timer" enabled="true">
      <doubleProp>
         <name>throughput</name>
         <value>Infinity</value>
         <savedValue>0.0</savedValue>
      </doubleProp>
      <intProp name="calcMode">3</intProp>
   </ConstantThroughputTimerBugSolution>
  <hashTree/>



Exactly same problem I found with CompareAssertion, and same kind of resolve. And I saw many clases with same of property settings

Hope this help