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JMeter example source code file (

This example JMeter source code file ( is included in the "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - JMeter tags/keywords

genericcontroller, io, loopcontroller, loopiterationlistener, loopiterationlistener, nextisnullexception, nextisnullexception, onceonlycontroller, onceonlycontroller, override, sampler, serializable, serializable

The JMeter source code

 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.

package org.apache.jmeter.control;


import org.apache.jmeter.engine.event.LoopIterationEvent;
import org.apache.jmeter.engine.event.LoopIterationListener;
import org.apache.jmeter.samplers.Sampler;

 * Controller to run its children once per cycle.
public class OnceOnlyController extends GenericController implements Serializable, LoopIterationListener {

    private static final long serialVersionUID = 240L;

     * Constructor for the OnceOnlyController object.
    public OnceOnlyController() {

     * @see LoopIterationListener#iterationStart(LoopIterationEvent)
    public void iterationStart(LoopIterationEvent event) {
        int numIteration = 1;
        // Bug 39509: iteration to 0 for all controller which not LoopController (and TG)
        if (!(event.getSource() instanceof LoopController)) {
            numIteration = 0;
        if (event.getIteration() == numIteration) {

    protected Sampler nextIsNull() throws NextIsNullException {
        return null;

Other JMeter examples (source code examples)

Here is a short list of links related to this JMeter source code file:

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