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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

awt, component, component, event, focusadapter, focusrequester, gui, jtextcomponent, non-nls-1, non-nls-1, numberfielderrorlistener, numberfielderrorlistener, numberformatexception, override, string, swing, text, textcomponent, textcomponent

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.gui.util;

import java.awt.Component;
import java.awt.TextComponent;
import java.awt.event.FocusAdapter;
import java.awt.event.FocusEvent;

import javax.swing.JOptionPane;
import javax.swing.text.JTextComponent;

import org.apache.jmeter.util.JMeterUtils;

public class NumberFieldErrorListener extends FocusAdapter {

    private static final NumberFieldErrorListener listener = new NumberFieldErrorListener();

    public static NumberFieldErrorListener getNumberFieldErrorListener() {
        return listener;

    public void focusLost(FocusEvent e) {
        Component source = (Component) e.getSource();
        String text = "";
        if (source instanceof JTextComponent) {
            text = ((JTextComponent) source).getText();
        } else if (source instanceof TextComponent) {
            text = ((TextComponent) source).getText();
        try {
        } catch (NumberFormatException nfe) {
                    JMeterUtils.getResString("you_must_enter_a_valid_number"), //$NON-NLS-1$
                    JMeterUtils.getResString("invalid_data"),  //$NON-NLS-1$
            new FocusRequester(source);

Other JMeter examples (source code examples)

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

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