Apache http库NoClassDefFoundError

Question

我一直在阅读有关此错误的内容，而且我无法查看出错的地方。我将org.apache.httpcomponents.httpclient_4.5.2.jar添加到项目库，运行库和编译库中。

这是我的源代码：

    public void HttpFunction()
{
    try
    {
        String url = "http://www.google.com";
        CloseableHttpClient client = HttpClients.createDefault();
        HttpGet web_target = new HttpGet(url);
        ResponseHandler<String> response_handler = new BasicResponseHandler();
        String web_response = client.execute(web_target, response_handler);
        System.out.println(web_response);
        client.close();
    }
    catch (Exception no)
    {
        System.out.println("ERROR: " + no);
    }
}

我确实拥有所有必需的导入，并且可以识别它们。这是它创建的巨大错误列表：

java.lang.NoClassDefFoundError: org/apache/http/HttpRequest
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2615)
at java.lang.Class.getMethod0(Class.java:2856)
at java.lang.Class.getMethod(Class.java:1668)
at sun.launcher.LauncherHelper.getMainMethod(LauncherHelper.java:494)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:486)
Caused by: java.lang.ClassNotFoundException: org.apache.http.HttpRequest
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
... 18 more
Exception in thread "main" C:\Users\JOE_LAPTOP\AppData\Local\NetBeans\Cache\8.1\executor-snippets\run.xml:53: Java returned: 1

BUILD FAILED（总时间：0秒）

经过数天的研究和反复试验，我完全迷失了。请帮忙。