非常简单的Apache-commons配置示例抛出NoClassDefFoundError [英] Very simple Apache-commons configuration example throws NoClassDefFoundError

问题描述

我正在尝试测试一个非常简单的例子在Apache-commons配置库用户指南中给出了关于声明和创建bean的信息。我几乎逐字地复制了示例中的代码，但是我得到了一个N​​oClassDefFoundError异常。

I'm trying to test a very simple example given in the Apache-commons configuration library user's guide regarding declaring and creating beans. I copied the code in the example almost word by word, and yet I'm getting a NoClassDefFoundError exception.

这是我正在使用的xml文件 - windowcongif.xml ：

Here is the xml file I'm using - windowcongif.xml:

<?xml version="1.0" encoding="ISO-8859-1" ?>
<config>
  <gui>
    <windowManager config-class="test.DefaultWindowManager"
      closable="false" resizable="true" defaultWidth="400"
      defaultHeight="250">      
    </windowManager>
  </gui>
</config>

这是文件中的代码 WindowManager.java ：

package test;
public interface WindowManager {}

这是文件中的代码 DefaultWindowManager.java ：

package test;
public class DefaultWindowManager  implements WindowManager {
    private boolean resizable;
    private boolean closable;
    private int defaultWidth;
    private int defaultHeight;
}

以下是文件 Main.java中的代码：

package test;
import org.apache.commons.configuration.ConfigurationException;
import org.apache.commons.configuration.XMLConfiguration;
import org.apache.commons.configuration.beanutils.BeanDeclaration;
import org.apache.commons.configuration.beanutils.BeanHelper;
import org.apache.commons.configuration.beanutils.XMLBeanDeclaration;

public class Main {
    public static void main(String[] args) throws ConfigurationException {
        XMLConfiguration config = new XMLConfiguration("windowconfig.xml");
        BeanDeclaration decl = new XMLBeanDeclaration(config, "gui.windowManager");
        WindowManager wm = (WindowManager) BeanHelper.createBean(decl);
    }
}

以下是运行时的输出：

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/beanutils/PropertyUtils
    at org.apache.commons.configuration.beanutils.BeanHelper.initProperty(BeanHelper.java:269)
    at org.apache.commons.configuration.beanutils.BeanHelper.initBeanProperties(BeanHelper.java:229)
    at org.apache.commons.configuration.beanutils.BeanHelper.initBean(BeanHelper.java:166)
    at org.apache.commons.configuration.beanutils.DefaultBeanFactory.initBeanInstance(DefaultBeanFactory.java:108)
    at org.apache.commons.configuration.beanutils.DefaultBeanFactory.createBean(DefaultBeanFactory.java:64)
    at org.apache.commons.configuration.beanutils.BeanHelper.createBean(BeanHelper.java:336)
    at org.apache.commons.configuration.beanutils.BeanHelper.createBean(BeanHelper.java:358)
    at org.apache.commons.configuration.beanutils.BeanHelper.createBean(BeanHelper.java:372)
    at test.Main.main(Main.java:23)
Caused by: java.lang.ClassNotFoundException: org.apache.commons.beanutils.PropertyUtils
    at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
    ... 9 more

如何让这个简单示例有效？

我使用的是commons-configuration软件包的1.9版本，在将依赖项放在 pom.xml 文件和版本1.7之后由IntelliJ IDEA自动导入在Windows 8 64bi上运行的java的.0_17 t。

I'm using version 1.9 of the commons-configuration package, auto-imported by IntelliJ IDEA after putting the dependency in the pom.xml file, and version 1.7.0_17 of java running on Windows 8 64bit.

推荐答案

导入 org.apache.commons.beanutils.PropertyUtils 在你班上。

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