今天做了一个java对象转Map的例子，执行的时候报错了，如下：

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/collections/Transformer
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
at java.net.URLClassLoader.access$000(URLClassLoader.java:56)
at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
at org.apache.commons.beanutils.BeanMap.createTypeTransformers(BeanMap.java:132)
at org.apache.commons.beanutils.BeanMap.<clinit>(BeanMap.java:68)
at com.example2.pojo.PojoToMap.objectToMap(PojoToMap.java:23)
at com.example2.pojo.PojoToMap.main(PojoToMap.java:16)
Caused by: java.lang.ClassNotFoundException: org.apache.commons.collections.Transformer
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
... 16 more

先贴上本例的主要代码吧：

package com.example2.pojo; import java.util.Map;import java.util.Set; import org.apache.commons.beanutils.BeanMap; public class PojoToMap { /** * @param args */ public static void main(String[] args) { Employee employee = new Employee(); employee.setName("张三"); employee.setAge(30); Map map; try { map = objectToMap(employee); Set<Map.Entry<String, Object>> set = map.entrySet(); for (Map.Entry<String, Object> entry : set) { System.out.println(entry.getKey() + " : " + entry.getValue()); } } catch (Exception e) { e.printStackTrace(); } } public static Map<?, ?> objectToMap(Object obj) { if (obj == null) return null; return new BeanMap(obj); }}

Employee类：

package com.example2.pojo; public class Employee { private String name; private Integer age; public String getName() { return name; } public void setName(String name) { this.name = name; } public Integer getAge() { return age; } public void setAge(Integer age) { this.age = age; }}

从报错信息上看，是缺少了org.apache.commons.collections.Transformer类，网上下载了commons-collections-3.2.1.jar包，引入后，重新执行，成功。

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