Caused by: java.lang.ClassNotFoundException: org.apache.commons.collections.Transformer异常
今天做了一个java对象转Map的例子，执行的时候报错了，如下：
Exceptioninthread"main"java.lang.NoClassDefFoundError:org/apache/commons/collections/Transformer
atjava.lang.ClassLoader.defineClass1(NativeMethod)
atjava.lang.ClassLoader.defineClass(ClassLoader.java:621)
atjava.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
atjava.net.URLClassLoader.defineClass(URLClassLoader.java:260)
atjava.net.URLClassLoader.access$000(URLClassLoader.java:56)
atjava.net.URLClassLoader$1.run(URLClassLoader.java:195)
atjava.security.AccessController.doPrivileged(NativeMethod)
atjava.net.URLClassLoader.findClass(URLClassLoader.java:188)
atjava.lang.ClassLoader.loadClass(ClassLoader.java:307)
atsun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
atjava.lang.ClassLoader.loadClass(ClassLoader.java:252)
atjava.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
atorg.apache.commons.beanutils.BeanMap.createTypeTransformers(BeanMap.java:132)
atorg.apache.commons.beanutils.BeanMap.(BeanMap.java:68)
atcom.example2.pojo.PojoToMap.objectToMap(PojoToMap.java:23)
atcom.example2.pojo.PojoToMap.main(PojoToMap.java:16)
Causedby:java.lang.ClassNotFoundException:org.apache.commons.collections.Transformer
atjava.net.URLClassLoader$1.run(URLClassLoader.java:200)
atjava.security.AccessController.doPrivileged(NativeMethod)
atjava.net.URLClassLoader.findClass(URLClassLoader.java:188)
atjava.lang.ClassLoader.loadClass(ClassLoader.java:307)
atsun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
atjava.lang.ClassLoader.loadClass(ClassLoader.java:252)
atjava.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
...16more
先贴上本例的主要代码吧：
packagecom.example2.pojo;
importjava.util.Map;
importjava.util.Set;
importorg.apache.commons.beanutils.BeanMap;
publicclassPojoToMap{
/**
*@paramargs
*/
publicstaticvoidmain(String[]args){
Employeeemployee=newEmployee();
employee.setName("张三");
employee.setAge(30);
Mapmap;
try{
map=objectToMap(employee);
Set>set=map.entrySet();
for(Map.Entryentry:set){
System.out.println(entry.getKey()+":"+entry.getValue());
}
}catch(Exceptione){
e.printStackTrace();
}
}
publicstaticMapobjectToMap(Objectobj){
if(obj==null)
returnnull;
returnnewBeanMap(obj);
}
}
Employee类：
packagecom.example2.pojo;
publicclassEmployee{
privateStringname;
privateIntegerage;
publicStringgetName(){
returnname;
}
publicvoidsetName(Stringname){
this.name=name;
}
publicIntegergetAge(){
returnage;
}
publicvoidsetAge(Integerage){
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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