BeanUtils访问静态内部类属性问题

Question

BeanUtils(commons-beanutils-1.8.0)访问静态内部类属性访问不到，抛出的异常更加莫名其妙，非静态内部类完全没问题，不知道这是不是BeanUtils的Bug，哪位仁兄能解释下，下面是测试代码

@Test
	public void  testBeanUtils() throws IllegalAccessException, InvocationTargetException, NoSuchMethodException{
		
		User user = new User() ;
		
		user.setUsername("wenzuojing");
		
		String value = BeanUtils.getProperty(user, "username") ;
		
		Assert.assertEquals(value, "wenzuojing");
	}
	
	static class User{
		private String username ;

		public String getUsername() {
			return username;
		}

		public void setUsername(String username) {
			this.username = username;
		}
		
		
	}

抛出异常

java.lang.NoSuchMethodException: Property 'username' has no getter method in class 'class org.wzj.htmlunit.TestMain$User'
	at org.apache.commons.beanutils.PropertyUtilsBean.getSimpleProperty(PropertyUtilsBean.java:1318)
	at org.apache.commons.beanutils.PropertyUtilsBean.getNestedProperty(PropertyUtilsBean.java:762)
	at org.apache.commons.beanutils.BeanUtilsBean.getNestedProperty(BeanUtilsBean.java:715)
	at org.apache.commons.beanutils.BeanUtilsBean.getProperty(BeanUtilsBean.java:741)
	at org.apache.commons.beanutils.BeanUtils.getProperty(BeanUtils.java:382)
	at org.wzj.htmlunit.TestMain.testBeanUtils(TestMain.java:32)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:601)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

Answer 1

现在回复有点晚了吧, 哈哈 

你给内部类User加个public就可以了

Answer 2

使用BeanUtils工具包去操作类中的方法，这个被操作的类必须是public修饰的类。你定义的class不是被public修饰的，所以报错。你试试把User这个类另外定义在一个文件中试试就可以了。我也是今天遇到这个问题查了资料才知道的。希望能帮到你。