BeanUtils.copyProperties使用异常

最新推荐文章于 2025-11-03 22:00:56 发布

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本文详细解析了在使用BeanUtils.copyProperties进行对象属性复制时遇到的日期转换异常问题，提供了具体的解决方案，包括注册日期转换器的方法，并附有修改前后的代码对比。

环境
异常
原因
解决

环境

rabbitmq使用，传输对象与本地对象转换赋值；BeanUtils.copyProperties只有属性(类型、名)一致才能赋值

public static Classes pt2Classes(ClassesPT classesPT) {
		Classes classes = new Classes();
		try {
			BeanUtils.copyProperties(classes, classesPT);
			// 不加判断，报空指针异常
			if (null != classesPT.getClassId()) {
				classes.setClassId(classesPT.getClassId().toString());
			}
			if (null != classesPT.getLineTypeid()) {
				classes.setLineTypeid(classesPT.getLineTypeid().intValue());
			}
		} catch (IllegalAccessException | InvocationTargetException e) {
			e.printStackTrace();
		}
		return classes;
	}

异常

org.apache.commons.beanutils.ConversionException: No value specified for 'Date'
	at org.apache.commons.beanutils.converters.AbstractConverter.handleMissing(AbstractConverter.java:310)
	at org.apache.commons.beanutils.converters.AbstractConverter.convert(AbstractConverter.java:136)
	at org.apache.commons.beanutils.converters.ConverterFacade.convert(ConverterFacade.java:60)
	at org.apache.commons.beanutils.BeanUtilsBean.convert(BeanUtilsBean.java:1078)
	at org.apache.commons.beanutils.BeanUtilsBean.copyProperty(BeanUtilsBean.java:437)
	at org.apache.commons.beanutils.BeanUtilsBean.copyProperties(BeanUtilsBean.java:286)
	at org.apache.commons.beanutils.BeanUtils.copyProperties(BeanUtils.java:137)
	at cn.iot.utils.BeanCopy.pt2Classes(BeanCopy.java:90)
	at cn.iot.filter.ClassConsumer.onMessage(ClassConsumer.java:41)
	at org.springframework.amqp.rabbit.listener.adapter.MessageListenerAdapter.onMessage(MessageListenerAdapter.java:273)
	at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.doInvokeListener(AbstractMessageListenerContainer.java:1569)
	at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.actualInvokeListener(AbstractMessageListenerContainer.java:1488)
	at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.invokeListener(AbstractMessageListenerContainer.java:1476)
	at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.doExecuteListener(AbstractMessageListenerContainer.java:1467)
	at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.executeListener(AbstractMessageListenerContainer.java:1411)
	at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.doReceiveAndExecute(SimpleMessageListenerContainer.java:958)
	at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.receiveAndExecute(SimpleMessageListenerContainer.java:908)
	at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.access$1600(SimpleMessageListenerContainer.java:81)
	at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer$AsyncMessageProcessingConsumer.mainLoop(SimpleMessageListenerContainer.java:1279)
	at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer$AsyncMessageProcessingConsumer.run(SimpleMessageListenerContainer.java:1185)
	at java.lang.Thread.run(Thread.java:745)

原因

Date转换器没有注册到默认值，根据异常，查看报错点代码。

解决

ConvertUtils.register(new DateConverter(null), java.util.Date.class);
BeanUtils.copyProperties(classes, classesPT);

或

// 静态代码块
static{
	ConvertUtils.register(new DateConverter(null),java.util.Date.class);
	ConvertUtils.register(new SqlDateConverter(null), java.sql.Date.class);
}

改后代码

public static Classes pt2Classes(ClassesPT classesPT) {
	Classes classes = new Classes();
	try {
		// 添加不报异常
		ConvertUtils.register(new DateConverter(null), java.util.Date.class);
		BeanUtils.copyProperties(classes, classesPT);
		// 不加判断，报空指针异常
		if (null != classesPT.getClassId()) {
			classes.setClassId(classesPT.getClassId().toString());
		}
		if (null != classesPT.getLineTypeid()) {
			classes.setLineTypeid(classesPT.getLineTypeid().intValue());
		}
	} catch (IllegalAccessException | InvocationTargetException e) {
		e.printStackTrace();
		return classes;
	}
	return classes;
}

源码异常点可看