使用反射将字段值设置为null

Question

我将变量值设置为null,但有问题:

public class BestObject {
    private Timestamp deliveryDate;
    public void setDeliveryDate(Timestamp deliveryDate) {
         this.deliveryDate = deliveryDate;
    }
}

BeanUtils.setProperty(new BestObject(), "deliveryDate", null); // usually the values are not hardcoded, they come from configuration etc

这是错误:

org.apache.commons.beanutils.ConversionException: No value specified
    at org.apache.commons.beanutils.converters.SqlTimestampConverter.convert(SqlTimestampConverter.java:148)
    at org.apache.commons.beanutils.ConvertUtils.convert(ConvertUtils.java:379)
    at org.apache.commons.beanutils.BeanUtils.setProperty(BeanUtils.java:999)

基本上它试图将java.sql.Timestamp值设置为null,但由于某种原因它不起作用.

另一方面,我使用反射包装器BeanUtils(http://commons.apache.org/proper/commons-beanutils/),也许这可以用简单的反射？

Answer 1

我设法用标准反射做到了.

java.lang.reflect.Field prop = object.getClass().getDeclaredField("deliveryDate");
prop.setAccessible(true);
prop.set(object, null);