I'm attempting to use BeanUtils to interact with a Java bean similar to the following:
public class Bean {
private List<Integer> prices = new LinkedList<Integer>();
public List<Integer> getPrices() {
return prices;
}
}
According to the BeanUtils documentation, BeanUtils does support indexed properties that are List
s:
As an extension to the JavaBeans specification, the BeanUtils package considers any property whose underlying data type is java.util.List (or an implementation of List) to be indexed as well.
However, let's say I try to do something like the following:
Bean bean = new Bean();
// Add nulls to make the list the correct size
bean.getPrices().add(null);
bean.getPrices().add(null);
BeanUtils.setProperty(bean, "prices[0]", 123);
PropertyUtils.setProperty(bean, "prices[1]", 456);
System.out.println("prices[0] = " + BeanUtils.getProperty(bean, "prices[0]"));
System.out.println("prices[1] = " + BeanUtils.getProperty(bean, "prices[1]"));
The output is:
prices[0] = null
prices[1] = 456
Why is BeanUtils.setProperty()
unable to set the indexed property, while PropertyUtils.setProperty()
can? Does BeanUtils not support type conversion for objects inside List
s?
BeanUtils
requires a setter method for it to work. Your Bean
class is missing the setter method for prices
, add this and rerun your code, it should work fine:-
public void setPrices(List<Integer> prices) {
this.prices = prices;
}
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