No access to nested property in managed bean within p:columns

Question

I have following two simple POJOs:

class Person {
   String name
   Address address;
   //and of course the getter/setter for the attributes
}

class Address         


        

Answer 1

In addition to @BalusC answer I had to add a check for PrimeResourceHandler. Otherwise all resolvements of #{resource...} like #{resource['primefaces:spacer/dot_clear.gif']} inside the primefaces.css failed and the output stream of the parsed CSS file gets corrupted.

public class ExtendedBeanELResolver extends BeanELResolver {

    private static final String PRIMEFACES_RESOURCE_PREFIX = "primefaces:";

    @Override
    public Object getValue(ELContext context, Object base, Object property) throws NullPointerException,
            PropertyNotFoundException, ELException {
        if (property == null || base == null || base instanceof ResourceBundle || base instanceof Map
                || base instanceof Collection || base instanceof PrimeResourceHandler) {
            return null;
        }

        String propertyString = property.toString();

        if (!propertyString.startsWith(PRIMEFACES_RESOURCE_PREFIX) && propertyString.contains(".")) {
            Object value = base;

            for (String propertyPart : propertyString.split("\\.")) {
                value = super.getValue(context, value, propertyPart);
            }

            return value;
        } else {
            return super.getValue(context, base, property);
        }
    }
}

Answer 2

Nested bean properties in a brace notation string expression like #{person['address.city']} is by default not supported. You basically need a #{person['address']['city']}.

You need a custom ELResolver here. Easiest is to extend the existing BeanELResolver.

Here's a kickoff example:

public class ExtendedBeanELResolver extends BeanELResolver {

    @Override
    public Object getValue(ELContext context, Object base, Object property)
        throws NullPointerException, PropertyNotFoundException, ELException
    {
        if (property == null || base == null || base instanceof ResourceBundle || base instanceof Map || base instanceof Collection) {
            return null;
        }

        String propertyString = property.toString();

        if (propertyString.contains(".")) {
            Object value = base;

            for (String propertyPart : propertyString.split("\\.")) {
                value = super.getValue(context, value, propertyPart);
            }

            return value;
        }
        else {
            return super.getValue(context, base, property);
        }
    }

}

To get it to run, register it as follows in faces-config.xml:

<application>
    <el-resolver>com.example.ExtendedBeanELResolver</el-resolver>
</application>