public final Long getLong(CompoundName name) {
        return getLong(name, null);
    }
Returns a property as a Long.

@return the long value of the name, or null if the property is null
@throws NumberFormatException if the given parameter exists but have a value which
                              is not parseable as a number
container-core/src/main/java/com/yahoo/processing/request/Properties.java