sumFrom Enhancement about lambdaj HOT 1 CLOSED

About the 95% of time is spent by lambdaj introspecting the beans in order to 
gather
the values from their properties. That means that in your example the
personSum.getAge() invocation will be almost 4 times slower, making 
instantaneous the
following 3 invocations. 

This is not desirable because it is not said that you always need all the sums 
for
all the properties of your bean, so you don't want to waste time to compute 
values
you are not interested in.