CODEWITHSUNDEEP
springfreemarker
vect
vect

Reputation: 665

Representation of nulls in Freemarker with Spring Framework

I'm developing an application based on Spring Framerwork. As a view technology I use integrated with the framework Freemarker. Problems occur when java bean that stores data for vizualization have a null in some fields. There is no null conception in Freemarker so it considers that there is no these fields in the bean at all. I suppose problem could be solved by customization of class that copies data from the java bean to freemarker's hash object referred in template. But i haven't found what class does it in Spring. Is there such class and how is it called?

Upvotes: 3

Views: 852

Answers (3)

koljaTM
koljaTM

Reputation: 10262

If any part in your property chain can be null, you can also put parantheses around it to guard against any part being null. E.g. if you pu

${person.car.door.color!"<no value"}

you only guard against the color being null. But if it could also happen that the door, the car or the whole person is gone missing, you have to put

${(person.car.door.color)!"<no value"}

Upvotes: 1

ndeverge
ndeverge

Reputation: 21564

You can use the "!" operator. Here is an example :

${your_property!""}

It will print the empty string "" if your_property is null.

Upvotes: 1

cherouvim
cherouvim

Reputation: 31903

Usually you just deal with nulls directly in the template. E.g:

${person.surname!"n/a"}

which will print "n/a" in case of a null surname, or just:

${person.surname!}

which will print out the empty string (nothing) in case of a null surname.

Upvotes: 3

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