Velocity check if Map has a key with null value

Question

I'm creating a velocity template to which I pass a map, and I want to get only the keys with values.

It is my code:

#set ($value = $map.get($key))
  #if($value != "")
    "$key": "$value",
  #end

• map.get(parameter) != null
• map.get(parameter) != ''

It prints: $value

Answer 1

Just try:

#if($value)
  "$key": "$value",
#end

It will filter out null and empty values.