Freemarker Handling Null values

Freemarker How to handle null values using an exclamation point to handle null values

Example: ${user.group! " Null "}, if the user does not have the value of the group attribute, then it will output a" null value. "

Again for example: ${user.group.name! " Null "}, so the use is not possible, still will be error, because Freemarker only will judge Group.name is not a null value

Workaround: So we should write ${(user.group.name)! " Null "}, enclosed in parentheses, will determine if each of them is null (continuous judgment)

Using the If label and?? To judge

For example:

< #if (A.B)?? > Not empty <#/if>

The IF condition is true only if the A.B exists and is not NULL. "Not Empty" is displayed.

Freemarker Handling Null values