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How to handle null values in Freemarker? I get some exceptions in the template when null values are present in data.
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eval. This built-in evaluates a string as an FTL expression. For example "1+2"? eval returns the number 3. (To render a template that's stored in a string, use the interpret built-in instead.)
When applied to a boolean, the string built-in will act as a ternary operator. It's no very readable as this is not the intended usage of it. It's for formatting boolean values, like Registered: ${registered? string('yes', 'no')} .
Comments: <#-- and --> Comments are similar to HTML comments, but they are delimited by <#-- and -->. Comments will be ignored by FreeMarker, and will not be written to the output.
Starting from freemarker 2.3.7, you can use this syntax :
${(object.attribute)!} or, if you want display a default text when the attribute is null :
${(object.attribute)!"default text"} You can use the ?? test operator:
This checks if the attribute of the object is not null:
<#if object.attribute??></#if> This checks if object or attribute is not null:
<#if (object.attribute)??></#if> Source: FreeMarker Manual
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