API / Apache FreeMarker Interview questions

What is the purpose of the #include directive?

<#include "path/to/file.ftl"> textually inserts the output of another template directly into the current one at that point, similar to pasting a header or footer fragment into the page. It runs in its own local scope for variables declared with #assign/#local inside it, but it shares the surrounding namespace's existing variables, so values already assigned in the calling template are visible to the included file.

<#include "/common/header.ftl">
<h1>${pageTitle}</h1>
<#include "/common/footer.ftl">

It is the simplest way to reuse layout fragments like headers, footers, or navigation menus across many pages.

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What does <#include "/common/header.ftl"> do?Inserts that template's output inline at the current position

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Compiles header.ftl into a Java class

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Deletes the header.ftl file after use

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Loads header.ftl as a callable namespace object

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How does an #include'd template relate to the surrounding namespace?It runs completely isolated, seeing none of the caller's variables

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It replaces the caller's entire data model

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It shares the calling template's already-existing variables

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It can only be used once per template

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What is the purpose of interpolation (${...}) in FreeMarker? List the comparison operators supported in FreeMarker? What are the main use cases of FreeMarker? What are the types in FreeMarker's data model? How do you use the #assign directive? Describe the built-ins available in FreeMarker? How do you access static Java members (static methods, fields, and enum constants) from a FreeMarker template? What is Apache FreeMarker? What is the purpose of the FreeMarker Configuration object? What is the difference between FreeMarker's #switch/#case and a chain of #if/#elseif directives? What is the purpose of the <#if> directive? What are the types of loops available in FreeMarker? What is the difference between #assign and #local? How do you apply default values for missing variables in FreeMarker? Why doesn't FreeMarker allow templates unrestricted access to Java reflection and side-effecting method calls? What is the purpose of the incompatible_improvements setting? Define directive in FreeMarker? Which is generally the better choice for a new project today, FreeMarker or Velocity, and why? What is a FreeMarker template? What is the purpose of the #include directive?

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