API / Apache FreeMarker Interview questions

What is the purpose of the FreeMarker Configuration object?

freemarker.template.Configuration is the central, application-wide settings object for FreeMarker. It is normally created once and reused for the lifetime of the application rather than per request, because it owns the template cache.

It controls things such as:

Where templates are loaded from (via a TemplateLoader)
The default Locale, number format, and date/time formats
The output encoding and ObjectWrapper used to expose Java objects
The incompatible_improvements version flag and TemplateExceptionHandler

Application code obtains a compiled template with configuration.getTemplate("name.ftl"), then merges it with a data model.

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Why is a single Configuration instance normally shared across an application?Because it owns the template cache and holds application-wide settings

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Because FreeMarker forbids creating more than one instance per JVM

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Because it stores the HTTP session for each request

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Because templates cannot be parsed without a database

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Which of these is configured on the Configuration object?The servlet container's thread pool size

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The Java compiler version

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The TemplateLoader used to find template source

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The default Locale and ObjectWrapper

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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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