API / Apache FreeMarker Interview questions

What is the difference between BeansWrapper and DefaultObjectWrapper?

DefaultObjectWrapper extends BeansWrapper and is the wrapper application code is expected to use directly; it adds FreeMarker-aware handling for the engine's own built-in collection types (such as SimpleHash and SimpleSequence) and applies safer, more template-friendly defaults on top of the plain bean-introspection behavior.

Aspect	BeansWrapper	DefaultObjectWrapper
Relationship	Base class	Subclass of BeansWrapper
Typical use	Lower-level building block, used internally or for special integrations	Recommended default for Configuration.setObjectWrapper()
Handling of FreeMarker's own model types	Treated like any other Java object	Recognized and handled specially

In day-to-day application code there is rarely a reason to instantiate BeansWrapper directly - it exists mainly as the shared foundation that other, more template-appropriate wrappers build on.

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Which class is the recommended default for an application's object wrapper?SimpleObjectWrapper only, in every case

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DefaultObjectWrapper

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RawJavaWrapper

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BeansWrapper

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How does DefaultObjectWrapper relate to BeansWrapper?It is a subclass that adds FreeMarker-aware handling on top of it

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DefaultObjectWrapper replaces BeansWrapper entirely in the API

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They are unrelated, competing implementations

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BeansWrapper is a subclass of DefaultObjectWrapper

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