API / Apache Velocity Interview questions

What is the difference between local and global (library) Velocimacros?

Both are defined the same way, with #macro(name params) ... #end, but they differ in scope and where they're declared.

Aspect	Local macro	Global (library) macro
Defined in	Directly inside the template that uses it	A separate .vm file registered via velocimacro.library
Visibility	Only that one template, by default	Every template rendered by the engine
Best for	One-off helpers specific to a single page	Shared UI components used across many templates
Override behavior	Can shadow a global macro of the same name if velocimacro.permissions.allow.inline is enabled	Provides the default implementation everyone else falls back to

Most non-trivial applications register at least one library file, since it avoids redefining common components like pagination controls or form field wrappers in every template that needs them.

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Where is a global (library) Velocimacro defined? Inline at the top of every template that uses it

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In a separate file registered via the velocimacro.library property

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Directly inside the VelocityContext object

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In the web.xml deployment descriptor

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By default, where is a locally defined macro visible? Across every template the engine renders

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Only within the template where it was defined

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Only inside #parse-included files

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It is never visible; local macros require a library

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API / Apache Velocity Interview questions

What is the difference between local and global (library) Velocimacros?

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