I can see three possibilities.

• You don't actually have a module.

  As I define a module, it must have its own namespace and placed there using a package statement.

• The runs are in different Apache processes.

  Apache has many children to handle requests. Loading a module in one won't load it in the others (unless you load it in the mod_perl startup script).

• The module is loaded, but the symbols haven't been imported into the current namespace.

  use Some::Such; has two effects: require and import. A module only needs to be required once. (Subsequent calls to require are no-ops.) But you need to call import from each namespace into which you want to import.

Apache also restarts its children from time to time.

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