I don't understand why cfg.setObjectWrapper(new DefaultObjectWrapper()); must be used

Hello.

I've seen something I don't understand in freemarker's documentation:

Page
http://www.freemarker.org/docs/pgui_quickstart_createconfiguration.html
("Create a configuration instance")
says that
cfg.setObjectWrapper(new DefaultObjectWrapper());
must be used.

I don't understant why cfg.setObjectWrapper(new DefaultObjectWrapper());
is necessary.

The default object wrapper is suposed to be a thread-safe singleton, isn't it?

By the way, I haven't seen that line in freemarker's examples.

Thank you very much.

  Jose

P.S.: Sorry for my English.

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