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Tapestry IOC Configuration is the configuration of Tapestry both the IOC services – both those provided by Tapestry and those you write yourself – is done . Both are configured in the same way: using Java, not XML.

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Modules configure a service by contributing to service configurations. This seems may seem esoteric , but is quite handy, and is best explained by but is really pretty simple. We'll explain with an example.

Let's say you've written a bunch of different services, each of which does something specific for a particular type of file (identified by the file's extension), and each implements the same interface, which we'll call FileServicer. And now let's say you need a central service that selects the one of your FileServicer implementations based on a given file extension. You start by providing a service builder method:

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• It makes it much easier for an override of the service to get the configuration intended for the original service.

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For mapped configurations where the key type is String, a CaseInsensitiveMap will be automatically used (and passed to the service builder method), to help ensure that case insensitivity is automatic and pervasive.

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In Tapestry 5.0, services that wanted to support this kind of override behavior had to implement it on an ad-hoc basis, such as ApplicationDefaults overriding FactoryDefaults. In many cases, that is still useful.