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The core concept of Tapestry IoC is that the Java language itself is the easiest and most succinct way to describe object creation and method invocation. Any approximation in XML is ultimately more verbose and unwieldy. As the Tapestry IOC examples show, a small amount of Java code and a handful of naming conventions and annotations is far simpler and easier than a big chunk of XML.
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Another goal is "developer friendliness". This is a true cross-cutting concern, and one not likely to be packaged into an aspect any time soon. The Tapestry IoC framework is designed to be easy to use and easy to understand. Further, when things go wrong, it actively attempts to help you via comprehensive checks and carefully composed error messages. Further, all user-visible objects implement a reasonable toString() method, to help you understand what's going when you inevitably try to figure things out in the debugger.
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