What is Tapestry?
Pure Java and Polyglot
Written in pure Java: code your pages and components in Java, Groovy or Scala.
Convention Over Configuration
Say goodbye to endless XML configuration files: dependency injection and meta-programming through annotations and naming conventions.
Highly Productive
Live class reloading means that the time between seeing an error and providing the fix is seconds, not minutes.
Scalable
Scales up big on a single server, and works great in a cluster. Keeps session state minimal by design.
Advanced Exception Reporting
Gives you all the tools you need to fix your problem: not just a stack trace, but every bit of information you need to know about what Tapestry was doing, why it was doing it, what went wrong, and how to fix it.
Testable
Committed to testability throughout design; built-in utilities to enhance TDD. Support for Selenium for integration testing. See Tapestry's code coverage report
Fast
Pure Java; no reflection, not even for property expressions. Built to cleanly support large numbers of concurrent threads without contention. Integrated GZip content compression, JavaScript aggregation and compression, and client-side caching.