What is Tapestry 5? 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. 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. Automatic GZip content compression, JavaScript aggregation, and client-side caching. Adaptable And Modular Architecture is open and extensible. There's a clean way to add your own extensions, or override built-in logic. Provides integration with Hibernate and Spring. Third-party integrations with other tools, such as Quartz and Lucene.