Web flow

Spring Web Flow Reference Guide
Keith Donald Erwin Vervaet Jeremy Grelle Scott Andrews Rossen Stoyanchev

Version 2.0.9
Published

Copies of this document may be made for your own use and for distribution to others, provided that you do not charge any fee for such copies and further provided that each copy contains this Copyright Notice, whether distributed in print or electronically.Table of Contents
Preface ................................................................................................................................. vii 1. Introduction ....................................................................................................................... 1 1.1. What this guide covers........................................................................................... 1 1.2. What Web Flow requires to run ............................................................................. 1 1.3. Where to get support .............................................................................................. 1 1.4. Where to follow development ................................................................................ 1 1.5. How to access WebFlow artifacts from Maven Central ....................................... 1 1.6. How to access Web Flow artifacts from the SpringSource Bundle Repository .... 2 1.7. How to access nightly builds ................................................................................. 4 2. Defining Flows.................................................................................................................. 7 2.1. Introduction ............................................................................................................ 7 2.2. What is a flow? ...................................................................................................... 7 2.3. What is the makeup of a typical flow? ................................................................... 8 2.4. How are flowsauthored? ....................................................................................... 8 2.5. Essential language elements .................................................................................. 9 2.6. Actions ................................................................................................................. 10 2.7. Input/Output Mapping......................................................................................... 12 2.8. Variables .............................................................................................................. 14 2.9. Calling subflows .................................................................................................. 14 3. Expression Language (EL)............................................................................................. 17 3.1. Introduction .......................................................................................................... 17 3.2. Supported EL implementations ............................................................................ 17 3.3. EL portability....................................................................................................... 17 3.4. EL usage ............................................................................................................... 17 3.5. Special EL variables ............................................................................................ 19 3.6. Scope searching algorithm ................................................................................... 21 4. Rendering views.............................................................................................................. 23 4.1. Introduction .......................................................................................................... 23 4.2. Defining view states ............................................................................................. 23 4.3. Specifying view identifiers...