Google Web Toolkitwww.jug.lv

AgendaIntroductionWhy is unique?Why needed?Who uses?

PollWho knows what GWT is?Who tried that?Who is using in projects?

Compared to Other FrameworksStrutsJSFApache WicketZKSpring MVCRails...

The RealityNot really the same…GWT is a Rich Client Framework Similar to hand-written JavaScript client

ArchitectureStandalone clientHTTP/Ajax communication

Rich Client (JavaScript)

Java Backend (REST, RPC)

HTTP

http://gwt.google.com/samples/Mail/Mail.html

The EssenceSwing-like development model

Cross-browser Java to JavaScript Compiler

Statement

GWT is one of the best tools for webapp scalability

GWT Performance Tricks

trafficmemor

ycpu

GWT CompilerTranslationOptimizationCompression Obfuscation

Deferred BindingSeparate JS for each browser

Byte- code

Java Script

Java Script

Java Script

Java Code

javac gwtc

Bootstrap Sequenceindex.html (small, temporary cache)nocache.js (small)cache.js (large, eternal cache)

Code SplittingSingle JS is too large

Split Points

Loads JS in partsHTTP

Main.java

One.java Two.java Three.java

No Page ReloadsAnchors-basedSingle page applicationNo refreshes (no HTTP traffic)

http://www.site.com/#index

http://www.site.com/#search

http://www.site.com/#resource/1?option=Y

Async ModelSingle thread

Callbacks

RPC SerializationDirect-EvalSimpleTODO Give snippets

Resource BundlesImagesText resourcesCSS

Summary

GWT Pros and Cons+ Full control+ Performance and scalability+ Portability+ Development Speed- Non-trivial development model- Plenty of design/architecture options- IE6 and IE7 are still out there...

ConclusionsVery powerful yet complicated toolCache everythingCompress everythingLess HTTP requests

FutureVersion 2.1 is out now (October 29th)

Questionshttp://code.google.com/webtoolkit/

About the SpeakerDmitry Buzdin

Agile software developer working with Java since 2005Based in C.T.CoReach me at buzdin@gmail.com