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Thursday, April 28, 2011
JavaEE and Google AppEngine
Aleš Justin, JBoss by Red Hat
Thursday, April 28, 2011
•What is GAE and CDI?•Why GAE and CDI?•Other JavaEE technologies•Development vs. Production•Problems vs. Solutions•Testing•Q & A
Agenda
Thursday, April 28, 2011
•Old school JBoss-ian•Microcontainer co-author•Weld lead•RHT Cloud “guinea pig”
•Eager PaaS user•While still GAE amateur
About me
Thursday, April 28, 2011
•Forked Jetty•Many (logical) restrictions•RDBMS → BigTable•Simple Map(Reduce)•Good administration•Free basic usage
GAE
Thursday, April 28, 2011
•Context and Dependency Injection•JSR-299 → JBoss Weld RI•“type-safe” programming•“contexts” concept•Easy to extend: “Extensions”•“CDI extension n00b ...” up next
CDI
Thursday, April 28, 2011
•Simple reason: sandbox app•Android app with server back-end•Tattletale (Tožibaba)
•Zero administration / configuration•Reliable up-time•No more “boiler-plate” code → CDI
Why GAE and CDI?
Thursday, April 28, 2011
•@Inject•@Qualifier•@Named•@Scope•Interceptors•InjectionPoint•Instance•@Produces
•@Observes•@ConversationS.•@Decorator•@Alternative•@Sterotype
•Catch @Any CDI session!
CDI #2
Thursday, April 28, 2011
•JPA•JSF2•BeanValidation•javax.cache•JSON•ShrinkWrap + Arquillian
Other technologies
Thursday, April 28, 2011
•Know (all) restrictions!•30sec, white-list, no threads, ...
•How portable should my app be?•Development vs. Production Env!•Frameworks have problems•But they mostly have (easy) solutions → fork?
Project Kick-Off
Thursday, April 28, 2011
•Abstract away GAE API•Pure JavaEE•Port app to JBossAS (6 & 7)
•Use CDI as much as possible•Test it all, same as other JavaEE apps
The Goal
Thursday, April 28, 2011
•CDI•“Entry” mechanism•Request / response binding•Lack of “lifecycle” handling
Bean
ProxyInitial problems
Thursday, April 28, 2011
•JPA•Limited relationships (Entity groups)•Proxying layer vs. Custom “ORM”
•Transaction per “Entity group”•Old DataNucleus version•Long vs. Key entity key•“Enhanced” entities•GeoModel hashing queries (“IN”)
Initial problems
Thursday, April 28, 2011
•JSF2•Context parameter settings•“new InitialContext” patch•“built-in” EL 1.0 → workaround
Initial problems
Thursday, April 28, 2011
•BeanValidation•Static usage with JPA•Size•Configuration
Initial problems
Thursday, April 28, 2011
•javax.cache (GCache)•No partition•NUCCORE-540 → fork
•JSON•Different versions; client vs. server
•Arquillian•Missing GAE container
Initial problems
Thursday, April 28, 2011
•CDI•“Bean scanning” → exact listing•“Lazy beans” → MVC re-write•GZIP + Base64 usage•“Fall-back / repeat” mechanism
“Production” problems
Thursday, April 28, 2011
•JPA•Explicit entity listing•Maximize cache usage•“Caching” → Lazy EMF
•javax.cache•serialVersionUID•Non-primitive variables•Cache evict / clear mechanism
“Production” problems
Thursday, April 28, 2011
•ShrinkWrap•Binaries abstraction
•Arquillian•Runtime / Env abstraction•https://github.com/alesj/arquillian
Testing
Thursday, April 28, 2011
•Lhotse POC•https://github.com/alesj/lhotse
Server-API
Server-JEEServer-GAE
Tattletale
Lhotse
Tattletale
Thursday, April 28, 2011
•Integrated & tested•GAE•JBossAS v6 & v7•GlassFish 3.1
•Important differences•Libraries usage
•Configuration ➚•Bugs, ...
•@Entity on @MappedSuperclass•Enhanced entities + JDO
Lhotse POC
Thursday, April 28, 2011
