Modular Java EE in the cloud
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1 Modular Java EE in the cloud A practical guide to mixing java EE and OSGi Jfokus 2013
2 Practical Guide to Modularity in the Cloud Age Jfokus 2013
3 Bert Ertman Fellow at Luminis in the Netherlands JUG Leader for NLJUG and a Java Paul Bakker Architect at Luminis Technologies A presentation
4 Trend Applications tend to grow bigger and more complex Agile development and refactoring have become more common
5 This leads to a number of challenges : Dependency Management Versioning Maintenance (long term) Deployment
6 Apps are moving to the cloud Cloud challenges require nontrivial non-functional requirements Zero-downtime deployments Modular deployments Customer specific extensions (SaaS)
7 Modularity is the answer
8 But... what exactly is modularity?
9 What we learned about OO design in university : Promote cohesion Prevent (tight) cohesion coupling coupling
10 How to prevent coupling in a code base?
11 How to prevent coupling in a code base? interfaces
12 But how to make sure nobody accidentally uses implementation classes?
13 But how to make imp lemen tation sure nobody accidentally uses implementation hi di ng classes?
14 Modules
15 Ok, but how to create an instance of a hidden class? MyInterface myi = new MyImplementation();
16 Service Lookups
17 Design time modularity Divide and conquer Forces separation of concerns Prevents spaghetti
18 The jar file is the unit of runtime modularity on the Java platform What about classpath hell?
19 How to deal with Runtime dynamics Module versioning Updating single modules Intra-module dependency management
20 What do we need? design consequences High-level Architectural focus on modularity let s not reinvent the Runtime dynamic module framework Right now, enterprise APIs wheel OSGi is the only option
21 OSGi!= modularity OSGi is the de-facto standard module system for Java What about Jigsaw?
22 OSGi!= modularity OSGi is the de-facto standard module system for Java remember! Modularity is an architectural principle What about Jigsaw?
23 OSGi!= modularity OSGi is the de-facto standard module system for Java remember! Modularity is an architectural principle What about Jigsaw? Modularity does not come for free with a framework
24 Demo
25 OSGi vs. Java EE
26 OSGi vs. Java EE : opposite ends? Java EE: high level APIs OSGi: low-level, mix and match yourself
27 OSGi vs. Java EE : opposite ends? Java EE: high level APIs They don t have to be either / or OSGi: low-level, mix and match yourself
28 How? - 3 options #1 OSGi as core architecture with EE APIs published as services #2 Hybrid solution using an injection bridge #3 OSGi a la carte
29 Option 1 - OSGi in Java EE App Servers OSGi bundles as your core use app server capabilities like clustering, data sources, etc. programming model Java EE APIs available from within bundles the (near) future!
30 Web Application Bundle (WAB) Enterprise OSGi standard Easy registration of Servlets and JAX-RS WAR with a components manifest
31 Web Application Bundle (WAB) manifest.mf mywab.jar META-INF/manifest.mf index.html WEB-INF/classes/ MyResource.class WEB-INF/faces-config.xml WEB-INF/web.xml Bundle-Name: agenda.web.ui Web-ContextPath: /myweb Import-Package: javax.servlet /myweb/index.html /myweb/agenda
32 EJB Bundles Not a standard yet! Use transactions and JPA like you normally would Publish EJBs as OSGi services
33 EJB Bundles manifest.mf Bundle-Name: agenda.storage.ejb Export-EJB: ALL
34 OSGi CDI integration RFP 146 Prototyped in WELD Use CDI within bundles Use CDI to produce / consume services
35 How are the app servers doing? App server Deploy bundles WAB support EJB/JPA support Glassfish WebSphere WebLogic JBoss AS
36 Option 2 : Hybrid solution Best of both worlds? Your app is effectively split into two parts: Adminstrative enterprise part -> Java EE Dynamic part where services can be replaced without downtime -> OSGi Glue the two together using an injection bridge
37 Example
38 Option 3 - OSGi a la carte Demo
39 What about deployment?
40 What about deployment? Apache Ace - demo -
41 Apache ACE
42
43 Wrap up
44 What have we learned? You ve seen the future of enterprise development ;-) Why modularity is important (in the cloud) Practical solution for doing modularity now
45 Recommended reading
46 Cloud provisioning Cloud OSGi services Bert Ertman Eclipse OSGi plugin That s us Paul Bakker
47
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