Lessons Learned from Real-World Deployments of Java EE 7 at JavaOne 2014
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This document discusses lessons learned from real-world deployments of Java EE 7. Key points include increased developer productivity through features like batch processing, concurrency, simplified JMS, more annotated POJOs, and a cohesive integrated platform. Specific technologies used include JSON, WebSockets, Servlet 3.1 NIO, and REST. Real-world examples of implementations include an application for a UN agency to support refugees and a running social network application for runners.
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Lessons Learned from Real-World Deployments of Java EE 7 at JavaOne 2014
- 1. Lessons learned from real-world deployments of Java EE 7 Arun Gupta, Red Hat @arungupta
- 2. DEVELOPER PRODUCTIVITY MEETING ENTERPRISE DEMANDS Java EE 7 ! Batch ! Concurrency ! Simplified JMS ! More annotated POJOs ! Less boilerplate code ! Cohesive integrated platform ! WebSockets ! JSON ! Servlet 3.1 NIO ! REST
- 3. • UN agency to protect and support refugees • Help UN refugees to get benefits through secured card wallets • Register, issue card, POS, ATM, Settlement • Refugees get cash or use cards at merchants
- 4. Architecture
- 5. Technology • JSON: Notification messages to agents (simple messages created using JSONBuilder, No dependency on 3rd party library) • Batch: End of day tasks like posting of accounts, generation of reports, email to clients and banks • Concurrency: Managed threads pool for work?? • EJB: Backend services (locally and remotely) • JAX-WS: Integration with WFP/UNHCR systems (exposed interface)
- 6. Technology • JPA! • Stored procedure calls (Oracle and SQL Server) • Two-way schema (model using JPA, generate schema, tune it, and regenerate entities) • Change requests • Default CDI enabled (ease of integration between different layers)
- 7. Additional Libraries • PrimeFaces • Great support in NetBeans • Generator plugin (in NetBeans) that facilitate and streamline development of pages based on entity beans (e.g. Admin and Operations page) • jQuery stock library (streamline UI development in few lines)
- 8. Runtime • GlassFish 4 • 2 instances deployed locally • Mandate to use commercial app server • Java SE 7 • Oracle 11g and Microsoft SQL Server 2008
- 9. Tools • NetBeans 7.4 • Integrated GlassFish management • Many templates to start from • PrimeFaces generator plugin • Great compatibility with HTML5
- 11. miles2run.org • Track your daily runs • Day or distance-based goals or community runs • Social network for runners • Its free
- 16. Technology • User Interface • Thymeleaf HTML5 templates rendered by JAX-RS • AngularJS based multiple SPA, consuming JAX-RS endpoints • Twitter Bootstrap theme • Authentication using JAX-RS filters • D3.js and C3.js for pretty graphs
- 17. Technology • Middleware • EJB + JPA services for RDBMS • CDI services for NoSQL datastores • Joda-Time API for working with Date • Authenticating with various OAuth providers like Twitter using respective client API. Planning to upgrade to Keycloak. • SFL4J with logback for logging
- 18. Additional Libraries • Thymeleaf template engine for server side HTML5 views • OAuth providers with client libraries • Joda-Time for working with date/time • jadira.usertype for storing date as UTC in database • Database drivers for Redis and Mongo • JUnit with Mockito for Unit testing • Arquillian for integration testing
- 19. Runtime • JDK 8 • WildFly 8.1.0 Final: 2 scalable instances running on OpenShift with HA Proxy Load Balancer • Data Stores • MySQL - All business entities like Activity, Goal, User profile, etc. • Redis - Generate timeline data using sorted sets and storing all counters • MongoDB - Location based user recommendations, follower/ following stored using in-built array types
- 20. Tools • IntelliJ IDEA • Git as version control • Jenkins - planned for CI and deployment
- 21. Wish list for Java EE 8 • Support for NoSQL database • Easy to add OAuth support to application and use existing OAuth providers • Modern MVC framework with support for pluggable template engines
- 23. tipi.camp • Campground management • Reservations, portal, email, monitoring, … • Targeting 25k+ campgrounds in Europe • Customer-friendly booking portal • On-premise or SaaS • €1 or $1 / day
- 28. Technology • Presentation • JavaServer Faces + Expression Language • Security: JAAS principal + JDBC-realm • Middle Tier • EJB for business boundaries • Servlets with JSON for web hooks: response from Paypal and Sendgrid • JAX-RS for exposing API to partners
- 29. Technology • Backend • JPA + Bean Validation, use @Index for database generation • Concurrency: Calculation of statistics and sending messages (Using @Startup @Singleton @Schedule, Sendgrid takes ~1-4 seconds) • JDK-8 specific features: Lambdas, parallel streams, Date/Time API
- 30. General Principles • All components used with @Inject! • bean-discovery-mode=“all” • All named beans are JSF 2.2 @ViewScoped • All boundaries are only @Stateless, no @Remote or @Local interfaces • All modules in entity-control-boundary pattern
- 32. Additional Libraries • PrimeFaces5 and Bootstrap for the responsive portal • Sendgrid API for sending emails • Flyway for database migrations • Misc Apache Commons (FileUtils.writeByteArrayToFile, IOUtils.toByteArray) • JUnit with Derby for testing
- 33. Runtime • JDK 8 • WildFly 8.1.0 - super, unique product • MySQL 5.1.73
- 34. Tools • IntelliJ 13.1 • Jenkins • loader.io for load testing • Self-hosted Linux server in hetzner.de data center • Planning to migrate to OpenShift in 2015
- 35. Wishlist for Java EE 8 • Apache Commons Library • Generics in Batch Processing • @Temporal should work with LocalDate and LocalDateTime I have no great wishes, the technology is perfect. I’m with java/ee7 very productive, i’m and our customers are with java ee7 happy. With the technology, really everything is possible.
- 37. Resources • Java EE 7 tutorial: http://docs.oracle.com/javaee/ 7/tutorial/doc/home.htm • ~200 code samples: github.com/javaee-samples/ javaee7-samples • Lots of books