Migration tales from java ee 5 to 7
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Are you still stuck in Java EE 5? Eager to move and boost developer productivity with all the cool things introduced in Java EE 7? Attend this session to hear about some of the solutions Tomitribe had to implement to completely migrate an application called Segurnet from Java EE 5 to Java EE 7. Expect a very technical session that delves into the details. Segurnet is a platform held by APS (Portuguese Insurance Association) that has served as an integration network for the insurance sector in Portugal for the last 20 years, with more than 33,000 active users.
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Migration tales from java ee 5 to 7
- 1. Roberto Cortez JavaOne 2015 #CON3212 Migration Tales from Java EE 5 to 7
- 2. Roberto Cortez Speaker, Blogger, Passionate Developer twitter: @radcortez mail: [email protected] blog: http://www.radcortez.com
- 3. This presentation is NOT about: • Technology X versus Y • Follow a step by step plan (BANG! You’re done) • Each case is different
- 4. It’s about: • Sharing knowledge • Telling our story • Learning about possible issues
- 5. Questions?
- 6. Questions? As soon as you have them!
- 7. A little bit of History • Java EE 5 (2006) and Java EE 7 (2013) are 7 years apart • 7 years in technology is like a century • Major changes introduced between 5 and 7
- 8. A little bit of History JPA JMS JCA Interceptors JTA Common Annotations EJB Servlet JSF JSP EL JAX-WS
- 9. A little bit of History JPA JMS JCA Interceptors JTA Common Annotations EJB Servlet JSF JSP EL JAX-WS Bean Validation CDI Managed Beans CDI Extensions Web Fragments JAX-WS JAX-RS
- 10. A little bit of History JPA JMS JCA Interceptors JTA Common Annotations EJB Servlet JSF JSP EL JAX-WS Batch Concurrency JSON WebSocket Bean Validation CDI Managed Beans CDI Extensions Web Fragments JAX-WS JAX-RS
- 11. The Platform • Segurnet acts as an integration network for the Insurance sector in Portugal. • It’s central to the Business • New challenges to keep the platform going
- 12. The Platform • SOA based Architecture • XML Messages by WS or Batch • Online Application
- 13. A few Numbers • 65 Companies • 32 258 Active Users • 141 084 250 Page Views • 325 605 701 Server Requests
- 14. Legacy • Since 2007 the platform is using Java EE 5 technology in a Java 6 environment • Other technologies are also used: GWT, Spring, Batch, Apache Projects, Velocity, BIRT • Runs in a JBoss 4.2.3 server
- 15. Stop the LegacyLinesofCode 0 350 700 1050 1400 2009 2010 2011 2012 2013 2014 2015 2016 1 170k1 135k 935k 810k 600k 490k 300k 130k
- 16. Motivations to Migrate • Benefit from the latest improvements • Java 6 EOL in Q1 2013 • Increased maintenance costs • Hard to keep developers interested
- 17. The Prelude
- 18. • Migrations are not straightforward • It’s difficult to know the path • Expect the unexpected On with the Journey
- 19. • Delays new Business Features • Non negotiable deadline • One Shot Strategy: Feature Freeze?
- 20. • Keep Development going • Best for Business • Requires more discipline and planning • By Module, Canary, Application Strategy: Combined?
- 21. • Application Server Upgrade to Wildfly 8.2.0 • Update / Duplicate Environments • Support Tools also need Migration / Tweaking (Maven, Jenkins, Sonar) First steps
- 22. Walking the Path
- 23. Dependency Chaos • Code tied to the Application Server • Code tied to specific Java EE implementations (especially Hibernate) • In house code to bypass Java EE 5 limitations
- 24. Dependency Chaos
- 36. One JAR to rule them all! <dependency> <groupId>javax</groupId> <artifactId>javaee-api</artifactId> <version>7.0</version> </dependency>
- 37. Dependencies Updates • Maven 2.2.1 • Java EE 5 • Spring 2.5.6 • Ehcache 1.5.0 • GWT 1.6.4 • Maven 3.2.3 • Java EE 7 • Spring 4.1.4 • Ehcache 2.8.3 • GWT 2.0.0
- 38. Dependencies Resolution • Try to keep with the Standards • Introduce additional libraries only if absolutely necessary • Easier to move on to new versions
- 39. Classloading Hell • ClassNotFoundException • NoClassDefFoundError • ClassCastException • JBoss dreaded UnifiedClassLoader
- 40. Classloading Hell • Servers change their libraries • These can clash with your Application libraries • Need to tune dependencies or rewrite code
- 41. Simplify Packaging • EAR to WAR • Other packages too: SAR, RAR • Enough for the majority of Projects
- 42. Keep on Walking
- 43. Easy to use Goodies • CDI • No more Local Interfaces • Singletons • Simplified JPA • Validations
- 44. public static <T> T getLocalBean(final Class<T> klass) { try { LocalBinding localBinding = klass.getAnnotation(LocalBinding.class); if (localBinding == null) { throw new BeanNotFoundException(“…”); } return (T) initialContext.lookup(localBinding.jndiBinding()); } catch (Exception e) { throw new BeanNotFoundException(“…”); } }
- 45. LocalBinding localBinding = klass.getAnnotation(LocalBinding. } } }
- 46. LocalBinding localBinding = klass.getAnnotation(LocalBinding. } } } @Inject
- 47. @Stateless @Local(UserBusiness.class) public class UserBusinessBean implements UserBusiness { … }
- 48. @Stateless public class UserBusinessBean implements UserBusiness { … }
- 49. @Stateless public class UserBusinessBean { … }
- 50. public class ModuleListener { private static ModuleListener moduleListener; private static ModuleBusiness moduleBusiness; private ModuleListener() { moduleBusiness = BeanFactory.getLocalBean(ModuleBusinessBean.class); } public static ModuleListener getInstance() { if (moduleListener == null) { moduleListener = new ModuleListener(); } return moduleListener; }
- 51. public class private static private static private BeanFactory.getLocalBean(ModuleBusinessBean. } public static if return
- 52. public class private static private static private BeanFactory.getLocalBean(ModuleBusinessBean. } public static if return @Singleton
- 53. @Singleton @Lock(LockType.READ) public class ModuleListener { @EJB private ModuleBusiness moduleBusiness; }
- 54. public List<PostalCode> findAddress(final String postalCode, final String postalCodeExt) { List<FieldCriteria> criterias = new ArrayList<FieldCriteria>(); criterias.add(new FieldCriteria("code", EQUALS, postalCode, AND)); criterias.add(new FieldCriteria("extension", EQUALS, postalCodeExt, AND)); return postalCodesDAO.findAll(PostalCode.class, null, criterias, null, true); }
- 55. public final List<FieldCriteria> criterias = AND postalCodeExt null, true }
- 56. public final List<FieldCriteria> criterias = AND postalCodeExt null, true } JPA Criteria API
- 57. public List<PostalCode> findAddress(final String postalCode, final String postalCodeExt) { CriteriaBuilder cb = em.getCriteriaBuilder(); CriteriaQuery<PostalCode> cq = cb.createQuery(PostalCode.class); Root<PostalCode> root = cq.from(PostalCode.class); cq.select(root).where( cb.equal(root.get(PostalCode_.code), postalCode), cb.equal(root.get(PostalCode_.extension), postalCodeExt)); TypedQuery<PostalCode> query = em.createQuery(cq); return query.getResultList(); } }
- 58. Query query = manager.createNativeQuery( "BEGIN PAC_GS_COMPENSATION_CHAMBER. execute_compensation_chamber( :protocol, :eligibility, :identifier, :userId); END;"); query.setParameter("protocol", protocol); query.setParameter("eligibility", eligibility); query.setParameter("identifier", identifier); query.setParameter("userId", userId); query.executeUpdate();
- 59. Query query = execute_compensation_chamber( :protocol, :eligibility, :identifier, :userId); END;" query.setParameter( query.setParameter( query.setParameter( query.setParameter( query.executeUpdate();
- 60. Query query = execute_compensation_chamber( :protocol, :eligibility, :identifier, :userId); END;" query.setParameter( query.setParameter( query.setParameter( query.setParameter( query.executeUpdate(); @NamedStoredProcedureQuery
- 61. public static int fieldEntityMaxLenght(Class clazz, String field) throws Exception { int maxLength = 0; if (field != null) { Column annotation = clazz.getDeclaredField(field).getAnnotation(Column.class); maxLength = annotation.length(); } return maxLength; } public static void rejectIfMaxLengthExceeded(String field, int maxLength) { if (field != null && field.length() > maxLength) { … } }
- 62. public static int clazz.getDeclaredField(field).getAnnotation( maxLength = annotation.length() } } public static void maxLength) { }
- 63. public static int clazz.getDeclaredField(field).getAnnotation( maxLength = annotation.length() } } public static void maxLength) { } @NotNull @Max
- 64. The End of a Journey
- 65. Was it worth it? • Removed Code • Code is growing at a slower pace • Easier to maintain
- 66. Was it worth it? • Productivity (1 minute deploy time vs 5) • Performance JVM (10 to 25% increase) • Developers Happy :)
- 67. Setbacks • Started in May 2013, finished October 2015 • Underestimate the Job • Business demands priorities
- 68. Setbacks • Vendors moved slowly to EE 7 • Blocked by Wildfly bugs • Missed dates multiple times • Not enough confidence in tests
- 69. New Horizons • Jumped straight away to Java 8 • Ready to face new Java EE versions • Easier to upgrade or change Server
- 70. New Horizons • Proper Testing frameworks (Arquillian) • Keep simplifying the code (JMS, Batch) • Adopt new specifications (Websockets)
- 71. Thank you for Attending! twitter: @radcortez mail: [email protected] blog: http://www.radcortez.com