Spring 3.1 to 3.2 in a Nutshell. Sam Brannen Senior Software Consultant

Transcription

1 Spring 3.1 to 3.2 in a Nutshell 17 April 2012 Sam Brannen Senior Software Consultant

2 Speaker Profile Spring & Java Swi4mind Developing Java for over 14 years Spring Framework Core Commi?er Spring Trainer Lead author of Spring in a Nutshell 2

3 A Show of Hands...

4 Agenda Major Themes in 3.x Environment and Profiles Java- based ConfiguraPon TesPng Caching MVC and REST Servlet Roadmap 4

5 Major Themes in Spring 3.0

6 Agenda Java- based configurapon 6

7 Agenda custom stereotypes 7

8 Agenda annotated factory methods 8

9 Agenda JSR- 330 DI for Java 9

10 Agenda Spring Expression Language 10

11 Agenda REST support in Spring MVC 11

12 Agenda Portlet API

13 Agenda JSR- 303 bean validapon 13

14 Agenda Java EE 6 support: JPA 2.0, JSF

15 Major Themes in Spring 3.1 Environment abstraction Java-based application class test support High-level cache API processing Flash maps and redirect attributes Explicit support for Servlet

16 Environment and Profiles

17 Environment Abstraction Injectable environment abstraction API org.springframework.core.env.environment Two core concepts Property Sources Bean Profiles Property Source: A variety of sources: property files, system properties, servlet context, JNDI, etc. Bean Profile: A logical group of bean definitions. Registered only if the profile is active. 17

18 Property Source Abstraction Property source Property resolution Placeholders 18

19 PropertySource(s) PropertySource a single property source PropertySources a hierarchy of PropertySource objects potentially varying across deployment environments 19

20 Property Resolution SPI org.springframework.core.env.propertyresolver Environment extends PropertyResolver 20

21 Custom Placeholder Resolution PropertySourcesPlaceholderConfigurer supersedes PropertyPlaceholderConfigurer dependent on the actual environment 21

22 Managing Property Sources Stand-alone code Web application Implement ApplicationContextInitializer Register via contextinitializerclasses context parameter in web.xml 22

23 Accessing Properties By injecting the Environment 23

24 Bean Definition Profiles Logical grouping of bean definitions for activation in specific environments e.g., dev, staging, prod, cloud, possibly different deployment platforms Configuration XML via <beans profile= > Java-based configuration 24

25 Configuring Profiles in XML All bean definitions Subset of bean definitions 25

26 Configuring Profiles in Java can also be used @Repository, etc. 26

27 Profile Activation Options programmatically system property in web.xml in tests 27

28 Activating Profiles... programmatically 28

29 Activating Profiles... via system properties -Dspring.profiles.active= dev -Dspring.profiles.default= common 29

30 Activating Profiles... in web apps 30

31 Activating Profiles... in integration tests 31

32 Java-based Configuration

33 Java Config ~= XML XML namespaces FactoryBeans à builders GenericXmlContextLoader à AnnotationConfigContextLoader Not a one-to-one mapping Make the most of what Java has to offer Intuitive annotation-oriented container configuration 33

34 @Enable* Annotations Roughly equivalent to their XML namespace counterparts Applied at the class-level classes 34

35 Typical Infrastructure Setup Transactions Scheduling MVC customization AOP 35

36 @Enable* 36

37 Hibernate and JPA Hibernate LocalSessionFactoryBuilder API Hibernate 4 replacement for both LocalSessionFactoryBean and AnnotationSessionFactoryBean XML-free JPA configuration LocalContainerEntityManagerFactoryBean has a new property packagestoscan: analogous to AnnotationSessionFactoryBean 37

38 Java Configuration Example Actually: LocalSessionFactoryBuilder 38

39 Testing

40 New Testing Features in class support Environment profile support SmartContextLoader AnnotationConfigContextLoader DelegatingSmartContextLoader Updated context cache key generation 40

41 SmartContextLoader SPI Supersedes ContextLoader Strategy for loading application contexts classes or resource locations Supports environment profiles 41

42 @ContextConfiguration accepts a new `classes` attribute... 42

43 Test #1 43

44 Test #2 44

45 Caching

46 Caching Abstraction Declarative caching for Spring applications Minimal impact on code Plug in various caching solutions 46

47 47

48 Cache Key All method arguments used by default Use SpEL to select more specifically (use class, method, or argument name) 48

49 Conditional Caching 49

50 Cache Providers (1/2) Cache and CacheManager SPI org.springframework.cache Cache Implementations EhCacheCache ConcurrentMapCache and ConcurrentMapCacheFactoryBean 50

51 Cache Providers (2/2) CacheManager Implementations EhCacheCacheManager ConcurrentMapCacheManager SimpleCacheManager NoOpCacheManager Any other implementation can be plugged in GemFire, Coherence, etc. 51

52 Cache Configuration Cache namespace <cache:annotation-driven /> cachemanager bean 52

53 MVC and REST

54 @MVC 3.0 Config Built-in defaults based on DispatcherServlet.properties Spring MVC namespace <mvc:annotation:driven>, <mvc:interceptors>, 54

55 3.1 Config Most Spring MVC configuration is already etc. Servlet 3.0 enhancements further reduce the need for web.xml XML namespace is convenient but Not transparent Not easy to offer the right degree of customization 55

56 Agenda What should a Java equivalent to the MVC namespace look like? 56

57 @EnableWebMvc Enables Spring MVC default configuration Registers components expected by the DispatcherServlet Allows for configuration similar to the Spring MVC namespace and the DispatcherServlet.properties combined 57

58 A More Complete Example Add component scanning and other beans 58

59 Q: Where is the Enabled Config?! A: a class (actually DelegatingWebMvcConfiguration) 59

60 How Do I Customize All This? Simply implement the WebMvcConfigurer interface Allows selecpve overriding 60

61 HandlerMethod Abstraction HandlerMethod A proper abstraction for the selected handler in Spring MVC Not just @ExceptionHandler methods HandlerMethod support classes RequestMappingHandlerMapping RequestMappingHandlerAdapter ExceptionHandlerExceptionResolver 61

62 @PathVariable args à Model These can be deleted 62

63 URI Templates in Redirect Strings Expanded from model a?ributes, which now 63

64 URI Template Vars in Data Binding 64

65 Matching MediaTypes 3.1 Using the 'headers' condition 65

66 Matching MediaTypes 3.1 The 'consumes' and 'produces' conditions If not matched, results in: UNSUPPORTED_MEDIA_TYPE (415) If not matched, results in: NOT_ACCEPTABLE (406) 66

67 Servlet 3.0

68 Servlet 3.0 Containers Tomcat 7 and GlassFish 3 Explicitly supported While preserving compatibility with Servlet

69 XML-free Web-app Config Support for XML-free web application setup no web.xml Made possible via: Servlet 3.0's ServletContainerInitializer Spring 3.1's AnnotationConfigWebApplicationContext Spring 3.1 s environment abstraction 69

70 Native Servlet 3.0 Asynchronous request processing Standard Servlet 3.0 file upload behind Spring's MultipartResolver abstraction 70

71 Bonus

72 "c:" Namespace Shortcut for <constructor-arg> inline argument values analogous to existing "p:" namespace Use of constructor argument names recommended for readability debug symbols have to be available in the application's class files 72

73 Spring 3.1 in a Nutshell Environment and Profiles Java-based Configuration Testing and Profiles Cache Abstraction MVC and REST Improvements Servlet 3.0 c: Namespace 73

74 Spring 3.2 Roadmap

75 Build System & Source Control Moved from Subversion to Git(hub) Spring github.com/springsource/spring- framework Moving from Spring Build (i.e., Ant + Ivy) to Gradle Spring 3.2 SPR

76 Servlet 3.0/3.1 Async Requests Servlet 3.0/3.1 asynchronous request processing Explicit support in SPR

77 Java EE 7 JPA 2.1 (JSR- 338) Building on JPA 2.0 support in Spring 3.0 SPR JSF 2.2 (JSR- 344) SpecificaPon compapbility SPR JMS 2.0 (JSR- 343) Long overdue, major overhaul to JMS Exploring a napve JMS API style for use with Spring SPR

78 Caching Support for JCache (JSR- 107) compliant cache providers JCacheCacheManager/Cache adapters for Spring's SPI JCacheManager/JCacheFactoryBean Support for JCache's standardized caching annotapons ideally automapcally through Spring s <cache:annotapon- driven> SPR

79 Validation Bean ValidaPon 1.1 (JSR- 349) SpecificaPon compapbility Building on 1.0 support in Spring 3.0 SPR

80 Spring Core Migrate from CGLIB to Javassist For class- based proxies (AOP) SPR Bean definipon visibility and overriding Final bean definipons Profile- scoped methods override XML beans SPR

81 Spring MVC Testing Support Unit tests with Mock MVC classes Simulates the DispatcherServlet SPR IntegraPon tests with XmlWebApplicaPonContext Configured and other annotapons Loaded via a new ContextLoader SPR

82 In Closing...

83 Further Resources Spring Framework h?p://springframework.org Spring Reference Manual JavaDoc Spring Forums h?p://forum.springframework.org Spring JIRA h?p://jira.springframework.org 83

84 Blogs SpringSource Team Blog category 3.1 h?p://blog.springsource.com/category/spring/31/ SwiHmind Blog h?p:// 84

85 Q & A Sam Brannen Spring in a Nutshell available from O Reilly in