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Java EE and Spring Side-by-Side

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[Note that this talk is not available outside some very specific settings but this deck is here for you as a basic resource to form a basis for your own analysis based on my reasonably objective extensive professional experience using both technology sets in the real world]

Java EE 7 has been one of the most significant overhauls of the platform. Just some of the changes include retiring EJB 2 entity beans and JAX-RPC, greater alignment with CDI, WebSocket/HTML 5 support, a standard API for JSON processing, the next version of JAX-RS, an overhaul of JMS, long-awaited concurrency utilities, batch processing in Java EE and much, much more. In order to make educated choices for adoption, one should understand how the widely-used Spring Framework aligns with Java EE.

This session will compare and contrast the Spring Framework with Java EE 7. We will focus on key areas that include the component development model, dependency injection, persistence, UI, REST, messaging, security and testing. Beyond API/features, the analysis will take a holistic view in covering concerns such as ease-of-use, manageability, ecosystem and vendor-neutrality.

Veröffentlicht in: Technologie
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Java EE and Spring Side-by-Side

  1. 1. Spring and Java EE Side by Side Reza Rahman Java EE/GlassFish Evangelist Reza.Rahman@Oracle.com @reza_rahman
  2. 2. Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Public2 Program Agenda  Spring and Java EE  Side-by-Side  Ecosystems
  3. 3. Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Public3 A Bird’s Eye View
  4. 4. Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Public4 Main Features/APIs • Spring also integrates with EJB 3, but not CDI • Similar patterns for validation, WebSocket, JSON, XML, SOAP, remoting, scheduling, caching, etc
  5. 5. Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Public5 Java EE and Spring Component @Stateless public class BidService { @PersistenceContext private EntityManager entityManager; public void addBid(Bid bid) { entityManager.persist(bid); } } @Component public class BidService { @PersistenceContext private EntityManager entityManager; @Transactional public void addBid(Bid bid) { entityManager.persist(bid); } }
  6. 6. Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Public6 Spring Bootstrap (XML) <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd"> <context:component-scan base-package="com.actionbazaar"/> <tx:annotation-driven/> ... <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource"/> </bean> <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"> <property name="dataSource" ref="dataSource"/> <property name="loadTimeWeaver"> <bean class="org.springframework.instrument.classloading.InstrumentationLoadTimeWeaver"/> </property> </bean> </beans>
  7. 7. Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Public7 Defining the Data Source <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close"> <property name="driverClassName" value="oracle.jdbc.driver.OracleDriver"/> <property name="url" value="jdbc:oracle:thin:@localhost:1521:actionbazaar"/> <property name="user" value="scott"/> <property name="password" value="tiger"/> </bean> <data-source> <name>java:global/jdbc/myDataSource</name> <class-name>oracle.jdbc.driver.OracleDriver</class-name> <port-number>1521</port-number> <server-name>localhost</server-name> <database-name>actionbazaar</database-name> <user>scott</user> <password>tiger</password> <property> <name>createDatabase</name> <value>create</value> </property> </data-source>
  8. 8. Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Public8 Spring Bootstrap (Java) @Configuration @ComponentScan(basePackages="com.actionbazaar") @EnableTransactionManagement public class DataConfiguration { @Bean(destroyMethod="close") public DataSource dataSource(){ BasicDataSource ds = new BasicDataSource(); ds.setDriverClassName("oracle.jdbc.driver.OracleDriver"); ds.setUrl("jdbc:oracle:thin:@localhost:1521:actionbazaar"); ds.setUser("scott"); ds.setPassword("tiger"); return ds; } @Bean public PlatformTransactionManager transactionManager(){ return new DataSourceTransactionManager(dataSource()); } @Bean public LocalContainerEntityManagerFactoryBean entityManagerFactory(){ LocalContainerEntityManagerFactoryBean factory = LocalContainerEntityManagerFactoryBean(); factory.setDataSource(dataSource()); factory.setLoadTimeWeaver(new InstrumentationLoadTimeWeaver()); return factory; } }
  9. 9. Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Public9 Servlet Bootstrap <web-app> <context-param> <param-name>contextConfigLocation</param-name> <param-value> classpath*:**/applicationContext*.xml </param-value> </context-param> <listener> <listener-class> org.springframework.web.context.ContextLoaderListener </listener-class> </listener> ... </web-app>
  10. 10. Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Public10 Simple JSF Page <html xmlns="http://www.w3.org/1999/xhtml" xmlns:ui="http://java.sun.com/jsf/facelets" xmlns:h="http://java.sun.com/jsf/html" xmlns:f="http://java.sun.com/jsf/core"> <ui:composition template="/WEB-INF/template.xhtml"> <ui:define name="title">Add Bid</ui:define> <ui:define name="content"> <h3>Add Bid</h3> <h:form> <p>Item: <h:outputText value="#{item.name}"/></p> <p>Current bid: <h:outputText value="#{item.highestBid.amount}"/></p> <p>Amount: <h:inputText id="amount" value="#{bid.amount}"/></p> <p><h:commandButton value="Add bid" action="#{addBid.onClick}"/></p> </h:form> </ui:define> </ui:composition> </html>
  11. 11. Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Public11 CDI/JPA Components CDI Backing Bean JPA Entity @Named @ViewScoped public class AddBid { @Inject private BidService bidService; @Inject @LoggedIn private User user; @Inject @SelectedItem private Item item; @Produces @Named private Bid bid = new Bid(); public String onClick() { bid.setBidder(user); bid.setItem(item); bidService.addBid(bid); return “bid_confirm.xhtml”; } } @Entity @Table(name="BIDS") public class Bid { @Id @GeneratedValue private long id; @ManyToOne(optional=false) private User bidder; @ManyToOne(optional=false) private Item item; DecimalMin("0.0") private double amount; ... }
  12. 12. Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Public12 Servlet Bootstrap <web-app> <servlet> <servlet-name>Faces Servlet</servlet-name> <servlet-class>javax.faces.webapp.FacesServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>Faces Servlet</servlet-name> <url-pattern>*.xhtml</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>index.xhtml</welcome-file> </welcome-file-list> </web-app>
  13. 13. Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Public13 Spring MVC JSP Page <%@ taglib prefix="tiles“ uri="http://tiles.apache.org/tags-tiles" %> <%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %> <tiles:insertDefinition name="defaultTemplate"> <tiles:putAttribute name=“title">Add Bid</tiles:putAttribute> <tiles:putAttribute name=“content"> <h3>Add Bid</h3> <form:form modelAttribute="bid" method="post"> <p>Item: <form:errors path="item" cssClass="error"/> ${item.name}</p> <p>Current bid: ${item.highestBid.amount}</p> <p>Amount: <form:errors path="amount" cssClass="error"/> <form:input path="amount"/></p> <p><input type="submit" value="Add Bid"> </form:form> </tiles:putAttribute> </tiles:insertDefinition>
  14. 14. Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Public14 Spring MVC Controller @RequestMapping("/add_bid.do") @SessionAttributes({"item", "bid"}) public class BidController { @Autowired private ItemService itemService; @Autowired private BidService bidService; @RequestMapping(method=RequestMethod.GET) public String setupForm(@RequestParam("itemId") int itemId, ModelMap model) { Item item = itemService.getItem(itemId); model.addAttribute("item", item); Bid bid = new Bid(); model.addAttribute("bid", bid); return "add_bid"; } @RequestMapping(method=RequestMethod.POST) public String addBid(@ModelAttribute("item") Item item, @Valid @ModelAttribute("bid") Bid bid, HttpSession session, BindingResult result, SessionStatus status) { bid.setBidder((User)session.getAttribute("user")); bid.setItem(item); if (result.hasErrors()) { return "add_bid"; } else { bidService.addBid(bid); status.setComplete(); return "redirect:confirm_bid.do?itemId=" + item.getItemId(); } } }
  15. 15. Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Public15 Spring MVC Bootstrap <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <mvc:annotation-driven/> <context:component-scan base-package="com.actionbazaar"/> <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/> <property name="prefix" value="/jsp/"/> <property name="suffix" value=".jsp"/> </bean> <bean id="tilesConfigurer" class="org.springframework.web.servlet.view.tiles3.TilesConfigurer"> <property name="definitions"> <list> <value>/WEB-INF/tiles/tiles-definitions.xml</value> </list> </property> </bean> </beans>
  16. 16. Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Public16 Servlet Bootstrap <web-app> <context-param> <param-name>contextConfigLocation</param-name> <param-value> classpath*:**/applicationContext*.xml </param-value> </context-param> <listener> <listener-class> org.springframework.web.context.ContextLoaderListener </listener-class> </listener> <servlet> <servlet-name>actionbazaar</servlet-name> <servlet-class> org.springframework.web.servlet.DispatcherServlet </servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>actionbazaar</servlet-name> <url-pattern>*.do</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>jsp/index.jsp</welcome-file> </welcome-file-list> </web-app>
  17. 17. Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Public17 CDI Interceptor @Stateless public class BidService { @Inject private BidRepository bidRepository; ... @Audited public void addBid(Bid bid) { ... bidRepository.saveBid(bid); } } @Interceptor @Audited public class AuditInterceptor { @AroundInvoke public Object audit(InvocationContext context) { logger.log(Level.INFO, "Executing: {0}", context.getMethod().getName()); return context.proceed(); } } @InterceptorBindingType @Target({TYPE, METHOD}) @Retention(RUNTIME) public @interface Audited {}
  18. 18. Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Public18 Spring/AspectJ @Component public class BidService { @Autowired private BidRepository bidRepository; ... @Audited @Transactional public void addBid(Bid bid) { ... bidRepository.saveBid(bid); } } @Retention(RetentionPolicy.RUNTIME) @Target(ElementType.METHOD) public @interface Audited {} @Component @Aspect public class AuditAspect { @Before("execution(public * *(..)) && @annotation(Audited)") public void audit(JoinPoint joinPoint) { logger.log(Level.INFO, "Entering: {0}", joinPoint); } }
  19. 19. Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Public19 Spring/AspectJ Bootstrap <beans xmlns="http://www.springframework.org/schema/beans" ... xmlns:aop="http://www.springframework.org/schema/aop" xsi:schemaLocation="http://www.springframework.org/schema/beans ... http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd"> ... <aop:aspectj-autoproxy/> ... </beans>
  20. 20. Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Public20 JMS MDB @MessageDriven(activationConfig = { @ActivationConfigProperty(propertyName = "destinationType", propertyValue = "javax.jms.Queue"), @ActivationConfigProperty(propertyName = "destinationLookup", propertyValue = "java:global/jms/OrderQueue")}) public class OrderProcessor implements MessageListener { @Inject private OrderService orderService; public void onMessage(Message message) { try { ObjectMessage objectMessage = (ObjectMessage) message; Order order = (Order) objectMessage.getObject(); orderService.addOrder(order); } catch (JMSException e) { e.printStackTrace(); } } } <jms-destination> <name>java:global/jms/OrderQueue</name> <interface-name>javax.jms.Queue</interface-name> <resource-adapter>jmsra</resource-adapter> <destination-name>OrderQueue</destination-name> </jms-destination>
  21. 21. Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Public21 Spring JMS Listener @Component public class OrderProcessor implements MessageListener { @Autowired private OrderService orderService; @Transactional public void onMessage(Message message) { try { ObjectMessage objectMessage = (ObjectMessage) message; Order order = (Order) objectMessage.getObject(); orderService.addOrder(order); } catch (JMSException e) { e.printStackTrace(); } } }
  22. 22. Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Public22 Spring Message Listener Bootstrap <beans xmlns="http://www.springframework.org/schema/beans" ... xmlns:jms="http://www.springframework.org/schema/jms" xmlns:amq="http://activemq.apache.org/schema/core" xsi:schemaLocation="http://www.springframework.org/schema/beans ... http://www.springframework.org/schema/jms http://www.springframework.org/schema/jms/spring-jms.xsd http://activemq.apache.org/schema/core http://activemq.apache.org/schema/core/activemq-core.xsd"> ... <amq:broker useJmx="false" persistent="false"> <amq:transportConnectors> <amq:transportConnector uri="tcp://localhost:0" /> </amq:transportConnectors> </amq:broker> <amq:queue id="jms/OrderQueue" physicalName="queue.OrderQueue"/> <amq:connectionFactory id="connectionFactory" brokerURL="vm://localhost"/> <jms:listener-container transaction-manager="transactionManager" concurrency="3-5"> <jms:listener destination="jms/OrderQueue" ref="orderProcessor"/> </jms:listener-container> </beans>
  23. 23. Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Public23 JMS 2 Message Sender @Stateless public class OrderService { @Inject private JMSContext jmsContext; @Resource(lookup = "java:global/jms/OrderQueue") private Destination orderQueue; ... public void sendOrder(Order order) { jmsContext.createProducer() .setPriority(HIGH_PRIORITY) .setDisableMessageID(true) .setDisableMessageTimestamp(true) .send(orderQueue, order); } }
  24. 24. Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Public24 Spring JMS Message Sender @Component public class OrderService { private JmsTemplate jmsTemplate; @Resource(name="jms/OrderQueue") private Queue queue; ... @Autowired public void setConnectionFactory( ConnectionFactory connectionFactory) { jmsTemplate = new JmsTemplate(connectionFactory); } @Transactional public void sendOrder(Order order) { jmsTemplate.setExplicitQosEnabled(true); jmsTemplate.setPriority(HIGH_PRIORITY); jmsTemplate.setMessageIdEnabled(false); jmsTemplate.setMessageTimestampEnabled(false); jmsTemplate.convertAndsend(queue, order); } }
  25. 25. Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Public25 EJB3 and Spring Scheduling @Stateless public class NewsLetterGenerator { ... @Schedule(dayOfMonth="Last Tues", month="Jan-May, Sep-Nov", timezone="America/New_York") public void generateMonthlyNewsLetter() { ... } } @Component public class NewsLetterGenerator { ... @Scheduled( cron="0 0 0 ? JAN-MAY,SEP-NOV 3L") public void generateMonthlyNewsLetter() { ... } }
  26. 26. Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Public26 Spring Scheduling Bootstrap <beans xmlns="http://www.springframework.org/schema/beans" ... xmlns:task="http://www.springframework.org/schema/task" xsi:schemaLocation="http://www.springframework.org/schema/beans ... http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task.xsd"> ... <task:annotation-driven scheduler="myScheduler"/> <task:scheduler id="myScheduler" pool-size="10"/> </beans>
  27. 27. Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Public27 Spring Projects
  28. 28. Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Public28 Java EE Ecosystem
  29. 29. Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Public29 CDI Ecosystem Implementations Weld CanDI RuntimesPortable Extensions Tools
  30. 30. Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Public30 CDI Extensions
  31. 31. Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Public31 Decisions, decisions…
  32. 32. Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Public32 A Bird’s Eye View

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