• First Spring+Hibernate Application in IntelliJ

From: http://sitestree.com/?p=4926
Categories:Java Short Notes
Tags:
Post Data:2006-08-17 07:59:04

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• Requirements: JDK 1.4.2 (or above), Tomcat 5.0+, Ant 1.6.1+
• Also, you can use cygwin in windows to emulate linux like commands
• set JAVA_HOME, ANT_HOME, CATALINA_HOME environment variables – paths to the installed software
• Add to PATH: JAVA_HOME/bin, ANT_HOME/bin, CATALINA_HOME/bin
• You can start with the minimal application like struts-blanke.war or webapp-minimal that contains the basic files for struts and spring frameworks respectively. Or start with a equinox download from https://equinox.dev.java.net/files/documents/1901/5728/equinox-1.0.zip that will simplify strut-spring integration/switching. Download and unzip
• Make sure that the environment variables are set properly. Take a look at build.xml file. Check different sections like compile, distribution, ant-tomcat, help, database
• run ant new -Dapp.name=users from windows/linux/cygwin command prompt. It will create a new application with name users.
• Check the directory structure. It should look like as follows:
• under newly created users directory run commands like ant and check output. In build.xml, change default=”help” to default=”compile”, run ant again, run ant deploy, play with different ant commands
• if ant command shows error messages then you may need to change build.xml file as indicated. With equinox, you may face path error like {…}/common/lib or {…} lib
• If things don’t work right, check build.properties and modify the options if required. Play again
• Also, check tomcatTasks.properties file to see what classes are used for different ant commands (used in the build.xml file)
• Run ant list to check the services running. if the command fails, check that build.properties file contains right information. Make sure tomcat-users.xml file under the Tomcat installation directory has an entry for users as provided in the build.properties file
• Make sure, you are under the users directory
• run: ant deploy : the users application will be deployed under Tomcat. Check target name=deploy section in your build.xml file. You will see what actually happens in deployment (mostly copy)
• Using your browser, go to: http://localhost:8080/users/, you will see the interface of the users application
• Unit Test Persistence Layer
• Hibernate for persistence
• Hibernate relates Java Objects to database tables, makes CRUD (Create, Read, Update, Delete) very easy
• Spring + Hibernate: 75% code reduction than Hibernate alone: [ref:Internet, sourcebeat.com]
• Spring + Hibernate: removal of a ServiceLocator, removal of several DAOFactory classes, replace Hibernate’s checked exceptions with Spring’s runtime exceptions
• Before proceeding further, you may want to open the application using Eclipse. You can also use any editor to create Java files.
• Eclipse 3.3.2: How to open the project: File->new->project->java->java project->create project from existing source->identify the location and provide project name as users->you may want to switch to java perspectives.
• Click on build.xml file. Right click -> run as -> 2 Ant Build. If compilation fails: change basedir to the application directory. If it fails again check, tomcat directories and the directories mentioned in the build.xml files are the same. [you may not need /server in build.xml for tomcat 6.o]
• Check: build.xml -> right click -> Run As -> 3. Ant Build -> check that you selected the operation you want. If you want to deploy your application after compilation you need to select compile, deploy. Check what else apply. Or you can use the ant command [with options] from the command prompt
• Now Hibernate and Persistence again:

From: http://sitestree.com/?p=4924
Categories:Java Short Notes
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Post Data:2006-12-25 08:52:32

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• Open-sourced on February, 2003
• Layered J2EE application framework
• Inversion of Control (IoC): A Data Access Object (DAO) depends on a DataSource.
• Allows: code to interfaces
• Spring has classes to support Hibernate, Struts, and other frameworks
• According to many Java developers [ref:internet], J2EE patterns are sometimes cumbersome. Spring uses patterns but made everything simpler
• ServiceLocator -> to lookup Hibernate sessions. Spring Alternative: configure a SessionFactory
• Spring provides/supports good programming practices such as, coding to interfaces, reducing coupling, easy testability.
• But EJBs require to run EJB containers (WebLogic, JBoss, Websphere) to test them [testability problems inherent in EJBs] [as of 2005]
• Over the time EJB [EJB 3.0 ] has recovered some of the issues like testability, portability [ 1. EJB 2.0 has deployment descriptors but EJB 3.0 has no deployment descriptor, 2. In EJB 2.0 you have to write Home and Remote Interfaces But in EJB3.0 you do not need to write Home interfaces, 3. In EJB 3.0, all entities are identified with ‘@’, 4. In EJB 3.0 methods like ejbPassivate, ejbActivate, ejbLoad, ejbStore, etc. are not required, 5. EJB 3.0 is totally newly designed including the entity manager, 6. EJB 3.0 entity beans are just POJO, 7. No EJB container required to run, 8. EJB 3.0 supports Java Persistence API for all of its data needs, 9. No XMLDeployment Descriptors but annotations, 10. EJB 3.0 entity beans/JPA becomes local, 11. Queries are very flexible. Multiple levels of joins are enabled, 12. EJB 3.0 pluggable, security enabled ]
• Spring Criticisms [as of 2005]: It’s not an standard like EJBs, too heavyweight (though custom selection of modules/jars will help)
• How Spring works: Spring can configure applications using JavaBeans. A class can expose it’s dependency through setters, Spring can configure that dependency.
• Inversion of Control/Dependency Injection: Wiring dependent objects together through a container
• Spring Modules: Spring AOP (source level metadata), ORM (Hibernate, iBATIS, JDO support), Spring Web (WebApplicationContext, MultipartResolver, Web Utilities), DAO (Transaction Infrastructure, JDBC, DAO support), Context (ApplicationContext, UI Support, Validation, JNDI, EJB, Remoting support, Mail), MVC (Web Framework, Web Views, JSP, Velocity, Freemarker, PDF, Excel, XML/XSL)
• Spring advantage over J2EE: Reducing Coupling: It’s better not to tightly couple any application to a specific resource. In J2EE, for database operations typically an abstract Factory class (DAOFactory) is defined and a class is written for each specific implementation (DAOFactoryOracle). [J2EE Factory Pattern]. It creates additional issues such as managing dependencies of these factoried objects, handling Hibernate Session
• Spring approach: bind interfaces to implementations, configure everything in an XML file, and modify the XML file as required for switching, unit tests can be written without the knowledge of the implementation [great with Hibernate and iBATIS] p30. Define the bean in the applicationContext.xml file, and use it from your code through ClassPathXmlApplicationContext, get a reference to the bean using ClassPathXmlApplicationContext.getBean. You can change the class property in the bean definition to use a different implementation
• You can use Hibernate from Spring (ORM support). If you go through wrapping classes of Spring to provide Hibernate functionalities, you will not require to worry about (try, catch) checked exceptions that Hibernate usually throws

From: http://sitestree.com/?p=4923
Categories:Java Short Notes
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Post Data:2006-10-26 16:03:22

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Java Spring Topics
Knowing the buzzwords does not make anyone a good developer. However, it helps. Being expert in a technology like Spring in one day is not possible, but initially getting familiar with all the aspects is helpful as you will know which Spring feature is required to solve the current problem/situation. Then you can just explore and use that feature. It can always help the software engineers/software architects/project managers/product managers – as it will help to select technologies to use.

• Traditional way of resolving dependencies – binding interfaces to implementations using a Factory Pattern: Spring does it all using XML.
• How to write a simple Spring web application: Struts MVC as the front-end, Spring as the middle-tier, Hibernate for the back-end.
• BeanFactory: the heart of Spring. Topics to learn: BeanFactory Life Cycle, bean definitions, bean properties, dependencies, autowiring, making singleton beans versus prototypes, inversion of control
• Spring MVC framework: DispatcherServlet, various controllers, handler mappings, view resolvers, validation and internationalization, Spring’s JSP tags
• Advanced MVC: validation and page decoration, Tiles and SiteMesh to decorate a web application, handling validation and using it in the web business layers, handling exceptions in the control layers, upload files, and send emails
• View Options: JSP, Velocity, FreeMarker, XSLT, PDF and Excel
• JasperReports: open source Java reporting tool, excellent tool for rendering printable pages. Supports: PDF, HTML, XLS, CSV, XML
• Persistence Strategies: Hibernate, JDBC or iBATIS (if database or pre-written sqls are already there)
• Testing Spring Applications: test-driven spring development. Tools: Easy-Mock, jMock, DBUnit. Controller testing: Cactus for in-container testing, Spring Mocks for Out of container testing. jWebUnit and Canoo’s WebTest for testing web interface
• AOP: Aspect Oriented Programming
• Transactions: How spring simplifies declarative and programmatic transactions
• How to integrate other web-framework into Spring. Web-frameworks: JSF, Struts, Tapestry, WebWork
• Security: Authentication and authorization using traditional container managed J2EE security features and Acegi Security Framework for Spring. Acegi: protect and prevent method invocations on Spring managed beans, configure Access Control Lists (ACLs)
• Advanced Form Processing: Using forms and handling common issues (handling non-String types like Integer, Date, and Boolean, drop down lists, check boxes, editing nested objects). Multi-page forms: AbstractWizardFormController, Spring Web Flow

From: http://sitestree.com/?p=4921
Categories:Java Short Notes
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Post Data:2010-05-08 00:57:04

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Spring Resources ……… …… . …. . . . . . .. . . . . . . . . . . . . . .. . . . . . . . . ..
• Step by step Spring
• Spring Tutorial: Just OK
• Spring Tutorial
• Spring Tutorial

From: http://sitestree.com/?p=4914
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Post Data:2009-04-21 06:03:06

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• equinox-jsf-ch11-completed.tar.gz
• equinox-jsf-ch11-completed.zip
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• myusers-ch9.zip

From: http://sitestree.com/?p=4913
Categories:Java Short Notes
Tags:
Post Data:2006-11-11 03:02:48

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