Spring is a very popular IOC (Inversion Of Control) container with support for. AOP, Hibernate etc. Tutorial 4 – Hibernate, HSQL Database, Maven and Eclipse. J2EE Reality Check. ▫Common Technology Stack. – Spring (IoC). – Hibernate (Light-Weight Persistence). – Stateless EJB. Spring+Hibernate. Spring and Hibernate. Version _ Information in this document is subject to change without notice. Companies, names and data used in.
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Place Spring bean configuration files under a folder instead of root folder 1 .. 8 Spring MVC Hibernate Tutorial. Introduction. PDF | Web application frameworks and ORM tools reduce time and effort needed when Hibernate y spring - un análisis mantenibilidad contra desempeño. Spring Hibernate combination is widely used across industry. Below is Output as PDF file has been powered by [ Universal Post Manager ] plugin from www.
The Spring context is a configuration file that provides context information to the Spring framework. Spring AOP: The Spring AOP module integrates aspect-oriented programming functionality directly into the Spring framework, through its configuration management feature. As a result you can easily AOP-enable any object managed by the Spring framework. The Spring AOP module provides transaction management services for objects in any Spring-based application.
Spring DAO: The Spring JDBC DAO abstraction layer offers a meaningful exception hierarchy for managing the exception handling and error messages thrown by different database vendors. The exception hierarchy simplifies error handling and greatly reduces the amount of exception code you need to write, such as opening and closing connections.
Spring ORM: Spring Web module: The Web context module builds on top of the application context module, providing contexts for Web-based applications. As a result, the Spring framework supports integration with Jakarta Struts.
The Web module also eases the tasks of handling multi-part requests and binding request parameters to domain objects. Spring MVC framework: What is AOP? How does it relate with IOC?
What are different tools to utilize AOP? Aspect-oriented programming, or AOP, is a programming technique that allows programmers to modularize crosscutting concerns, or behavior that cuts across the typical divisions of responsibility, such as logging and transaction management.
AOP and IOC are complementary technologies in that both apply a modular approach to complex problems in enterprise application development.
In a typical object-oriented development approach you might implement logging functionality by putting logger statements in all your methods and Java classes. In an AOP approach you would instead modularize the logging services and apply them declaratively to the components that required logging. The advantage, of course, is that the Java class doesn't need to know about the existence of the logging service or concern itself with any related code. As a result, application code written using Spring AOP is loosely coupled.
However AspectJ works at he byte code level and you need to use AspectJ compiler to get the AOP features built into your compiled code. Nevertheless AOP functionality is fully integrated into the Spring context for transaction management, logging, and various other features.
In general any AOP framework control aspects in three possible ways:. Points in a program's execution. For example, joinpoints could define calls to specific methods in a class Pointcuts: Program constructs to designate joinpoints and collect specific context at those points Advices: Code that runs upon meeting certain conditions. For example, an advice could log a message before executing a joinpoint.
What are the advantages of spring framework?
Use what you need and leave you don't need now. There is no behind the scene magic here. POJO programming enables continuous integration and testability. Explain BeanFactory in spring. Bean factory is an implementation of the factory design pattern and its function is to create and dispense beans. As the bean factory knows about many objects within an application, it is able to create association between collaborating objects as they are instantiated.
This removes the burden of configuration from the bean and the client. There are several implementation of BeanFactory. The most useful one is "org.
The resource will provide the XML to the factory. But the bean factory doesn't instantiate the bean yet. To retrieve a bean from a 'BeanFactory', the getBean method is called.
When getBean method is called, factory will instantiate the bean and begin setting the bean's properties using dependency injection. Explain the role of ApplicationContext in spring.
While Bean Factory is used for simple applications, the Application Context is spring's more advanced container. Like 'BeanFactory' it can be used to load bean definitions, wire beans together and dispense beans upon request.
It also provide. Because of additional functionality, 'Application Context' is preferred over a BeanFactory. Only when the resource is scarce like mobile devices, 'BeanFactory' is used. The three commonly used implementation of 'Application Context' are. It Loads context definition from an XML file located in the classpath, treating context definitions as classpath resources.
It loads context definition from an XML file in the filesystem. It loads context definition from an XML file contained within a web application. How does Spring supports DAO in hibernate? It has handy methods you can call to get a Hibernate Session, or a SessionFactory.
The most convenient method is getHibernateTemplate , which returns a HibernateTemplate. This template wraps Hibernate checked exceptions with runtime exceptions, allowing your DAO interfaces to be Hibernate exception- free. What are the id generator classes in hibernate? It generates identifiers of type long, short or int that are unique only when no other process is inserting data into the same table. It should not the used in the clustered environment.
The returned identifier is of type long, short or int. The returned identifier is of type long, short or int hilo: Do not use this generator with connections enlisted with JTA or with a user-supplied connection. The uuid generator uses a bit UUID algorithm to generate identifiers of type string, unique within a network the IP address is used.
The UUID is encoded as a string of hexadecimal digits of length It picks identity, sequence or hilo depending upon the capabilities of the underlying database.
How is a typical spring implementation look like? For a typical Spring Application we need the following files 1. An interface that defines the functions. An Implementation that contains properties, its setter and getter methods, functions etc.
A XML file called Spring configuration file. Client program that uses the function. How do you define hibernate mapping file in spring? How do you configure spring in a web application?
It is very easy to configure any J2EE-based web application to use Spring. Can you have xyz. How do you configure your database driver in spring? Using datasource "org. How can you configure JNDI instead of datasource in spring applicationcontext. If the entity is already present in the database, it is updated. Else, it is inserted. Example 1 - Relationships ManyToMany Relationships between objects are expressed in a different way compared to relationship between tables.
Each Employee can have multiple Tasks.
Each Task can be shared by multiple Employees. There is a Many to Many relationship between them. We use ManyToMany annotation to establish the relationship. In these situations, we define a inheritance strategy.
In this example, we use a strategy of InheritanceType. Next Steps. Entity; import javax. GeneratedValue; import javax. Id; import javax. Lob; import javax. The first property in this class on line 20 is our object ID which will be unique for all events persisted. The GeneratedValue annotation says that this value will be determined by the datasource, not by the code. List; import net. Document; import org. HibernateException; import org. Session; import org. SessionFactory; import org.
Autowired; import org. Repository; import org. Used in download functionality to download a stored document from database. Note that we have used two Spring annotations Repository and Autowired. Classes marked with annotations are candidates for auto-detection by Spring when using annotation-based configuration and classpath scanning. The Repository annotation is yet another stereotype that was introduced in Spring 2.
This annotation is used to indicate that a class functions as a repository and needs to have exception translation applied transparently on it.
Also note that we have used Transactional annotation on each method. Ideally the DAO layer is access from a Service layer and transaction management needs to be specified at Service layer. But again for sake of simplicity we will not include service layer in our example and directly call the DAO layer from Spring Controller.
Again, feel free to change this implementation and add your own service layer in between.
Update the web. The database connection details are stored in this file which is used in hibernate connection settings. We provide jdbc driver class, username, password etc in configuration. Also note that in sessionFactory we have specified few hibernate properties such as hibernate.