----------------- Spring -----------------

Basic idea of IoC pattern. Benefits.

By applying DI in your projects, you�ll find that your code will

become significantly simpler, easier to understand, and easier to test.

With DI, objects are given their dependencies at creation time

by some third party that coordinates each object in the system. Objects aren�t

expected to create or obtain their dependencies�dependencies are injected into the

objects that need them.

The key benefit of DI�loose coupling. If an object only knows about its

dependencies by their interface (not by their implementation or how they�re

instantiated), then the dependency can be swapped out with a different

implementation without the depending object knowing the difference.

One of the most common ways that a dependency will be swapped out is with a

mock implementation during testing.

What is Spring configuration file? How does it look like?

<?xml version="1.0"encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://www.springframework.org/schema/beans

http://www.springframework.org/schema/beans/spring-beans-3.0.xsd" [...] >

[...]

<bean id="knight"class="com.springinaction.knights.BraveKnight"> <constructor-argref="quest"/> </bean>

<bean id="quest" class="com.springinaction.knights.SlayDragonQuest"/>

[...]

</beans>

Out of the box bean scopes (singleton, prototype, request, session, global session)

singleton Scopes the bean definition to a single instance per Spring container (default).

prototype Allows a bean to be instantiated any number of times (once per use).

request Scopes a bean definition to an HTTP request. Only valid when used with a

web-capable Spring context (such as with Spring MVC).

session Scopes a bean definition to an HTTP session. Only valid when used with a

web-capable Spring context (such as with Spring MVC).

global-session Scopes a bean definition to a global HTTP session. Only valid when used in a portlet context.

What are the types of Dependency Injection Spring supports?

Injecting through constructors

Injecting into bean properties

Autowiring. Types of autowiring.

byName Attempts to match all properties of the autowired bean with beans

that have the same name (or ID) as the properties. Properties for which there�s

no matching bean will remain unwired.

byType Attempts to match all properties of the autowired bean with beans

whose types are assignable to the properties. Properties for which there�s no

matching bean will remain unwired.

constructor Tries to match up a constructor of the autowired bean with

beans whose types are assignable to the constructor arguments.

autodetect Attempts to apply constructor autowiring first. If that fails,

byType will be tried.

What are inner beans.

Inner beans are beans that are defined within the scope of another bean.

Note that the inner beans don�t have an id attribute set. Though it�s perfectly legal

to declare an ID for an inner bean, it�s not necessary because you�ll never refer to the

inner bean by name. This highlights the main drawback of using inner beans: they

can�t be reused. Inner beans are only useful for injection once and can�t be referred

to by other beans.

You may also find that using inner-bean definitions has a negative impact on the

readability of the XML in the Spring context files.

What modules does Spring Framework have?

Spring Framework Runtime

DataAccess/Integration

JDBC ORM OXM JMS

Transactions

Web (MVC/Remoting)

Web Servlet Portlet Struts

AOP Aspects Instumentation

Core Container

Beans Core Context ExpressionLanguage

Test

http://static.springsource.org/spring/docs/3.0.x/spring-framework-reference/html/overview.html

Could you please tell us about Spring? What is the most important feature(s) of Spring?

Lightweight and minimally invasive development with plain old Java objects(POJOs)

Loose coupling through dependency injection and interface orientation

Declarative programming through aspects and common conventions

Boilerplate reduction through aspects and templates

What are ORM�s Spring supports ?

Spring provides support for several persistence frameworks, including Hibernate,

iBATIS, Java Data Objects (JDO), and the Java Persistence API (JPA).

How to integrate Spring and Hibernate using HibernateDaoSupport?

not reccomended http://stackoverflow.com/questions/5104765/hibernatedaosupport-is-not-recommended-why

1)configure session factory

<bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation. AnnotationSessionFactoryBean">

<propertyname="dataSource"ref="dataSource"/>

<propertyname="packagesToScan" value="com.habuma.spitter.domain"/>

<propertyname="hibernateProperties">

<props>

<propkey="dialect">org.hibernate.dialect.HSQLDialect</prop>

</props>

</property>

</bean>

2)create dao class by extending HibernateDaoSupport

class ExampleDao extends HibernateDaoSupport {

...

List<aa> bb = (List<aa>)getHibernateTemplate().find("from cc");

}

Use jconsole, hprof, jstat for example.

Same as above

No.