Contents
About ................................................................................................................................................................................... 1
Chapter 1: Getting started with Spring Framework .................................................................................... 2
Section 1.1: Setup (XML Configuration) ........................................................................................................................ 2
Section 1.2: Showcasing Core Spring Features by example ..................................................................................... 3
Section 1.3: What is Spring Framework, why should we go for it? ........................................................................... 6
Chapter 2: Spring Core ............................................................................................................................................... 8
Section 2.1: Introduction to Spring Core ...................................................................................................................... 8
Section 2.2: Understanding How Spring Manage Dependency? ............................................................................. 9
Chapter 3: Spring Expression Language (SpEL) ......................................................................................... 12
Section 3.1: Syntax Reference .................................................................................................................................... 12
Chapter 4: Obtaining a SqlRowSet from SimpleJdbcCall ..................................................................... 13
Section 4.1: SimpleJdbcCall creation ......................................................................................................................... 13
Section 4.2: Oracle Databases ................................................................................................................................... 14
Chapter 5: Creating and using beans .............................................................................................................. 16
Section 5.1: Autowiring all beans of a specific type ................................................................................................. 16
Section 5.2: Basic annotation autowiring ................................................................................................................. 17
Section 5.3: Using FactoryBean for dynamic bean instantiation ........................................................................... 18
Section 5.4: Declaring Bean ....................................................................................................................................... 19
Section 5.5: Autowiring specific bean instances with @Qualifier ........................................................................... 20
Section 5.6: Autowiring specific instances of classes using generic type parameters ........................................ 21
Section 5.7: Inject prototype-scoped beans into singletons ................................................................................... 22
Chapter 6: Bean scopes ........................................................................................................................................... 25
Section 6.1: Additional scopes in web-aware contexts ............................................................................................ 25
Section 6.2: Prototype scope ..................................................................................................................................... 26
Section 6.3: Singleton scope ....................................................................................................................................... 28
Chapter 7: Conditional bean registration in Spring .................................................................................. 30
Section 7.1: Register beans only when a property or value is specified ................................................................ 30
Section 7.2: Condition annotations ............................................................................................................................ 30
Chapter 8: Spring JSR 303 Bean Validation .................................................................................................. 32
Section 8.1: @Valid usage to validate nested POJOs .............................................................................................. 32
Section 8.2: Spring JSR 303 Validation - Customize error messages ................................................................... 32
Section 8.3: JSR303 Annotation based validations in Springs examples .............................................................. 34
Chapter 9: ApplicationContext Configuration .............................................................................................. 37
Section 9.1: Autowiring ................................................................................................................................................ 37
Section 9.2: Bootstrapping the ApplicationContext ................................................................................................. 37
Section 9.3: Java Configuration ................................................................................................................................. 38
Section 9.4: Xml Configuration ................................................................................................................................... 40
Chapter 10: RestTemplate ..................................................................................................................................... 43
Section 10.1: Downloading a Large File ..................................................................................................................... 43
Section 10.2: Setting headers on Spring RestTemplate request ............................................................................ 43
Section 10.3: Generics results from Spring RestTemplate ...................................................................................... 44
Section 10.4: Using Preemptive Basic Authentication with RestTemplate and HttpClient .................................. 44
Section 10.5: Using Basic Authentication with HttpComponent's HttpClient ......................................................... 46
Chapter 11: Task Execution and Scheduling .................................................................................................. 47
Section 11.1: Enable Scheduling ................................................................................................................................... 47
Section 11.2: Cron expression ...................................................................................................................................... 47
, Section 11.3: Fixed delay .............................................................................................................................................. 49
Section 11.4: Fixed Rate ............................................................................................................................................... 49
Chapter 12: Spring Lazy Initialization ............................................................................................................... 50
Section 12.1: Example of Lazy Init in Spring .............................................................................................................. 50
Section 12.2: For component scanning and auto-wiring ......................................................................................... 51
Section 12.3: Lazy initialization in the configuration class ....................................................................................... 51
Chapter 13: Property Source ................................................................................................................................. 52
Section 13.1: Sample xml configuration using PropertyPlaceholderConfigurer .................................................... 52
Section 13.2: Annotation .............................................................................................................................................. 52
Chapter 14: Dependency Injection (DI) and Inversion of Control (IoC) ........................................... 53
Section 14.1: Autowiring a dependency through Java configuration ..................................................................... 53
Section 14.2: Autowiring a dependency through XML configuration ..................................................................... 53
Section 14.3: Injecting a dependency manually through XML configuration ........................................................ 54
Section 14.4: Injecting a dependency manually through Java configuration ...................................................... 56
Chapter 15: JdbcTemplate ..................................................................................................................................... 57
Section 15.1: Basic Query methods ............................................................................................................................ 57
Section 15.2: Query for List of Maps .......................................................................................................................... 57
Section 15.3: SQLRowSet ............................................................................................................................................. 58
Section 15.4: Batch operations ................................................................................................................................... 58
Section 15.5: NamedParameterJdbcTemplate extension of JdbcTemplate ........................................................ 59
Chapter 16: SOAP WS Consumption ................................................................................................................... 60
Section 16.1: Consuming a SOAP WS with Basic auth .............................................................................................. 60
Chapter 17: Spring profile ....................................................................................................................................... 61
Section 17.1: Spring Profiles allows to configure parts available for certain environment .................................. 61
Chapter 18: Understanding the dispatcher-servlet.xml .......................................................................... 62
Section 18.1: dispatcher-servlet.xml ........................................................................................................................... 62
Section 18.2: dispatcher servlet configuration in web.xml ....................................................................................... 62
Credits .............................................................................................................................................................................. 64
You may also like ........................................................................................................................................................ 65
,Chapter 1: Getting started with Spring
Framework
Version Release Date
5.0.x 2017-10-24
4.3.x 2016-06-10
4.2.x 2015-07-31
4.1.x 2014-09-14
4.0.x 2013-12-12
3.2.x 2012-12-13
3.1.x 2011-12-13
3.0.x 2009-12-17
2.5.x 2007-12-25
2.0.x 2006-10-04
1.2.x 2005-05-13
1.1.x 2004-09-05
1.0.x 2003-03-24
Section 1.1: Setup (XML Configuration)
Steps to create Hello Spring:
1. Investigate Spring Boot to see if that would better suit your needs.
2. Have a project set up with the correct dependencies. It is recommended that you are using Maven or Gradle.
3. create a POJO class, e.g. Employee.java
4. create a XML file where you can define your class and variables. e.g beans.xml
5. create your main class e.g. Customer.java
6. Include spring-beans (and its transitive dependencies!) as a dependency.
Employee.java:
package com.test;
public class Employee {
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public void displayName() {
System.out.println(name);
}
}
beans.xml:
2
, <?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-4.3.xsd">
<bean id="employee" class="com.test.Employee">
<property name="name" value="test spring"></property>
</bean>
</beans>
Customer.java:
package com.test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Customer {
public static void main(String[] args) {
ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
Employee obj = (Employee) context.getBean("employee");
obj.displayName();
}
}
Section 1.2: Showcasing Core Spring Features by example
Description
This is a self-contained running example including/showcasing: minimum dependencies needed, Java Configuration,
Bean declaration by annotation and Java Configuration, Dependency Injection by Constructor and by Property, and
Pre/Post hooks.
Dependencies
These dependencies are needed in the classpath:
1. spring-core
2. spring-context
3. spring-beans
4. spring-aop
5. spring-expression
6. commons-logging
Main Class
Starting from the end, this is our Main class that serves as a placeholder for the main() method which initialises the
Application Context by pointing to the Configuration class and loads all the various beans needed to showcase
particular functionality.
package com.stackoverflow.documentation;
import org.springframework.context.ApplicationContext;
3
About ................................................................................................................................................................................... 1
Chapter 1: Getting started with Spring Framework .................................................................................... 2
Section 1.1: Setup (XML Configuration) ........................................................................................................................ 2
Section 1.2: Showcasing Core Spring Features by example ..................................................................................... 3
Section 1.3: What is Spring Framework, why should we go for it? ........................................................................... 6
Chapter 2: Spring Core ............................................................................................................................................... 8
Section 2.1: Introduction to Spring Core ...................................................................................................................... 8
Section 2.2: Understanding How Spring Manage Dependency? ............................................................................. 9
Chapter 3: Spring Expression Language (SpEL) ......................................................................................... 12
Section 3.1: Syntax Reference .................................................................................................................................... 12
Chapter 4: Obtaining a SqlRowSet from SimpleJdbcCall ..................................................................... 13
Section 4.1: SimpleJdbcCall creation ......................................................................................................................... 13
Section 4.2: Oracle Databases ................................................................................................................................... 14
Chapter 5: Creating and using beans .............................................................................................................. 16
Section 5.1: Autowiring all beans of a specific type ................................................................................................. 16
Section 5.2: Basic annotation autowiring ................................................................................................................. 17
Section 5.3: Using FactoryBean for dynamic bean instantiation ........................................................................... 18
Section 5.4: Declaring Bean ....................................................................................................................................... 19
Section 5.5: Autowiring specific bean instances with @Qualifier ........................................................................... 20
Section 5.6: Autowiring specific instances of classes using generic type parameters ........................................ 21
Section 5.7: Inject prototype-scoped beans into singletons ................................................................................... 22
Chapter 6: Bean scopes ........................................................................................................................................... 25
Section 6.1: Additional scopes in web-aware contexts ............................................................................................ 25
Section 6.2: Prototype scope ..................................................................................................................................... 26
Section 6.3: Singleton scope ....................................................................................................................................... 28
Chapter 7: Conditional bean registration in Spring .................................................................................. 30
Section 7.1: Register beans only when a property or value is specified ................................................................ 30
Section 7.2: Condition annotations ............................................................................................................................ 30
Chapter 8: Spring JSR 303 Bean Validation .................................................................................................. 32
Section 8.1: @Valid usage to validate nested POJOs .............................................................................................. 32
Section 8.2: Spring JSR 303 Validation - Customize error messages ................................................................... 32
Section 8.3: JSR303 Annotation based validations in Springs examples .............................................................. 34
Chapter 9: ApplicationContext Configuration .............................................................................................. 37
Section 9.1: Autowiring ................................................................................................................................................ 37
Section 9.2: Bootstrapping the ApplicationContext ................................................................................................. 37
Section 9.3: Java Configuration ................................................................................................................................. 38
Section 9.4: Xml Configuration ................................................................................................................................... 40
Chapter 10: RestTemplate ..................................................................................................................................... 43
Section 10.1: Downloading a Large File ..................................................................................................................... 43
Section 10.2: Setting headers on Spring RestTemplate request ............................................................................ 43
Section 10.3: Generics results from Spring RestTemplate ...................................................................................... 44
Section 10.4: Using Preemptive Basic Authentication with RestTemplate and HttpClient .................................. 44
Section 10.5: Using Basic Authentication with HttpComponent's HttpClient ......................................................... 46
Chapter 11: Task Execution and Scheduling .................................................................................................. 47
Section 11.1: Enable Scheduling ................................................................................................................................... 47
Section 11.2: Cron expression ...................................................................................................................................... 47
, Section 11.3: Fixed delay .............................................................................................................................................. 49
Section 11.4: Fixed Rate ............................................................................................................................................... 49
Chapter 12: Spring Lazy Initialization ............................................................................................................... 50
Section 12.1: Example of Lazy Init in Spring .............................................................................................................. 50
Section 12.2: For component scanning and auto-wiring ......................................................................................... 51
Section 12.3: Lazy initialization in the configuration class ....................................................................................... 51
Chapter 13: Property Source ................................................................................................................................. 52
Section 13.1: Sample xml configuration using PropertyPlaceholderConfigurer .................................................... 52
Section 13.2: Annotation .............................................................................................................................................. 52
Chapter 14: Dependency Injection (DI) and Inversion of Control (IoC) ........................................... 53
Section 14.1: Autowiring a dependency through Java configuration ..................................................................... 53
Section 14.2: Autowiring a dependency through XML configuration ..................................................................... 53
Section 14.3: Injecting a dependency manually through XML configuration ........................................................ 54
Section 14.4: Injecting a dependency manually through Java configuration ...................................................... 56
Chapter 15: JdbcTemplate ..................................................................................................................................... 57
Section 15.1: Basic Query methods ............................................................................................................................ 57
Section 15.2: Query for List of Maps .......................................................................................................................... 57
Section 15.3: SQLRowSet ............................................................................................................................................. 58
Section 15.4: Batch operations ................................................................................................................................... 58
Section 15.5: NamedParameterJdbcTemplate extension of JdbcTemplate ........................................................ 59
Chapter 16: SOAP WS Consumption ................................................................................................................... 60
Section 16.1: Consuming a SOAP WS with Basic auth .............................................................................................. 60
Chapter 17: Spring profile ....................................................................................................................................... 61
Section 17.1: Spring Profiles allows to configure parts available for certain environment .................................. 61
Chapter 18: Understanding the dispatcher-servlet.xml .......................................................................... 62
Section 18.1: dispatcher-servlet.xml ........................................................................................................................... 62
Section 18.2: dispatcher servlet configuration in web.xml ....................................................................................... 62
Credits .............................................................................................................................................................................. 64
You may also like ........................................................................................................................................................ 65
,Chapter 1: Getting started with Spring
Framework
Version Release Date
5.0.x 2017-10-24
4.3.x 2016-06-10
4.2.x 2015-07-31
4.1.x 2014-09-14
4.0.x 2013-12-12
3.2.x 2012-12-13
3.1.x 2011-12-13
3.0.x 2009-12-17
2.5.x 2007-12-25
2.0.x 2006-10-04
1.2.x 2005-05-13
1.1.x 2004-09-05
1.0.x 2003-03-24
Section 1.1: Setup (XML Configuration)
Steps to create Hello Spring:
1. Investigate Spring Boot to see if that would better suit your needs.
2. Have a project set up with the correct dependencies. It is recommended that you are using Maven or Gradle.
3. create a POJO class, e.g. Employee.java
4. create a XML file where you can define your class and variables. e.g beans.xml
5. create your main class e.g. Customer.java
6. Include spring-beans (and its transitive dependencies!) as a dependency.
Employee.java:
package com.test;
public class Employee {
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public void displayName() {
System.out.println(name);
}
}
beans.xml:
2
, <?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-4.3.xsd">
<bean id="employee" class="com.test.Employee">
<property name="name" value="test spring"></property>
</bean>
</beans>
Customer.java:
package com.test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Customer {
public static void main(String[] args) {
ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
Employee obj = (Employee) context.getBean("employee");
obj.displayName();
}
}
Section 1.2: Showcasing Core Spring Features by example
Description
This is a self-contained running example including/showcasing: minimum dependencies needed, Java Configuration,
Bean declaration by annotation and Java Configuration, Dependency Injection by Constructor and by Property, and
Pre/Post hooks.
Dependencies
These dependencies are needed in the classpath:
1. spring-core
2. spring-context
3. spring-beans
4. spring-aop
5. spring-expression
6. commons-logging
Main Class
Starting from the end, this is our Main class that serves as a placeholder for the main() method which initialises the
Application Context by pointing to the Configuration class and loads all the various beans needed to showcase
particular functionality.
package com.stackoverflow.documentation;
import org.springframework.context.ApplicationContext;
3
