autodetect autowiring in spring
For the System requirements, project required jars and project creation setup steps please refer the below links:-
http://www.javatechtipssharedbygaurav.com/2013/06/spring-beans-autowiring.html
Example of "autodetect" autowiring mode:-
ShoeCompanyDetails.java
package
com.spring.gaurav.autowire.autodetect.example;
public class
ShoeCompanyDetails {
private
String shoeCompanyName;
private
String companyType;
private
String companyHeadquarters;
private
int companyFoundationyear;
public
String getShoeCompanyName() {
return
shoeCompanyName;
}
public
void setShoeCompanyName(String shoeCompanyName) {
this.shoeCompanyName
= shoeCompanyName;
}
public
String getCompanyType() {
return
companyType;
}
public
void setCompanyType(String companyType) {
this.companyType
= companyType;
}
public
String getCompanyHeadquarters() {
return
companyHeadquarters;
}
public
void setCompanyHeadquarters(String companyHeadquarters) {
this.companyHeadquarters
= companyHeadquarters;
}
public
int getCompanyFoundationyear() {
return
companyFoundationyear;
}
public
void setCompanyFoundationyear(int companyFoundationyear) {
this.companyFoundationyear
= companyFoundationyear;
}
}
Shoemaker.java
package
com.spring.gaurav.autowire.autodetect.example;
import
com.spring.gaurav.autowire.autodetect.example.ShoeCompanyDetails;
public class
Shoemaker {
private
String companyFounder;
private
ShoeCompanyDetails shoeCompanyDetails;
public
void displayShoemakerCompanyHistory() {
System.out.println("SHOE
COMPANY NAME :- "
+
shoeCompanyDetails.getShoeCompanyName()
+
", \nCOMPANYFOUNDER NAME :- " + companyFounder + ",");
System.out.println("COMPANY
TYPE :- "
+
shoeCompanyDetails.getCompanyType()
+
", \nCOMPANY HEADQUARTERS :- "
+
shoeCompanyDetails.getCompanyHeadquarters()
+
" \nAND COMPANY FOUNDATION YEAR :- "
+
shoeCompanyDetails.getCompanyFoundationyear());
}
public
Shoemaker(ShoeCompanyDetails shoeCompanyDetails) {
this.shoeCompanyDetails
= shoeCompanyDetails;
}
public
String getCompanyFounder() {
return
companyFounder;
}
/*public
ShoeCompanyDetails getShoeCompanyDetails() {
return
shoeCompanyDetails;
}
public
void setShoeCompanyDetails(ShoeCompanyDetails shoeCompanyDetails) {
this.shoeCompanyDetails
= shoeCompanyDetails;
}*/
public
void setCompanyFounder(String companyFounder) {
this.companyFounder
= companyFounder;
}
}
autowire-mode-autodetect-beans.xml
<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-2.5.xsd">
<bean id="shoemakerBean" class="com.spring.gaurav.autowire.autodetect.example.Shoemaker"
autowire="autodetect">
<property name="companyFounder"
value="AERO GROUP" />
</bean>
<bean id="shoeCompanyDetails" class="com.spring.gaurav.autowire.autodetect.example.ShoeCompanyDetails">
<property name="shoeCompanyName"
value="WOODLAND WORLDWIDE" />
<property name="companyType"
value="SUBSIDIARY" />
<property name="companyHeadquarters"
value="QUEBEC, CANADA " />
<property name="companyFoundationyear"
value="1992"></property>
</bean>
</beans>
AutodetectAutowireClient.java
package
com.spring.gaurav.autowire.autodetect.example;
import
org.springframework.context.ApplicationContext;
import
org.springframework.context.support.ClassPathXmlApplicationContext;
public
class AutodetectAutowireClient {
public static void main(String args[])
{
ApplicationContext
appContext = new ClassPathXmlApplicationContext(
"autowire-mode-autodetect-beans.xml");
Shoemaker
shoemaker = (Shoemaker) appContext.getBean("shoemakerBean");
shoemaker.displayShoemakerCompanyHistory();
}
}
/**
*
Notes: According to "autowire-mode-autodetect-beans.xml" bean file,
we called
*
shoemakerBean in this client program, In the xml bean configuration file, we
*
have declared autowire = autodetect, so according to the autodetect autowire
*
mode first container will try to autowire by constructor of Shoemaker class
*
having ShoeCompanyDetails class as an argument, as we have declared private
*
ShoeCompanyDetails shoeCompanyDetails in Shoemaker.java file, and using the
*
ShoeCompanyDetails class as an argument of Shoemaker class constructor then
*
it injects ShoeCompanyDetails bean class properties which is shoeCompanyName,
*
companyType, companyHeadquarters and companyFoundationyear and injects value
*
of companyFounder property of Shoemaker class. Try to comment the Shoemaker
*
constructor and then uncomment the setter and getter method of
*
ShoeCompanyDetails property in Shoemaker class then execute the client. You
*
will find no difference. As we know in case of autodetect Spring container
*
first attempts to autowire by constructor and then using byType in case if
*
first attempt does not work or falied(autowire by constructor).
*
*/
Result:-
log4j:WARN No appenders
could be found for logger
(org.springframework.context.support.ClassPathXmlApplicationContext).
log4j:WARN Please
initialize the log4j system properly.
SHOE COMPANY NAME :- WOODLAND WORLDWIDE,
COMPANYFOUNDER NAME :- AERO GROUP,
COMPANY TYPE :- SUBSIDIARY,
COMPANY HEADQUARTERS :- QUEBEC, CANADA
AND COMPANY FOUNDATION YEAR :- 1992
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