Spring @Autowired working without context:annotation-config -
i've tested behavior of auto wiring in case context:annotation-config element missing in application context xml file. surprise worked same.
so here question: how come autowiredannotationbeanpostprocessor registered in applicationcontext though context:annotation-config element missing application context configuration file, or else mechanism makes configuration work?
i'm using spring version 3.0.6.release project pom file:
<?xml version="1.0" encoding="utf-8"?> <project xmlns="http://maven.apache.org/pom/4.0.0" xsi:schemalocation="http://maven.apache.org/pom/4.0.0 http://maven.apache.org/maven- v4_0_0.xsd" xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"> <modelversion>4.0.0</modelversion> <groupid>org.springframework.samples.spring</groupid> <artifactid>spring-utility</artifactid> <version>1.0.0.ci-snapshot</version> <packaging>jar</packaging> <name>spring utility</name> <url>http://www.springframework.org</url> <description> <![cdata[ project minimal jar utility spring configuration. ]]> </description> <properties> <maven.test.failure.ignore>true</maven.test.failure.ignore> <spring.framework.version>3.0.6.release</spring.framework.version> </properties> <dependencies> <dependency> <groupid>junit</groupid> <artifactid>junit</artifactid> <version>4.7</version> <scope>test</scope> </dependency> <dependency> <groupid>org.springframework</groupid> <artifactid>spring-test</artifactid> <version>${spring.framework.version}</version> <scope>test</scope> </dependency> <dependency> <groupid>org.springframework</groupid> <artifactid>spring-context</artifactid> <version>${spring.framework.version}</version> </dependency> <dependency> <groupid>log4j</groupid> <artifactid>log4j</artifactid> <version>1.2.14</version> </dependency> </dependencies> <build> <plugins> <plugin> <groupid>org.apache.maven.plugins</groupid> <artifactid>maven-compiler-plugin</artifactid> <configuration> <source>1.5</source> <target>1.5</target> </configuration> </plugin> </plugins> </build> </project> this application context configuration file, context:annotation-config element commented out:
<?xml version="1.0" encoding="utf-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/xmlschema-instance" xmlns:context="http://www.springframework.org/schema/context" xsi:schemalocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd"> <description>example configuration started.</description> <!-- context:annotation-config/ --> <context:component-scan base-package="com.foo.ch04" /> </beans> a messageprovider, used collaborator dependent bean messagerenderer
package com.foo.ch04.helloworld; import org.springframework.stereotype.service; @service("messageprovider") public class helloworldmessageprovider implements messageprovider { public string getmessage() { return "hello, world!"; } } the messagerenderer, dependency messageprovider gets auto-injected:
package com.foo.ch04.helloworld; import org.springframework.beans.factory.annotation.autowired; import org.springframework.stereotype.service; @service("messagerenderer") public class standardoutmessagerenderer implements messagerenderer { private messageprovider messageprovider; public void render() { if (messageprovider == null) { throw new runtimeexception( "you must set property messageprovider before rendering message."); } system.out.println(messageprovider.getmessage()); } @autowired public void setmessageprovider(messageprovider provider) { messageprovider = provider; } public messageprovider getmessageprovider() { return messageprovider; } } the test application loading application context , testing messagerenderer:
package com.foo.ch04.helloworld; import org.springframework.context.support.genericxmlapplicationcontext; public class declarespringcomponents { public static void main(string[] args) { genericxmlapplicationcontext context = new genericxmlapplicationcontext(); context.load("classpath:meta-inf/spring/app-context-annotation.xml"); context.refresh(); messagerenderer renderer = context.getbean("messagerenderer", messagerenderer.class); renderer.render(); } } even though missing in application context configuration file, message "hello, world!" written stdout when application run.
their functionality overlapping. @ similar question here:
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