Spring Assignable Component Annotation Project

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This is ComponentMarker.java file having the source code to execute business logic.

package com.cv.spring.component.assignable; /**  * @author Chandra Vardhan  */ public interface ComponentMarker {      void component();    }

This is Dependency.java file having the source code to execute business logic.

package com.cv.spring.component.assignable; import org.apache.log4j.Logger; import org.springframework.stereotype.Component; import org.springframework.util.ObjectUtils; /**  * @author Chandra Vardhan  */ @Component public class Dependency {      private final static Logger LOGGER = Logger.getLogger(Dependency.class);     @Override     public String toString() {         final StringBuilder sb = new StringBuilder();         sb.append("Dependency : ");         sb.append(ObjectUtils.identityToString(this));         sb.append("{}");         LOGGER.info("toString for Dependency class..."+sb.toString());         return sb.toString();     } }

This is MainProgram.java file having the source code to execute business logic.

package com.cv.spring.component.assignable; import org.apache.log4j.Logger; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; /**  * @author Chandra Vardhan  */ public class MainProgram {   private final static Logger LOGGER = Logger.getLogger(MainProgram.class);   public static void main(String[] args) throws Exception {     ApplicationContext ac = new ClassPathXmlApplicationContext(         "spring-config.xml");     String[] beanNames = ac.getBeanDefinitionNames();     for (String beanName : beanNames) {       Object o = ac.getBean(beanName);       LOGGER.info("Bean object is : " + o);       if (o != null && o instanceof ComponentMarker) {         MarkedBean m = (MarkedBean) o;         m.component();       }     }   } }

This is MarkedBean.java file having the source code to execute business logic.

package com.cv.spring.component.assignable; import org.apache.log4j.Logger; /**  * @author Chandra Vardhan  */ public class MarkedBean implements ComponentMarker {      private final static Logger LOGGER = Logger.getLogger(MarkedBean.class);        @Override     public String toString() {         final StringBuilder sb = new StringBuilder();         sb.append("MarkedBean");         sb.append("{}");                  LOGGER.info("toString for MarkedBean class..."+sb.toString());         return sb.toString();     }   @Override   public void component() {     LOGGER.info("component() called from the MarkedBean class...");   } }

This is pom.xml file having the entries of dependency jars and information to build the application .

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">.0" encoding="UTF-8"?> <modelVersion>4.0.0</modelVersion> <groupId>com.cv.spring.annotation</groupId> <artifactId>SpringAssignableComponentAnnotation</artifactId> <name>SpringAssignableComponentAnnotation</name> <packaging>jar</packaging> <version>1.0</version> <properties> <java-version>1.8</java-version> <log4j-version>1.2.16</log4j-version> <org.springframework-version>4.1.6.RELEASE</org.springframework-version> </properties> <dependencies> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>${org.springframework-version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aop</artifactId> <version>${org.springframework-version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>${org.springframework-version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>${org.springframework-version}</version> </dependency> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>${log4j.version}</version> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>3.1</version> <configuration> <source>1.8</source> <target>1.8</target> </configuration> </plugin> </plugins> </build> </project>

This is spring-config.xml file having the spring configuration properties.

<beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" 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.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <context:component-scan base-package="com.cv.spring.component.assignable"> <context:include-filter type="assignable" expression="com.cv.spring.component.assignable.ComponentMarker"/> </context:component-scan> </beans>

This is log4j.properties file having the entries for logging the information into the console/file.

#By default enabling Console appender # Root logger option log4j.rootLogger=INFO, stdout # Redirect log messages to console log4j.appender.stdout=org.apache.log4j.ConsoleAppender log4j.appender.stdout.Target=System.out log4j.appender.stdout.layout=org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern=%-5p [%c]:%L -->> %m%n # Redirect log messages to a log file #log4j.appender.file=org.apache.log4j.RollingFileAppender #log4j.appender.file.File=C:\servlet-application.log #log4j.appender.file.MaxFileSize=5MB #log4j.appender.file.MaxBackupIndex=10 #log4j.appender.file.layout=org.apache.log4j.PatternLayout #log4j.appender.file.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n