Tuesday, 4 December 2018

Spring AOP AspectJ throws Advice example using XML configuration | Spring Tutorial


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Spring AOP AspectJ throws Advice example using XML configuration | Spring Tutorial

Spring AOP AspectJ throws Advice example using XML configuration | Spring Tutorial

Spring AOP AspectJ throws Advice example using XML configuration | Spring Tutorial
pom.xml

<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/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.ram.core</groupId>
    <artifactId>SpringDemo</artifactId>
    <packaging>jar</packaging>
    <version>1.0-SNAPSHOT</version>
    <name>SpringDemo</name>
    <url>http://maven.apache.org</url>

    <properties>
        <spring.version>5.0.5.RELEASE</spring.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>

        <!-- Spring 5 dependencies -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <!-- Spring AOP + AspectJ -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>${spring.version}</version>
        </dependency>
       
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjrt</artifactId>
            <version>1.9.1</version>
        </dependency>
       
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.9.1</version>
        </dependency>

    </dependencies>

</project>

EmployeeService.java

package com.ram.service;

public class EmployeeService
{
    public String addEmployee()
    {
        System.out.println("addEmployee() is called");
        String name = null;
        name.toLowerCase();
        return "Employee Peter information is added successfully";
    }
   
    public void modifyEmployee()
    {
        System.out.println("modifyEmployee() is called");
    }
   
    public void deleteEmployee()
    {
        System.out.println("deleteEmployee() is called");
    }

}

LoggingAspect.java

package com.ram.Aspect;

import org.aspectj.lang.JoinPoint;

public class LoggingAspect
{
    public void logAfterThrowing(JoinPoint joinPoint,
            Throwable exception)
    {

        System.out.print("logAfterThrowing() is running!");
        System.out.println(
                ", after " + joinPoint.getSignature().getName()
                        + " method throwing exception");
        System.out.println("exception = " + exception);
        System.out.println("******");
    }

}

applicationContext.xml

<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"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-4.3.xsd
    http://www.springframework.org/schema/aop
    http://www.springframework.org/schema/aop/spring-aop-4.3.xsd">


    <bean id="employeeService" class="com.ram.service.EmployeeService"></bean>

    <!-- Aspect -->
    <bean id="logAspect" class="com.ram.Aspect.LoggingAspect" />

    <aop:config>
        <aop:aspect id="aspectLoggging" ref="logAspect">
            <!-- @AfterThrowing -->
            <aop:pointcut id="pointCutAfterThrowing"
                expression="execution(* com.ram.service.EmployeeService.addEmployee()))" />

            <aop:after-throwing method="logAfterThrowing"
                throwing="exception" pointcut-ref="pointCutAfterThrowing" />
        </aop:aspect>
    </aop:config>

</beans>

App.java

package com.ram.core;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.ram.service.EmployeeService;

public class App
{
    public static void main(String[] args)
    {
        ApplicationContext context = new ClassPathXmlApplicationContext(
                "applicationContext.xml");

        System.out.println("---------------------------------------");

        EmployeeService employeeService = context.getBean("employeeService",
                EmployeeService.class);

        try
        {
            employeeService.addEmployee();
        }
        catch (Exception exe)
        {
            System.out.println("exception message  = " + exe.getMessage());
        }

        employeeService.modifyEmployee();

        employeeService.deleteEmployee();

    }

}

Output

Nov 13, 2018 9:38:13 AM org.springframework.context.support.AbstractApplicationContext prepareRefresh
INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@32709393: startup date [Tue Nov 13 09:38:13 IST 2018]; root of context hierarchy
Nov 13, 2018 9:38:13 AM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from class path resource [applicationContext.xml]
---------------------------------------
addEmployee() is called
logAfterThrowing() is running!, after addEmployee method throwing exception
exception = java.lang.NullPointerException
******
exception message  = null
modifyEmployee() is called
deleteEmployee() is called

Click the below link to download the code:
https://sites.google.com/site/ramj2eev2/java_basics/SpringDemo_throws_advice_xml_config.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/javaee/tree/master/Spring_2018/SpringDemo_throws_advice_xml_config

Bitbucket Link:
https://bitbucket.org/ramram43210/spring/src/6bb2ff720fe1441184ee161a1a41ebd747f549ef/Spring_2018/SpringDemo_throws_advice_xml_config/?at=master

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