spring-boot- #AfterThrowing is not executing advice method though exception is thrown? - spring-boot

Question

I am new to Spring-boot and AOP. I am trying to log the exceptions raised in my spring-boot application. What exactly i am trying to do is whenever any method in my application classes raises the runtime exception, i am logging it to console.
So i created an aspect with #AfterThrowing annotation. To check whether it is working i have intentionally written a line of code which will raise / by zero exception. I tested with it but this advice method is not working.
Following is my test code:
package com.sware.SpringBoot_JPA_MySQL_Gradle_Project.aspects;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.AfterThrowing;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.springframework.stereotype.Component;
import com.sware.SpringBoot_JPA_MySQL_Gradle_Project.domains.User;
#Aspect
#Component
public class UserAspect {
#Before("execution(* com.sware.SpringBoot_JPA_MySQL_Gradle_Project.services.UserService.saveUserToDb(com.sware.SpringBoot_JPA_MySQL_Gradle_Project.domains.User)) && args(user)")
public void beforeUserSave(User user) {
System.out.println("++++++++++++++++++++++++++++++Creating UserBefore Pointcut: \n"+user.toString());
}
#After("execution(* com.sware.SpringBoot_JPA_MySQL_Gradle_Project.services.UserService.saveUserToDb(com.sware.SpringBoot_JPA_MySQL_Gradle_Project.domains.User)) && args(user)")
public void aftereUserSave(User user) {
System.out.println("++++++++++++++++++++++++++++++Creating User After pointcut: \n"+user.toString());
}
#AfterThrowing(pointcut = "execution(* com.sware.SpringBoot_JPA_MySQL_Gradle_Project.services.*.*(..))", throwing = "e")
public void myAfterThrowing(JoinPoint joinPoint, Throwable e) {
System.out.println("Okay - we're in the handler...");
/*Signature signature = joinPoint.getSignature();
String methodName = signature.getName();
String stuff = signature.toString();
String arguments = Arrays.toString(joinPoint.getArgs());
System.out.println("**************************EXCEPTION: "
+ methodName + " with arguments "
+ arguments + "\nand the full toString: " + stuff + "\nthe exception is: "
+ e.getMessage());*/
}
}
i have tried multiple permutations of pointcut expression like bellow,but no one works:
#AfterThrowing(pointcut = "execution(* com.sware.SpringBoot_JPA_MySQL_Gradle_Project.services.*.*(..))", throwing = "e")
#AfterThrowing(pointcut = "execution(* *.*(..))", throwing = "e") // Application fails to start throws some internal null pointer exception
#AfterThrowing(pointcut = "execution(* com.sware.*.*.*.*(..))", throwing = "e")
My Class Code:
package com.sware.SpringBoot_JPA_MySQL_Gradle_Project.services;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Date;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.sware.SpringBoot_JPA_MySQL_Gradle_Project.domains.User;
import com.sware.SpringBoot_JPA_MySQL_Gradle_Project.projections.UserWithFnameAndLname;
import com.sware.SpringBoot_JPA_MySQL_Gradle_Project.repositories.UserRepository;
#Service
public class UserService {
#Autowired
UserRepository userRepository;
public List<User> getAllUsers(){
List<User> userList=new ArrayList<>();
try {
Integer n=10/0;
userList=userRepository.findAll();
} catch (Exception e) {
System.out.println("Exception in UserRepostory:"+e.getMessage());
}
return userList;
}
}
Here, myAfterThrowing method is not getting call though /by zero is thrown at run time. Can anyone tell me where i am going wrong?

Answer 1

Method does not not throw any exception. The "try-catch" block basically absorbs the exception. Move "Integer n=10/0;" outside of the try-catch