Code Samples for BAEL-4130 (#9513)

spring-aop/pom.xml

@@ -18,6 +18,11 @@
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-aop</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
 </project>

spring-aop/src/test/java/com/baeldung/undeclared/SomeCheckedException.java

@@ -0,0 +1,7 @@
+package com.baeldung.undeclared;
+
+public class SomeCheckedException extends Exception {
+    public SomeCheckedException(String message) {
+        super(message);
+    }
+}

spring-aop/src/test/java/com/baeldung/undeclared/ThrowUndeclared.java

@@ -0,0 +1,11 @@
+package com.baeldung.undeclared;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Target(ElementType.METHOD)
+@Retention(RetentionPolicy.RUNTIME)
+public @interface ThrowUndeclared {
+}

spring-aop/src/test/java/com/baeldung/undeclared/UndeclaredApplication.java

@@ -0,0 +1,12 @@
+package com.baeldung.undeclared;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class UndeclaredApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(UndeclaredApplication.class, args);
+    }
+}

spring-aop/src/test/java/com/baeldung/undeclared/UndeclaredAspect.java

@@ -0,0 +1,16 @@
+package com.baeldung.undeclared;
+
+import org.aspectj.lang.ProceedingJoinPoint;
+import org.aspectj.lang.annotation.Around;
+import org.aspectj.lang.annotation.Aspect;
+import org.springframework.stereotype.Component;
+
+@Aspect
+@Component
+public class UndeclaredAspect {
+
+    @Around("@annotation(undeclared)")
+    public Object advise(ProceedingJoinPoint pjp, ThrowUndeclared undeclared) throws Throwable {
+        throw new SomeCheckedException("AOP Checked Exception");
+    }
+}

spring-aop/src/test/java/com/baeldung/undeclared/UndeclaredService.java

@@ -0,0 +1,10 @@
+package com.baeldung.undeclared;
+
+import org.springframework.stereotype.Service;
+
+@Service
+public class UndeclaredService {
+
+    @ThrowUndeclared
+    public void doSomething() {}
+}

spring-aop/src/test/java/com/baeldung/undeclared/UndeclaredThrowableExceptionIntegrationTest.java

@@ -0,0 +1,25 @@
+package com.baeldung.undeclared;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import java.lang.reflect.UndeclaredThrowableException;
+
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest(classes = UndeclaredApplication.class)
+public class UndeclaredThrowableExceptionIntegrationTest {
+
+    @Autowired private UndeclaredService service;
+
+    @Test
+    public void givenAnAspect_whenCallingAdvisedMethod_thenShouldWrapTheException() {
+        assertThatThrownBy(service::doSomething)
+          .isInstanceOf(UndeclaredThrowableException.class)
+          .hasCauseInstanceOf(SomeCheckedException.class);
+    }
+}

spring-aop/src/test/java/com/baeldung/undeclared/UndeclaredThrowableExceptionUnitTest.java

@@ -0,0 +1,48 @@
+package com.baeldung.undeclared;
+
+import org.junit.Test;
+
+import java.lang.reflect.InvocationHandler;
+import java.lang.reflect.Method;
+import java.lang.reflect.Proxy;
+import java.lang.reflect.UndeclaredThrowableException;
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+
+public class UndeclaredThrowableExceptionUnitTest {
+
+    @Test
+    @SuppressWarnings("unchecked")
+    public void givenAProxy_whenProxyUndeclaredThrowsCheckedException_thenShouldBeWrapped() {
+        ClassLoader classLoader = getClass().getClassLoader();
+        InvocationHandler invocationHandler = new ExceptionalInvocationHandler();
+        List<String> proxy = (List<String>) Proxy.newProxyInstance(classLoader, new Class[] { List.class }, invocationHandler);
+
+        assertThatThrownBy(proxy::size)
+          .isInstanceOf(UndeclaredThrowableException.class)
+          .hasCauseInstanceOf(SomeCheckedException.class);
+    }
+
+    @Test
+    @SuppressWarnings("unchecked")
+    public void givenAProxy_whenProxyThrowsUncheckedException_thenShouldBeThrownAsIs() {
+        ClassLoader classLoader = getClass().getClassLoader();
+        InvocationHandler invocationHandler = new ExceptionalInvocationHandler();
+        List<String> proxy = (List<String>) Proxy.newProxyInstance(classLoader, new Class[] { List.class }, invocationHandler);
+
+        assertThatThrownBy(proxy::isEmpty).isInstanceOf(RuntimeException.class);
+    }
+
+    private static class ExceptionalInvocationHandler implements InvocationHandler {
+
+        @Override
+        public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
+            if ("size".equals(method.getName())) {
+                throw new SomeCheckedException("Always fails");
+            }
+
+            throw new RuntimeException();
+        }
+    }
+}