Consistent throwing of last UnsatisfiedDependencyException if available and no constructor resolved

Issue: SPR-12543

Author: jhoeller

spring-beans/src/main/java/org/springframework/beans/factory/support/ConstructorResolver.java

@@ -157,7 +157,7 @@ public BeanWrapper autowireConstructor(final String beanName, final RootBeanDefi
 			AutowireUtils.sortConstructors(candidates);
 			int minTypeDiffWeight = Integer.MAX_VALUE;
 			Set<Constructor<?>> ambiguousConstructors = null;
-			List<Exception> causes = null;
+			LinkedList<UnsatisfiedDependencyException> causes = null;
 
 			for (int i = 0; i < candidates.length; i++) {
 				Constructor<?> candidate = candidates[i];
@@ -190,22 +190,12 @@ public BeanWrapper autowireConstructor(final String beanName, final RootBeanDefi
 							this.beanFactory.logger.trace(
 									"Ignoring constructor [" + candidate + "] of bean '" + beanName + "': " + ex);
 						}
-						if (i == candidates.length - 1 && constructorToUse == null) {
-							if (causes != null) {
-								for (Exception cause : causes) {
-									this.beanFactory.onSuppressedException(cause);
-								}
-							}
-							throw ex;
-						}
-						else {
-							// Swallow and try next constructor.
-							if (causes == null) {
-								causes = new LinkedList<Exception>();
-							}
-							causes.add(ex);
-							continue;
+						// Swallow and try next constructor.
+						if (causes == null) {
+							causes = new LinkedList<UnsatisfiedDependencyException>();
 						}
+						causes.add(ex);
+						continue;
 					}
 				}
 				else {
@@ -236,6 +226,13 @@ else if (constructorToUse != null && typeDiffWeight == minTypeDiffWeight) {
 			}
 
 			if (constructorToUse == null) {
+				if (causes != null) {
+					UnsatisfiedDependencyException ex = causes.removeLast();
+					for (Exception cause : causes) {
+						this.beanFactory.onSuppressedException(cause);
+					}
+					throw ex;
+				}
 				throw new BeanCreationException(mbd.getResourceDescription(), beanName,
 						"Could not resolve matching constructor " +
 						"(hint: specify index/type/name arguments for simple parameters to avoid type ambiguities)");

spring-beans/src/test/java/org/springframework/beans/factory/DefaultListableBeanFactoryTests.java

@@ -2023,6 +2023,30 @@ public void testAvoidCircularReferenceThroughAutowiring() {
 		lbf.preInstantiateSingletons();
 	}
 
+	@Test
+	public void testConstructorDependencyWithClassResolution() {
+		DefaultListableBeanFactory lbf = new DefaultListableBeanFactory();
+		RootBeanDefinition bd = new RootBeanDefinition(ConstructorDependencyWithClassResolution.class);
+		bd.getConstructorArgumentValues().addGenericArgumentValue("java.lang.String");
+		lbf.registerBeanDefinition("test", bd);
+		lbf.preInstantiateSingletons();
+	}
+
+	@Test
+	public void testConstructorDependencyWithUnresolvableClass() {
+		DefaultListableBeanFactory lbf = new DefaultListableBeanFactory();
+		RootBeanDefinition bd = new RootBeanDefinition(ConstructorDependencyWithClassResolution.class);
+		bd.getConstructorArgumentValues().addGenericArgumentValue("java.lang.Strin");
+		lbf.registerBeanDefinition("test", bd);
+		try {
+			lbf.preInstantiateSingletons();
+			fail("Should have thrown UnsatisfiedDependencyException");
+		}
+		catch (UnsatisfiedDependencyException expected) {
+			assertTrue(expected.toString().contains("java.lang.Strin"));
+		}
+	}
+
 	@Test
 	public void testBeanDefinitionWithInterface() {
 		DefaultListableBeanFactory lbf = new DefaultListableBeanFactory();
@@ -2033,7 +2057,7 @@ public void testBeanDefinitionWithInterface() {
 		}
 		catch (BeanCreationException ex) {
 			assertEquals("test", ex.getBeanName());
-			assertTrue(ex.getMessage().toLowerCase().indexOf("interface") != -1);
+			assertTrue(ex.getMessage().toLowerCase().contains("interface"));
 		}
 	}
 
@@ -2047,7 +2071,7 @@ public void testBeanDefinitionWithAbstractClass() {
 		}
 		catch (BeanCreationException ex) {
 			assertEquals("test", ex.getBeanName());
-			assertTrue(ex.getMessage().toLowerCase().indexOf("abstract") != -1);
+			assertTrue(ex.getMessage().toLowerCase().contains("abstract"));
 		}
 	}
 
@@ -2739,6 +2763,16 @@ public boolean isSingleton() {
 	}
 
 
+	public static class ConstructorDependencyWithClassResolution {
+
+		public ConstructorDependencyWithClassResolution(Class<?> clazz) {
+		}
+
+		public ConstructorDependencyWithClassResolution() {
+		}
+	}
+
+
 	public static class BeanWithDisposableBean implements DisposableBean {
 
 		private static boolean closed;