BeanInstantiationException preserves Constructor/Method if available

Issue: SPR-14166

Author: jhoeller

spring-beans/src/main/java/org/springframework/beans/BeanInstantiationException.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2014 the original author or authors.
+ * Copyright 2002-2016 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,6 +16,9 @@
 
 package org.springframework.beans;
 
+import java.lang.reflect.Constructor;
+import java.lang.reflect.Method;
+
 /**
  * Exception thrown when instantiation of a bean failed.
  * Carries the offending bean class.
@@ -28,6 +31,10 @@ public class BeanInstantiationException extends FatalBeanException {
 
 	private Class<?> beanClass;
 
+	private Constructor<?> constructor;
+
+	private Method constructingMethod;
+
 
 	/**
 	 * Create a new BeanInstantiationException.
@@ -49,12 +56,60 @@ public BeanInstantiationException(Class<?> beanClass, String msg, Throwable caus
 		this.beanClass = beanClass;
 	}
 
+	/**
+	 * Create a new BeanInstantiationException.
+	 * @param constructor the offending constructor
+	 * @param msg the detail message
+	 * @param cause the root cause
+	 * @since 4.3
+	 */
+	public BeanInstantiationException(Constructor<?> constructor, String msg, Throwable cause) {
+		super("Failed to instantiate [" + constructor.getDeclaringClass().getName() + "]: " + msg, cause);
+		this.beanClass = constructor.getDeclaringClass();
+		this.constructor = constructor;
+	}
 
 	/**
-	 * Return the offending bean class.
+	 * Create a new BeanInstantiationException.
+	 * @param constructingMethod the delegate for bean construction purposes
+	 * (typically, but not necessarily, a static factory method)
+	 * @param msg the detail message
+	 * @param cause the root cause
+	 * @since 4.3
+	 */
+	public BeanInstantiationException(Method constructingMethod, String msg, Throwable cause) {
+		super("Failed to instantiate [" + constructingMethod.getReturnType().getName() + "]: " + msg, cause);
+		this.beanClass = constructingMethod.getReturnType();
+		this.constructingMethod = constructingMethod;
+	}
+
+
+	/**
+	 * Return the offending bean class (never {@code null}).
+	 * @return the class that was to be instantiated
 	 */
 	public Class<?> getBeanClass() {
 		return this.beanClass;
 	}
 
+	/**
+	 * Return the offending constructor, if known.
+	 * @return the constructor in use, or {@code null} in case of a
+	 * factory method or in case of default instantiation
+	 * @since 4.3
+	 */
+	public Constructor<?> getConstructor() {
+		return this.constructor;
+	}
+
+	/**
+	 * Return the delegate for bean construction purposes, if known.
+	 * @return the method in use (typically a static factory method),
+	 * or {@code null} in case of constructor-based instantiation
+	 * @since 4.3
+	 */
+	public Method getConstructingMethod() {
+		return this.constructingMethod;
+	}
+
 }

spring-beans/src/main/java/org/springframework/beans/BeanUtils.java

@@ -147,20 +147,16 @@ public static <T> T instantiateClass(Constructor<T> ctor, Object... args) throws
 			return ctor.newInstance(args);
 		}
 		catch (InstantiationException ex) {
-			throw new BeanInstantiationException(ctor.getDeclaringClass(),
-					"Is it an abstract class?", ex);
+			throw new BeanInstantiationException(ctor, "Is it an abstract class?", ex);
 		}
 		catch (IllegalAccessException ex) {
-			throw new BeanInstantiationException(ctor.getDeclaringClass(),
-					"Is the constructor accessible?", ex);
+			throw new BeanInstantiationException(ctor, "Is the constructor accessible?", ex);
 		}
 		catch (IllegalArgumentException ex) {
-			throw new BeanInstantiationException(ctor.getDeclaringClass(),
-					"Illegal arguments for constructor", ex);
+			throw new BeanInstantiationException(ctor, "Illegal arguments for constructor", ex);
 		}
 		catch (InvocationTargetException ex) {
-			throw new BeanInstantiationException(ctor.getDeclaringClass(),
-					"Constructor threw exception", ex.getTargetException());
+			throw new BeanInstantiationException(ctor, "Constructor threw exception", ex.getTargetException());
 		}
 	}
 

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2014 the original author or authors.
+ * Copyright 2002-2016 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -171,12 +171,12 @@ public Object run() {
 			}
 		}
 		catch (IllegalArgumentException ex) {
-			throw new BeanInstantiationException(factoryMethod.getReturnType(),
+			throw new BeanInstantiationException(factoryMethod,
 					"Illegal arguments to factory method '" + factoryMethod.getName() + "'; " +
 					"args: " + StringUtils.arrayToCommaDelimitedString(args), ex);
 		}
 		catch (IllegalAccessException ex) {
-			throw new BeanInstantiationException(factoryMethod.getReturnType(),
+			throw new BeanInstantiationException(factoryMethod,
 					"Cannot access factory method '" + factoryMethod.getName() + "'; is it public?", ex);
 		}
 		catch (InvocationTargetException ex) {
@@ -186,7 +186,7 @@ public Object run() {
 				msg = "Circular reference involving containing bean '" + bd.getFactoryBeanName() + "' - consider " +
 						"declaring the factory method as static for independence from its containing instance. " + msg;
 			}
-			throw new BeanInstantiationException(factoryMethod.getReturnType(), msg, ex.getTargetException());
+			throw new BeanInstantiationException(factoryMethod, msg, ex.getTargetException());
 		}
 	}