List of usage examples for org.springframework.beans.factory.support RootBeanDefinition isLenientConstructorResolution
public boolean isLenientConstructorResolution()
From source file:org.springframework.beans.factory.support.ConstructorResolver.java
/** * "autowire constructor" (with constructor arguments by type) behavior. * Also applied if explicit constructor argument values are specified, * matching all remaining arguments with beans from the bean factory. * <p>This corresponds to constructor injection: In this mode, a Spring * bean factory is able to host components that expect constructor-based * dependency resolution./*from w ww . ja va2 s. c o m*/ * @param beanName the name of the bean * @param mbd the merged bean definition for the bean * @param chosenCtors chosen candidate constructors (or {@code null} if none) * @param explicitArgs argument values passed in programmatically via the getBean method, * or {@code null} if none (-> use constructor argument values from bean definition) * @return a BeanWrapper for the new instance */ public BeanWrapper autowireConstructor(final String beanName, final RootBeanDefinition mbd, @Nullable Constructor<?>[] chosenCtors, @Nullable final Object[] explicitArgs) { BeanWrapperImpl bw = new BeanWrapperImpl(); this.beanFactory.initBeanWrapper(bw); Constructor<?> constructorToUse = null; ArgumentsHolder argsHolderToUse = null; Object[] argsToUse = null; if (explicitArgs != null) { argsToUse = explicitArgs; } else { Object[] argsToResolve = null; synchronized (mbd.constructorArgumentLock) { constructorToUse = (Constructor<?>) mbd.resolvedConstructorOrFactoryMethod; if (constructorToUse != null && mbd.constructorArgumentsResolved) { // Found a cached constructor... argsToUse = mbd.resolvedConstructorArguments; if (argsToUse == null) { argsToResolve = mbd.preparedConstructorArguments; } } } if (argsToResolve != null) { argsToUse = resolvePreparedArguments(beanName, mbd, bw, constructorToUse, argsToResolve, true); } } if (constructorToUse == null) { // Need to resolve the constructor. boolean autowiring = (chosenCtors != null || mbd.getResolvedAutowireMode() == RootBeanDefinition.AUTOWIRE_CONSTRUCTOR); ConstructorArgumentValues resolvedValues = null; int minNrOfArgs; if (explicitArgs != null) { minNrOfArgs = explicitArgs.length; } else { ConstructorArgumentValues cargs = mbd.getConstructorArgumentValues(); resolvedValues = new ConstructorArgumentValues(); minNrOfArgs = resolveConstructorArguments(beanName, mbd, bw, cargs, resolvedValues); } // Take specified constructors, if any. Constructor<?>[] candidates = chosenCtors; if (candidates == null) { Class<?> beanClass = mbd.getBeanClass(); try { candidates = (mbd.isNonPublicAccessAllowed() ? beanClass.getDeclaredConstructors() : beanClass.getConstructors()); } catch (Throwable ex) { throw new BeanCreationException(mbd.getResourceDescription(), beanName, "Resolution of declared constructors on bean Class [" + beanClass.getName() + "] from ClassLoader [" + beanClass.getClassLoader() + "] failed", ex); } } AutowireUtils.sortConstructors(candidates); int minTypeDiffWeight = Integer.MAX_VALUE; Set<Constructor<?>> ambiguousConstructors = null; LinkedList<UnsatisfiedDependencyException> causes = null; for (Constructor<?> candidate : candidates) { Class<?>[] paramTypes = candidate.getParameterTypes(); if (constructorToUse != null && argsToUse.length > paramTypes.length) { // Already found greedy constructor that can be satisfied -> // do not look any further, there are only less greedy constructors left. break; } if (paramTypes.length < minNrOfArgs) { continue; } ArgumentsHolder argsHolder; if (resolvedValues != null) { try { String[] paramNames = ConstructorPropertiesChecker.evaluate(candidate, paramTypes.length); if (paramNames == null) { ParameterNameDiscoverer pnd = this.beanFactory.getParameterNameDiscoverer(); if (pnd != null) { paramNames = pnd.getParameterNames(candidate); } } argsHolder = createArgumentArray(beanName, mbd, resolvedValues, bw, paramTypes, paramNames, getUserDeclaredConstructor(candidate), autowiring, candidates.length == 1); } catch (UnsatisfiedDependencyException ex) { if (logger.isTraceEnabled()) { logger.trace( "Ignoring constructor [" + candidate + "] of bean '" + beanName + "': " + ex); } // Swallow and try next constructor. if (causes == null) { causes = new LinkedList<>(); } causes.add(ex); continue; } } else { // Explicit arguments given -> arguments length must match exactly. if (paramTypes.length != explicitArgs.length) { continue; } argsHolder = new ArgumentsHolder(explicitArgs); } int typeDiffWeight = (mbd.isLenientConstructorResolution() ? argsHolder.getTypeDifferenceWeight(paramTypes) : argsHolder.getAssignabilityWeight(paramTypes)); // Choose this constructor if it represents the closest match. if (typeDiffWeight < minTypeDiffWeight) { constructorToUse = candidate; argsHolderToUse = argsHolder; argsToUse = argsHolder.arguments; minTypeDiffWeight = typeDiffWeight; ambiguousConstructors = null; } else if (constructorToUse != null && typeDiffWeight == minTypeDiffWeight) { if (ambiguousConstructors == null) { ambiguousConstructors = new LinkedHashSet<>(); ambiguousConstructors.add(constructorToUse); } ambiguousConstructors.add(candidate); } } 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)"); } else if (ambiguousConstructors != null && !mbd.isLenientConstructorResolution()) { throw new BeanCreationException(mbd.getResourceDescription(), beanName, "Ambiguous constructor matches found in bean '" + beanName + "' " + "(hint: specify index/type/name arguments for simple parameters to avoid type ambiguities): " + ambiguousConstructors); } if (explicitArgs == null) { argsHolderToUse.storeCache(mbd, constructorToUse); } } try { final InstantiationStrategy strategy = this.beanFactory.getInstantiationStrategy(); Object beanInstance; if (System.getSecurityManager() != null) { final Constructor<?> ctorToUse = constructorToUse; final Object[] argumentsToUse = argsToUse; beanInstance = AccessController .doPrivileged( (PrivilegedAction<Object>) () -> strategy.instantiate(mbd, beanName, this.beanFactory, ctorToUse, argumentsToUse), this.beanFactory.getAccessControlContext()); } else { beanInstance = strategy.instantiate(mbd, beanName, this.beanFactory, constructorToUse, argsToUse); } bw.setBeanInstance(beanInstance); return bw; } catch (Throwable ex) { throw new BeanCreationException(mbd.getResourceDescription(), beanName, "Bean instantiation via constructor failed", ex); } }
From source file:org.springframework.beans.factory.support.ConstructorResolver.java
/** * Instantiate the bean using a named factory method. The method may be static, if the * bean definition parameter specifies a class, rather than a "factory-bean", or * an instance variable on a factory object itself configured using Dependency Injection. * <p>Implementation requires iterating over the static or instance methods with the * name specified in the RootBeanDefinition (the method may be overloaded) and trying * to match with the parameters. We don't have the types attached to constructor args, * so trial and error is the only way to go here. The explicitArgs array may contain * argument values passed in programmatically via the corresponding getBean method. * @param beanName the name of the bean/*from w w w .j a va 2 s. c om*/ * @param mbd the merged bean definition for the bean * @param explicitArgs argument values passed in programmatically via the getBean * method, or {@code null} if none (-> use constructor argument values from bean definition) * @return a BeanWrapper for the new instance */ public BeanWrapper instantiateUsingFactoryMethod(final String beanName, final RootBeanDefinition mbd, @Nullable final Object[] explicitArgs) { BeanWrapperImpl bw = new BeanWrapperImpl(); this.beanFactory.initBeanWrapper(bw); Object factoryBean; Class<?> factoryClass; boolean isStatic; String factoryBeanName = mbd.getFactoryBeanName(); if (factoryBeanName != null) { if (factoryBeanName.equals(beanName)) { throw new BeanDefinitionStoreException(mbd.getResourceDescription(), beanName, "factory-bean reference points back to the same bean definition"); } factoryBean = this.beanFactory.getBean(factoryBeanName); if (mbd.isSingleton() && this.beanFactory.containsSingleton(beanName)) { throw new ImplicitlyAppearedSingletonException(); } factoryClass = factoryBean.getClass(); isStatic = false; } else { // It's a static factory method on the bean class. if (!mbd.hasBeanClass()) { throw new BeanDefinitionStoreException(mbd.getResourceDescription(), beanName, "bean definition declares neither a bean class nor a factory-bean reference"); } factoryBean = null; factoryClass = mbd.getBeanClass(); isStatic = true; } Method factoryMethodToUse = null; ArgumentsHolder argsHolderToUse = null; Object[] argsToUse = null; if (explicitArgs != null) { argsToUse = explicitArgs; } else { Object[] argsToResolve = null; synchronized (mbd.constructorArgumentLock) { factoryMethodToUse = (Method) mbd.resolvedConstructorOrFactoryMethod; if (factoryMethodToUse != null && mbd.constructorArgumentsResolved) { // Found a cached factory method... argsToUse = mbd.resolvedConstructorArguments; if (argsToUse == null) { argsToResolve = mbd.preparedConstructorArguments; } } } if (argsToResolve != null) { argsToUse = resolvePreparedArguments(beanName, mbd, bw, factoryMethodToUse, argsToResolve, true); } } if (factoryMethodToUse == null || argsToUse == null) { // Need to determine the factory method... // Try all methods with this name to see if they match the given arguments. factoryClass = ClassUtils.getUserClass(factoryClass); Method[] rawCandidates = getCandidateMethods(factoryClass, mbd); List<Method> candidateSet = new ArrayList<>(); for (Method candidate : rawCandidates) { if (Modifier.isStatic(candidate.getModifiers()) == isStatic && mbd.isFactoryMethod(candidate)) { candidateSet.add(candidate); } } Method[] candidates = candidateSet.toArray(new Method[0]); AutowireUtils.sortFactoryMethods(candidates); ConstructorArgumentValues resolvedValues = null; boolean autowiring = (mbd.getResolvedAutowireMode() == RootBeanDefinition.AUTOWIRE_CONSTRUCTOR); int minTypeDiffWeight = Integer.MAX_VALUE; Set<Method> ambiguousFactoryMethods = null; int minNrOfArgs; if (explicitArgs != null) { minNrOfArgs = explicitArgs.length; } else { // We don't have arguments passed in programmatically, so we need to resolve the // arguments specified in the constructor arguments held in the bean definition. if (mbd.hasConstructorArgumentValues()) { ConstructorArgumentValues cargs = mbd.getConstructorArgumentValues(); resolvedValues = new ConstructorArgumentValues(); minNrOfArgs = resolveConstructorArguments(beanName, mbd, bw, cargs, resolvedValues); } else { minNrOfArgs = 0; } } LinkedList<UnsatisfiedDependencyException> causes = null; for (Method candidate : candidates) { Class<?>[] paramTypes = candidate.getParameterTypes(); if (paramTypes.length >= minNrOfArgs) { ArgumentsHolder argsHolder; if (explicitArgs != null) { // Explicit arguments given -> arguments length must match exactly. if (paramTypes.length != explicitArgs.length) { continue; } argsHolder = new ArgumentsHolder(explicitArgs); } else { // Resolved constructor arguments: type conversion and/or autowiring necessary. try { String[] paramNames = null; ParameterNameDiscoverer pnd = this.beanFactory.getParameterNameDiscoverer(); if (pnd != null) { paramNames = pnd.getParameterNames(candidate); } argsHolder = createArgumentArray(beanName, mbd, resolvedValues, bw, paramTypes, paramNames, candidate, autowiring, candidates.length == 1); } catch (UnsatisfiedDependencyException ex) { if (logger.isTraceEnabled()) { logger.trace("Ignoring factory method [" + candidate + "] of bean '" + beanName + "': " + ex); } // Swallow and try next overloaded factory method. if (causes == null) { causes = new LinkedList<>(); } causes.add(ex); continue; } } int typeDiffWeight = (mbd.isLenientConstructorResolution() ? argsHolder.getTypeDifferenceWeight(paramTypes) : argsHolder.getAssignabilityWeight(paramTypes)); // Choose this factory method if it represents the closest match. if (typeDiffWeight < minTypeDiffWeight) { factoryMethodToUse = candidate; argsHolderToUse = argsHolder; argsToUse = argsHolder.arguments; minTypeDiffWeight = typeDiffWeight; ambiguousFactoryMethods = null; } // Find out about ambiguity: In case of the same type difference weight // for methods with the same number of parameters, collect such candidates // and eventually raise an ambiguity exception. // However, only perform that check in non-lenient constructor resolution mode, // and explicitly ignore overridden methods (with the same parameter signature). else if (factoryMethodToUse != null && typeDiffWeight == minTypeDiffWeight && !mbd.isLenientConstructorResolution() && paramTypes.length == factoryMethodToUse.getParameterCount() && !Arrays.equals(paramTypes, factoryMethodToUse.getParameterTypes())) { if (ambiguousFactoryMethods == null) { ambiguousFactoryMethods = new LinkedHashSet<>(); ambiguousFactoryMethods.add(factoryMethodToUse); } ambiguousFactoryMethods.add(candidate); } } } if (factoryMethodToUse == null) { if (causes != null) { UnsatisfiedDependencyException ex = causes.removeLast(); for (Exception cause : causes) { this.beanFactory.onSuppressedException(cause); } throw ex; } List<String> argTypes = new ArrayList<>(minNrOfArgs); if (explicitArgs != null) { for (Object arg : explicitArgs) { argTypes.add(arg != null ? arg.getClass().getSimpleName() : "null"); } } else if (resolvedValues != null) { Set<ValueHolder> valueHolders = new LinkedHashSet<>(resolvedValues.getArgumentCount()); valueHolders.addAll(resolvedValues.getIndexedArgumentValues().values()); valueHolders.addAll(resolvedValues.getGenericArgumentValues()); for (ValueHolder value : valueHolders) { String argType = (value.getType() != null ? ClassUtils.getShortName(value.getType()) : (value.getValue() != null ? value.getValue().getClass().getSimpleName() : "null")); argTypes.add(argType); } } String argDesc = StringUtils.collectionToCommaDelimitedString(argTypes); throw new BeanCreationException(mbd.getResourceDescription(), beanName, "No matching factory method found: " + (mbd.getFactoryBeanName() != null ? "factory bean '" + mbd.getFactoryBeanName() + "'; " : "") + "factory method '" + mbd.getFactoryMethodName() + "(" + argDesc + ")'. " + "Check that a method with the specified name " + (minNrOfArgs > 0 ? "and arguments " : "") + "exists and that it is " + (isStatic ? "static" : "non-static") + "."); } else if (void.class == factoryMethodToUse.getReturnType()) { throw new BeanCreationException(mbd.getResourceDescription(), beanName, "Invalid factory method '" + mbd.getFactoryMethodName() + "': needs to have a non-void return type!"); } else if (ambiguousFactoryMethods != null) { throw new BeanCreationException(mbd.getResourceDescription(), beanName, "Ambiguous factory method matches found in bean '" + beanName + "' " + "(hint: specify index/type/name arguments for simple parameters to avoid type ambiguities): " + ambiguousFactoryMethods); } if (explicitArgs == null && argsHolderToUse != null) { argsHolderToUse.storeCache(mbd, factoryMethodToUse); } } try { Object beanInstance; if (System.getSecurityManager() != null) { final Object fb = factoryBean; final Method factoryMethod = factoryMethodToUse; final Object[] args = argsToUse; beanInstance = AccessController.doPrivileged( (PrivilegedAction<Object>) () -> this.beanFactory.getInstantiationStrategy() .instantiate(mbd, beanName, this.beanFactory, fb, factoryMethod, args), this.beanFactory.getAccessControlContext()); } else { beanInstance = this.beanFactory.getInstantiationStrategy().instantiate(mbd, beanName, this.beanFactory, factoryBean, factoryMethodToUse, argsToUse); } bw.setBeanInstance(beanInstance); return bw; } catch (Throwable ex) { throw new BeanCreationException(mbd.getResourceDescription(), beanName, "Bean instantiation via factory method failed", ex); } }