List of usage examples for org.springframework.beans.factory.support RootBeanDefinition getResourceDescription
@Override
@Nullable
public String getResourceDescription()
From source file:org.apache.struts2.spring.ClassReloadingBeanFactory.java
protected Class resolveBeanClass(RootBeanDefinition mbd, String beanName, Class[] typesToMatch) { try {//from w w w.j a v a 2 s .co m //commented to cached class is not used /* if (mbd.hasBeanClass()) { return mbd.getBeanClass(); }*/ if (typesToMatch != null) { ClassLoader tempClassLoader = getTempClassLoader(); if (tempClassLoader != null) { if (tempClassLoader instanceof DecoratingClassLoader) { DecoratingClassLoader dcl = (DecoratingClassLoader) tempClassLoader; for (int i = 0; i < typesToMatch.length; i++) { dcl.excludeClass(typesToMatch[i].getName()); } } String className = mbd.getBeanClassName(); return (className != null ? ClassUtils.forName(className, tempClassLoader) : null); } } return mbd.resolveBeanClass(getBeanClassLoader()); } catch (ClassNotFoundException ex) { throw new CannotLoadBeanClassException(mbd.getResourceDescription(), beanName, mbd.getBeanClassName(), ex); } catch (LinkageError err) { throw new CannotLoadBeanClassException(mbd.getResourceDescription(), beanName, mbd.getBeanClassName(), err); } }
From source file:org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.java
/** * Central method of this class: creates a bean instance, * populates the bean instance, applies post-processors, etc. * @see #doCreateBean/*w w w. ja va 2s . c o m*/ */ @Override protected Object createBean(String beanName, RootBeanDefinition mbd, @Nullable Object[] args) throws BeanCreationException { if (logger.isTraceEnabled()) { logger.trace("Creating instance of bean '" + beanName + "'"); } RootBeanDefinition mbdToUse = mbd; // Make sure bean class is actually resolved at this point, and // clone the bean definition in case of a dynamically resolved Class // which cannot be stored in the shared merged bean definition. Class<?> resolvedClass = resolveBeanClass(mbd, beanName); if (resolvedClass != null && !mbd.hasBeanClass() && mbd.getBeanClassName() != null) { mbdToUse = new RootBeanDefinition(mbd); mbdToUse.setBeanClass(resolvedClass); } // Prepare method overrides. try { mbdToUse.prepareMethodOverrides(); } catch (BeanDefinitionValidationException ex) { throw new BeanDefinitionStoreException(mbdToUse.getResourceDescription(), beanName, "Validation of method overrides failed", ex); } try { // Give BeanPostProcessors a chance to return a proxy instead of the target bean instance. Object bean = resolveBeforeInstantiation(beanName, mbdToUse); if (bean != null) { return bean; } } catch (Throwable ex) { throw new BeanCreationException(mbdToUse.getResourceDescription(), beanName, "BeanPostProcessor before instantiation of bean failed", ex); } try { Object beanInstance = doCreateBean(beanName, mbdToUse, args); if (logger.isTraceEnabled()) { logger.trace("Finished creating instance of bean '" + beanName + "'"); } return beanInstance; } catch (BeanCreationException | ImplicitlyAppearedSingletonException ex) { // A previously detected exception with proper bean creation context already, // or illegal singleton state to be communicated up to DefaultSingletonBeanRegistry. throw ex; } catch (Throwable ex) { throw new BeanCreationException(mbdToUse.getResourceDescription(), beanName, "Unexpected exception during bean creation", ex); } }
From source file:org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.java
/** * Actually create the specified bean. Pre-creation processing has already happened * at this point, e.g. checking {@code postProcessBeforeInstantiation} callbacks. * <p>Differentiates between default bean instantiation, use of a * factory method, and autowiring a constructor. * @param beanName the name of the bean/*w ww . ja v a 2s . co m*/ * @param mbd the merged bean definition for the bean * @param args explicit arguments to use for constructor or factory method invocation * @return a new instance of the bean * @throws BeanCreationException if the bean could not be created * @see #instantiateBean * @see #instantiateUsingFactoryMethod * @see #autowireConstructor */ protected Object doCreateBean(final String beanName, final RootBeanDefinition mbd, final @Nullable Object[] args) throws BeanCreationException { // Instantiate the bean. BeanWrapper instanceWrapper = null; if (mbd.isSingleton()) { instanceWrapper = this.factoryBeanInstanceCache.remove(beanName); } if (instanceWrapper == null) { instanceWrapper = createBeanInstance(beanName, mbd, args); } final Object bean = instanceWrapper.getWrappedInstance(); Class<?> beanType = instanceWrapper.getWrappedClass(); if (beanType != NullBean.class) { mbd.resolvedTargetType = beanType; } // Allow post-processors to modify the merged bean definition. synchronized (mbd.postProcessingLock) { if (!mbd.postProcessed) { try { applyMergedBeanDefinitionPostProcessors(mbd, beanType, beanName); } catch (Throwable ex) { throw new BeanCreationException(mbd.getResourceDescription(), beanName, "Post-processing of merged bean definition failed", ex); } mbd.postProcessed = true; } } // Eagerly cache singletons to be able to resolve circular references // even when triggered by lifecycle interfaces like BeanFactoryAware. boolean earlySingletonExposure = (mbd.isSingleton() && this.allowCircularReferences && isSingletonCurrentlyInCreation(beanName)); if (earlySingletonExposure) { if (logger.isTraceEnabled()) { logger.trace("Eagerly caching bean '" + beanName + "' to allow for resolving potential circular references"); } addSingletonFactory(beanName, () -> getEarlyBeanReference(beanName, mbd, bean)); } // Initialize the bean instance. Object exposedObject = bean; try { populateBean(beanName, mbd, instanceWrapper); exposedObject = initializeBean(beanName, exposedObject, mbd); } catch (Throwable ex) { if (ex instanceof BeanCreationException && beanName.equals(((BeanCreationException) ex).getBeanName())) { throw (BeanCreationException) ex; } else { throw new BeanCreationException(mbd.getResourceDescription(), beanName, "Initialization of bean failed", ex); } } if (earlySingletonExposure) { Object earlySingletonReference = getSingleton(beanName, false); if (earlySingletonReference != null) { if (exposedObject == bean) { exposedObject = earlySingletonReference; } else if (!this.allowRawInjectionDespiteWrapping && hasDependentBean(beanName)) { String[] dependentBeans = getDependentBeans(beanName); Set<String> actualDependentBeans = new LinkedHashSet<>(dependentBeans.length); for (String dependentBean : dependentBeans) { if (!removeSingletonIfCreatedForTypeCheckOnly(dependentBean)) { actualDependentBeans.add(dependentBean); } } if (!actualDependentBeans.isEmpty()) { throw new BeanCurrentlyInCreationException(beanName, "Bean with name '" + beanName + "' has been injected into other beans [" + StringUtils.collectionToCommaDelimitedString(actualDependentBeans) + "] in its raw version as part of a circular reference, but has eventually been " + "wrapped. This means that said other beans do not use the final version of the " + "bean. This is often the result of over-eager type matching - consider using " + "'getBeanNamesOfType' with the 'allowEagerInit' flag turned off, for example."); } } } } // Register bean as disposable. try { registerDisposableBeanIfNecessary(beanName, bean, mbd); } catch (BeanDefinitionValidationException ex) { throw new BeanCreationException(mbd.getResourceDescription(), beanName, "Invalid destruction signature", ex); } return exposedObject; }
From source file:org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.java
/** * Determine the target type for the given bean definition which is based on * a factory method. Only called if there is no singleton instance registered * for the target bean already.// w ww .j a va 2 s . c om * <p>This implementation determines the type matching {@link #createBean}'s * different creation strategies. As far as possible, we'll perform static * type checking to avoid creation of the target bean. * @param beanName the name of the bean (for error handling purposes) * @param mbd the merged bean definition for the bean * @param typesToMatch the types to match in case of internal type matching purposes * (also signals that the returned {@code Class} will never be exposed to application code) * @return the type for the bean if determinable, or {@code null} otherwise * @see #createBean */ @Nullable protected Class<?> getTypeForFactoryMethod(String beanName, RootBeanDefinition mbd, Class<?>... typesToMatch) { ResolvableType cachedReturnType = mbd.factoryMethodReturnType; if (cachedReturnType != null) { return cachedReturnType.resolve(); } Class<?> factoryClass; boolean isStatic = true; 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"); } // Check declared factory method return type on factory class. factoryClass = getType(factoryBeanName); isStatic = false; } else { // Check declared factory method return type on bean class. factoryClass = resolveBeanClass(mbd, beanName, typesToMatch); } if (factoryClass == null) { return null; } factoryClass = ClassUtils.getUserClass(factoryClass); // If all factory methods have the same return type, return that type. // Can't clearly figure out exact method due to type converting / autowiring! Class<?> commonType = null; Method uniqueCandidate = null; int minNrOfArgs = (mbd.hasConstructorArgumentValues() ? mbd.getConstructorArgumentValues().getArgumentCount() : 0); Method[] candidates = this.factoryMethodCandidateCache.computeIfAbsent(factoryClass, ReflectionUtils::getUniqueDeclaredMethods); for (Method candidate : candidates) { if (Modifier.isStatic(candidate.getModifiers()) == isStatic && mbd.isFactoryMethod(candidate) && candidate.getParameterCount() >= minNrOfArgs) { // Declared type variables to inspect? if (candidate.getTypeParameters().length > 0) { try { // Fully resolve parameter names and argument values. Class<?>[] paramTypes = candidate.getParameterTypes(); String[] paramNames = null; ParameterNameDiscoverer pnd = getParameterNameDiscoverer(); if (pnd != null) { paramNames = pnd.getParameterNames(candidate); } ConstructorArgumentValues cav = mbd.getConstructorArgumentValues(); Set<ConstructorArgumentValues.ValueHolder> usedValueHolders = new HashSet<>( paramTypes.length); Object[] args = new Object[paramTypes.length]; for (int i = 0; i < args.length; i++) { ConstructorArgumentValues.ValueHolder valueHolder = cav.getArgumentValue(i, paramTypes[i], (paramNames != null ? paramNames[i] : null), usedValueHolders); if (valueHolder == null) { valueHolder = cav.getGenericArgumentValue(null, null, usedValueHolders); } if (valueHolder != null) { args[i] = valueHolder.getValue(); usedValueHolders.add(valueHolder); } } Class<?> returnType = AutowireUtils.resolveReturnTypeForFactoryMethod(candidate, args, getBeanClassLoader()); uniqueCandidate = (commonType == null && returnType == candidate.getReturnType() ? candidate : null); commonType = ClassUtils.determineCommonAncestor(returnType, commonType); if (commonType == null) { // Ambiguous return types found: return null to indicate "not determinable". return null; } } catch (Throwable ex) { if (logger.isDebugEnabled()) { logger.debug("Failed to resolve generic return type for factory method: " + ex); } } } else { uniqueCandidate = (commonType == null ? candidate : null); commonType = ClassUtils.determineCommonAncestor(candidate.getReturnType(), commonType); if (commonType == null) { // Ambiguous return types found: return null to indicate "not determinable". return null; } } } } if (commonType == null) { return null; } // Common return type found: all factory methods return same type. For a non-parameterized // unique candidate, cache the full type declaration context of the target factory method. cachedReturnType = (uniqueCandidate != null ? ResolvableType.forMethodReturnType(uniqueCandidate) : ResolvableType.forClass(commonType)); mbd.factoryMethodReturnType = cachedReturnType; return cachedReturnType.resolve(); }
From source file:org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.java
/** * Create a new instance for the specified bean, using an appropriate instantiation strategy: * factory method, constructor autowiring, or simple instantiation. * @param beanName the name of the bean//from www.java2s . c o m * @param mbd the bean definition for the bean * @param args explicit arguments to use for constructor or factory method invocation * @return a BeanWrapper for the new instance * @see #obtainFromSupplier * @see #instantiateUsingFactoryMethod * @see #autowireConstructor * @see #instantiateBean */ protected BeanWrapper createBeanInstance(String beanName, RootBeanDefinition mbd, @Nullable Object[] args) { // Make sure bean class is actually resolved at this point. Class<?> beanClass = resolveBeanClass(mbd, beanName); if (beanClass != null && !Modifier.isPublic(beanClass.getModifiers()) && !mbd.isNonPublicAccessAllowed()) { throw new BeanCreationException(mbd.getResourceDescription(), beanName, "Bean class isn't public, and non-public access not allowed: " + beanClass.getName()); } Supplier<?> instanceSupplier = mbd.getInstanceSupplier(); if (instanceSupplier != null) { return obtainFromSupplier(instanceSupplier, beanName); } if (mbd.getFactoryMethodName() != null) { return instantiateUsingFactoryMethod(beanName, mbd, args); } // Shortcut when re-creating the same bean... boolean resolved = false; boolean autowireNecessary = false; if (args == null) { synchronized (mbd.constructorArgumentLock) { if (mbd.resolvedConstructorOrFactoryMethod != null) { resolved = true; autowireNecessary = mbd.constructorArgumentsResolved; } } } if (resolved) { if (autowireNecessary) { return autowireConstructor(beanName, mbd, null, null); } else { return instantiateBean(beanName, mbd); } } // Need to determine the constructor... Constructor<?>[] ctors = determineConstructorsFromBeanPostProcessors(beanClass, beanName); if (ctors != null || mbd.getResolvedAutowireMode() == RootBeanDefinition.AUTOWIRE_CONSTRUCTOR || mbd.hasConstructorArgumentValues() || !ObjectUtils.isEmpty(args)) { return autowireConstructor(beanName, mbd, ctors, args); } // No special handling: simply use no-arg constructor. return instantiateBean(beanName, mbd); }
From source file:org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.java
/** * Instantiate the given bean using its default constructor. * @param beanName the name of the bean/*from w w w. j av a 2 s . c o m*/ * @param mbd the bean definition for the bean * @return a BeanWrapper for the new instance */ protected BeanWrapper instantiateBean(final String beanName, final RootBeanDefinition mbd) { try { Object beanInstance; final BeanFactory parent = this; if (System.getSecurityManager() != null) { beanInstance = AccessController .doPrivileged((PrivilegedAction<Object>) () -> getInstantiationStrategy().instantiate(mbd, beanName, parent), getAccessControlContext()); } else { beanInstance = getInstantiationStrategy().instantiate(mbd, beanName, parent); } BeanWrapper bw = new BeanWrapperImpl(beanInstance); initBeanWrapper(bw); return bw; } catch (Throwable ex) { throw new BeanCreationException(mbd.getResourceDescription(), beanName, "Instantiation of bean failed", ex); } }
From source file:org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.java
/** * Populate the bean instance in the given BeanWrapper with the property values * from the bean definition.//from w ww. ja va 2 s.c om * @param beanName the name of the bean * @param mbd the bean definition for the bean * @param bw the BeanWrapper with bean instance */ @SuppressWarnings("deprecation") // for postProcessPropertyValues protected void populateBean(String beanName, RootBeanDefinition mbd, @Nullable BeanWrapper bw) { if (bw == null) { if (mbd.hasPropertyValues()) { throw new BeanCreationException(mbd.getResourceDescription(), beanName, "Cannot apply property values to null instance"); } else { // Skip property population phase for null instance. return; } } // Give any InstantiationAwareBeanPostProcessors the opportunity to modify the // state of the bean before properties are set. This can be used, for example, // to support styles of field injection. boolean continueWithPropertyPopulation = true; if (!mbd.isSynthetic() && hasInstantiationAwareBeanPostProcessors()) { for (BeanPostProcessor bp : getBeanPostProcessors()) { if (bp instanceof InstantiationAwareBeanPostProcessor) { InstantiationAwareBeanPostProcessor ibp = (InstantiationAwareBeanPostProcessor) bp; if (!ibp.postProcessAfterInstantiation(bw.getWrappedInstance(), beanName)) { continueWithPropertyPopulation = false; break; } } } } if (!continueWithPropertyPopulation) { return; } PropertyValues pvs = (mbd.hasPropertyValues() ? mbd.getPropertyValues() : null); if (mbd.getResolvedAutowireMode() == RootBeanDefinition.AUTOWIRE_BY_NAME || mbd.getResolvedAutowireMode() == RootBeanDefinition.AUTOWIRE_BY_TYPE) { MutablePropertyValues newPvs = new MutablePropertyValues(pvs); // Add property values based on autowire by name if applicable. if (mbd.getResolvedAutowireMode() == RootBeanDefinition.AUTOWIRE_BY_NAME) { autowireByName(beanName, mbd, bw, newPvs); } // Add property values based on autowire by type if applicable. if (mbd.getResolvedAutowireMode() == RootBeanDefinition.AUTOWIRE_BY_TYPE) { autowireByType(beanName, mbd, bw, newPvs); } pvs = newPvs; } boolean hasInstAwareBpps = hasInstantiationAwareBeanPostProcessors(); boolean needsDepCheck = (mbd.getDependencyCheck() != RootBeanDefinition.DEPENDENCY_CHECK_NONE); PropertyDescriptor[] filteredPds = null; if (hasInstAwareBpps) { if (pvs == null) { pvs = mbd.getPropertyValues(); } for (BeanPostProcessor bp : getBeanPostProcessors()) { if (bp instanceof InstantiationAwareBeanPostProcessor) { InstantiationAwareBeanPostProcessor ibp = (InstantiationAwareBeanPostProcessor) bp; PropertyValues pvsToUse = ibp.postProcessProperties(pvs, bw.getWrappedInstance(), beanName); if (pvsToUse == null) { if (filteredPds == null) { filteredPds = filterPropertyDescriptorsForDependencyCheck(bw, mbd.allowCaching); } pvsToUse = ibp.postProcessPropertyValues(pvs, filteredPds, bw.getWrappedInstance(), beanName); if (pvsToUse == null) { return; } } pvs = pvsToUse; } } } if (needsDepCheck) { if (filteredPds == null) { filteredPds = filterPropertyDescriptorsForDependencyCheck(bw, mbd.allowCaching); } checkDependencies(beanName, mbd, filteredPds, pvs); } if (pvs != null) { applyPropertyValues(beanName, mbd, bw, pvs); } }
From source file:org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.java
/** * Initialize the given bean instance, applying factory callbacks * as well as init methods and bean post processors. * <p>Called from {@link #createBean} for traditionally defined beans, * and from {@link #initializeBean} for existing bean instances. * @param beanName the bean name in the factory (for debugging purposes) * @param bean the new bean instance we may need to initialize * @param mbd the bean definition that the bean was created with * (can also be {@code null}, if given an existing bean instance) * @return the initialized bean instance (potentially wrapped) * @see BeanNameAware// w w w .ja va 2 s .c o m * @see BeanClassLoaderAware * @see BeanFactoryAware * @see #applyBeanPostProcessorsBeforeInitialization * @see #invokeInitMethods * @see #applyBeanPostProcessorsAfterInitialization */ protected Object initializeBean(final String beanName, final Object bean, @Nullable RootBeanDefinition mbd) { if (System.getSecurityManager() != null) { AccessController.doPrivileged((PrivilegedAction<Object>) () -> { invokeAwareMethods(beanName, bean); return null; }, getAccessControlContext()); } else { invokeAwareMethods(beanName, bean); } Object wrappedBean = bean; if (mbd == null || !mbd.isSynthetic()) { wrappedBean = applyBeanPostProcessorsBeforeInitialization(wrappedBean, beanName); } try { invokeInitMethods(beanName, wrappedBean, mbd); } catch (Throwable ex) { throw new BeanCreationException((mbd != null ? mbd.getResourceDescription() : null), beanName, "Invocation of init method failed", ex); } if (mbd == null || !mbd.isSynthetic()) { wrappedBean = applyBeanPostProcessorsAfterInitialization(wrappedBean, beanName); } return wrappedBean; }
From source file:org.springframework.beans.factory.support.AbstractBeanFactory.java
/** * Return a RootBeanDefinition for the given top-level bean, by merging with * the parent if the given bean's definition is a child bean definition. * @param beanName the name of the bean definition * @param bd the original bean definition (Root/ChildBeanDefinition) * @return a (potentially merged) RootBeanDefinition for the given bean * @throws BeanDefinitionStoreException in case of an invalid bean definition *///from w w w . ja v a2s . com protected RootBeanDefinition getMergedBeanDefinition(String beanName, BeanDefinition bd) throws BeanDefinitionStoreException { if (bd instanceof RootBeanDefinition) { // Return root bean definition as-is. return (RootBeanDefinition) bd; } else if (bd instanceof ChildBeanDefinition) { // Child bean definition: needs to be merged with parent. ChildBeanDefinition cbd = (ChildBeanDefinition) bd; RootBeanDefinition pbd = null; try { if (!beanName.equals(cbd.getParentName())) { pbd = getMergedBeanDefinition(cbd.getParentName(), true); } else { if (getParentBeanFactory() instanceof AbstractBeanFactory) { AbstractBeanFactory parentFactory = (AbstractBeanFactory) getParentBeanFactory(); pbd = parentFactory.getMergedBeanDefinition(cbd.getParentName(), true); } else { throw new NoSuchBeanDefinitionException(cbd.getParentName(), "Parent name '" + cbd.getParentName() + "' is equal to bean name '" + beanName + "': cannot be resolved without an AbstractBeanFactory parent"); } } } catch (NoSuchBeanDefinitionException ex) { throw new BeanDefinitionStoreException(cbd.getResourceDescription(), beanName, "Could not resolve parent bean definition '" + cbd.getParentName() + "'", ex); } // Deep copy with overridden values. RootBeanDefinition rbd = new RootBeanDefinition(pbd); rbd.overrideFrom(cbd); // Validate merged definition: mainly to prepare method overrides. try { rbd.validate(); } catch (BeanDefinitionValidationException ex) { throw new BeanDefinitionStoreException(rbd.getResourceDescription(), beanName, "Validation of bean definition failed", ex); } return rbd; } else { throw new BeanDefinitionStoreException(bd.getResourceDescription(), beanName, "Definition is neither a RootBeanDefinition nor a ChildBeanDefinition"); } }
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 ww w. j av a2 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); } }