前言
本次接着上次的bean初始化、依赖注入接着介绍
正文
上一次跟踪到这个方法
org.springframework.beans.factory.support.DefaultListableBeanFactory#createOptionalDependency为指定的依赖项创建一个包装器
private Optional<?> createOptionalDependency(
DependencyDescriptor descriptor, @Nullable String beanName, final Object... args) {
DependencyDescriptor descriptorToUse = new NestedDependencyDescriptor(descriptor) {
@Override
public boolean isRequired() {
return false;
}
@Override
public Object resolveCandidate(String beanName, Class<?> requiredType, BeanFactory beanFactory) {
return (!ObjectUtils.isEmpty(args) ? beanFactory.getBean(beanName, args) :
super.resolveCandidate(beanName, requiredType, beanFactory));
}
};
// 解析依赖
return Optional.ofNullable(doResolveDependency(descriptorToUse, beanName, null, null));
}
找到这行代码
// 解析依赖 return Optional.ofNullable(doResolveDependency(descriptorToUse, beanName, null, null));
进入这个方法
org.springframework.beans.factory.support.DefaultListableBeanFactory#doResolveDependency
@Nullable
public Object doResolveDependency(DependencyDescriptor descriptor, @Nullable String beanName,
@Nullable Set<String> autowiredBeanNames, @Nullable TypeConverter typeConverter) throws BeansException {
// 获取注入点
InjectionPoint previousInjectionPoint = ConstructorResolver.setCurrentInjectionPoint(descriptor);
try {
Object shortcut = descriptor.resolveShortcut(this);
if (shortcut != null) {
return shortcut;
}
Class<?> type = descriptor.getDependencyType();
// 默认值没有依赖
Object value = getAutowireCandidateResolver().getSuggestedValue(descriptor);
if (value != null) {
if (value instanceof String) {
String strVal = resolveEmbeddedValue((String) value);
BeanDefinition bd = (beanName != null && containsBean(beanName) ? getMergedBeanDefinition(beanName) : null);
// 表达式解析
value = evaluateBeanDefinitionString(strVal, bd);
}
TypeConverter converter = (typeConverter != null ? typeConverter : getTypeConverter());
return (descriptor.getField() != null ?
// 调用转换器进行转换
converter.convertIfNecessary(value, type, descriptor.getField()) :
converter.convertIfNecessary(value, type, descriptor.getMethodParameter()));
}
Object multipleBeans = resolveMultipleBeans(descriptor, beanName, autowiredBeanNames, typeConverter);
if (multipleBeans != null) {
return multipleBeans;
}
Map<String, Object> matchingBeans = findAutowireCandidates(beanName, type, descriptor);
if (matchingBeans.isEmpty()) {
if (isRequired(descriptor)) {
raiseNoMatchingBeanFound(type, descriptor.getResolvableType(), descriptor);
}
return null;
}
String autowiredBeanName;
Object instanceCandidate;
if (matchingBeans.size() > 1) {
autowiredBeanName = determineAutowireCandidate(matchingBeans, descriptor);
if (autowiredBeanName == null) {
// 找到不autowiredBeanName，报错没有唯一的bean
if (isRequired(descriptor) || !indicatesMultipleBeans(type)) {
return descriptor.resolveNotUnique(type, matchingBeans);
}
else {
// In case of an optional Collection/Map, silently ignore a non-unique case:
// possibly it was meant to be an empty collection of multiple regular beans
// (before 4.3 in particular when we didn't even look for collection beans).
return null;
}
}
instanceCandidate = matchingBeans.get(autowiredBeanName);
}
else {
// We have exactly one match.
Map.Entry<String, Object> entry = matchingBeans.entrySet().iterator().next();
autowiredBeanName = entry.getKey();
instanceCandidate = entry.getValue();
}
if (autowiredBeanNames != null) {
autowiredBeanNames.add(autowiredBeanName);
}
if (instanceCandidate instanceof Class) {
instanceCandidate = descriptor.resolveCandidate(autowiredBeanName, type, this);
}
Object result = instanceCandidate;
if (result instanceof NullBean) {
if (isRequired(descriptor)) {
raiseNoMatchingBeanFound(type, descriptor.getResolvableType(), descriptor);
}
result = null;
}
if (!ClassUtils.isAssignableValue(type, result)) {
throw new BeanNotOfRequiredTypeException(autowiredBeanName, type, instanceCandidate.getClass());
}
return result;
}
finally {
ConstructorResolver.setCurrentInjectionPoint(previousInjectionPoint);
}
}
找到这个方法
// 解析多元化的bean注入 collection，map，array Object multipleBeans = resolveMultipleBeans(descriptor, beanName, autowiredBeanNames, typeConverter);
@Nullable
private Object resolveMultipleBeans(DependencyDescriptor descriptor, @Nullable String beanName,
@Nullable Set<String> autowiredBeanNames, @Nullable TypeConverter typeConverter) {
Class<?> type = descriptor.getDependencyType();
if (type.isArray()) {
Class<?> componentType = type.getComponentType();
ResolvableType resolvableType = descriptor.getResolvableType();
Class<?> resolvedArrayType = resolvableType.resolve();
if (resolvedArrayType != null && resolvedArrayType != type) {
type = resolvedArrayType;
componentType = resolvableType.getComponentType().resolve();
}
if (componentType == null) {
return null;
}
// 查找自动注入的bean实例
Map<String, Object> matchingBeans = findAutowireCandidates(beanName, componentType,
new MultiElementDescriptor(descriptor));
if (matchingBeans.isEmpty()) {
return null;
}
if (autowiredBeanNames != null) {
autowiredBeanNames.addAll(matchingBeans.keySet());
}
TypeConverter converter = (typeConverter != null ? typeConverter : getTypeConverter());
Object result = converter.convertIfNecessary(matchingBeans.values(), type);
if (getDependencyComparator() != null && result instanceof Object[]) {
Arrays.sort((Object[]) result, adaptDependencyComparator(matchingBeans));
}
return result;
}
else if (Collection.class.isAssignableFrom(type) && type.isInterface()) {
Class<?> elementType = descriptor.getResolvableType().asCollection().resolveGeneric();
if (elementType == null) {
return null;
}
Map<String, Object> matchingBeans = findAutowireCandidates(beanName, elementType,
new MultiElementDescriptor(descriptor));
if (matchingBeans.isEmpty()) {
return null;
}
if (autowiredBeanNames != null) {
autowiredBeanNames.addAll(matchingBeans.keySet());
}
TypeConverter converter = (typeConverter != null ? typeConverter : getTypeConverter());
Object result = converter.convertIfNecessary(matchingBeans.values(), type);
if (getDependencyComparator() != null && result instanceof List) {
((List<?>) result).sort(adaptDependencyComparator(matchingBeans));
}
return result;
}
else if (Map.class == type) {
ResolvableType mapType = descriptor.getResolvableType().asMap();
Class<?> keyType = mapType.resolveGeneric(0);
if (String.class != keyType) {
return null;
}
Class<?> valueType = mapType.resolveGeneric(1);
if (valueType == null) {
return null;
}
Map<String, Object> matchingBeans = findAutowireCandidates(beanName, valueType,
new MultiElementDescriptor(descriptor));
if (matchingBeans.isEmpty()) {
return null;
}
if (autowiredBeanNames != null) {
autowiredBeanNames.addAll(matchingBeans.keySet());
}
return matchingBeans;
}
else {
return null;
}
}
找到这一行代码
// 查找自动注入的bean实例 Map<String, Object> matchingBeans = findAutowireCandidates(beanName, componentType,
进入这个方法
org.springframework.beans.factory.support.DefaultListableBeanFactory#findAutowireCandidates
protected Map<String, Object> findAutowireCandidates(
@Nullable String beanName, Class<?> requiredType, DependencyDescriptor descriptor) {
String[] candidateNames = BeanFactoryUtils.beanNamesForTypeIncludingAncestors(
this, requiredType, true, descriptor.isEager());
Map<String, Object> result = new LinkedHashMap<>(candidateNames.length);
for (Class<?> autowiringType : this.resolvableDependencies.keySet()) {
if (autowiringType.isAssignableFrom(requiredType)) {
Object autowiringValue = this.resolvableDependencies.get(autowiringType);
// 动态代理获取对象
autowiringValue = AutowireUtils.resolveAutowiringValue(autowiringValue, requiredType);
if (requiredType.isInstance(autowiringValue)) {
result.put(ObjectUtils.identityToString(autowiringValue), autowiringValue);
break;
}
}
}
for (String candidate : candidateNames) {
if (!isSelfReference(beanName, candidate) && isAutowireCandidate(candidate, descriptor)) {
addCandidateEntry(result, candidate, descriptor, requiredType);
}
}
if (result.isEmpty() && !indicatesMultipleBeans(requiredType)) {
// Consider fallback matches if the first pass failed to find anything...如果第一次传球没有找到任何东西，可以考虑退场。
DependencyDescriptor fallbackDescriptor = descriptor.forFallbackMatch();
for (String candidate : candidateNames) {
if (!isSelfReference(beanName, candidate) && isAutowireCandidate(candidate, fallbackDescriptor)) {
addCandidateEntry(result, candidate, descriptor, requiredType);
}
}
if (result.isEmpty()) {
// Consider self references as a final pass...把自我推荐当作最终的通行证……
// but in the case of a dependency collection, not the very same bean itself.但是在依赖项集合的情况下，不是非常相同的bean本身。
for (String candidate : candidateNames) {
if (isSelfReference(beanName, candidate) &&
(!(descriptor instanceof MultiElementDescriptor) || !beanName.equals(candidate)) &&
isAutowireCandidate(candidate, fallbackDescriptor)) {
addCandidateEntry(result, candidate, descriptor, requiredType);
}
}
}
}
return result;
}
进入这个方法
org.springframework.beans.factory.support.DefaultListableBeanFactory#getBeanNamesForType(java.lang.Class<?>, boolean, boolean)
@Override
public String[] getBeanNamesForType(@Nullable Class<?> type, boolean includeNonSingletons, boolean allowEagerInit) {
if (!isConfigurationFrozen() || type == null || !allowEagerInit) {
return doGetBeanNamesForType(ResolvableType.forRawClass(type), includeNonSingletons, allowEagerInit);
}
Map<Class<?>, String[]> cache =
(includeNonSingletons ? this.allBeanNamesByType : this.singletonBeanNamesByType);
String[] resolvedBeanNames = cache.get(type);
if (resolvedBeanNames != null) {
return resolvedBeanNames;
}
resolvedBeanNames = doGetBeanNamesForType(ResolvableType.forRawClass(type), includeNonSingletons, true);
if (ClassUtils.isCacheSafe(type, getBeanClassLoader())) {
cache.put(type, resolvedBeanNames);
}
return resolvedBeanNames;
}
进入这个方法
org.springframework.beans.factory.support.DefaultListableBeanFactory#doGetBeanNamesForType根据类型获取beanNames
private String[] doGetBeanNamesForType(ResolvableType type, boolean includeNonSingletons, boolean allowEagerInit) {
List<String> result = new ArrayList<>();
// Check all bean definitions.检查所有的bean定义
for (String beanName : this.beanDefinitionNames) {
// Only consider bean as eligible if the bean name
// is not defined as alias for some other bean.
// 如果beanName不是别名
if (!isAlias(beanName)) {
try {
RootBeanDefinition mbd = getMergedLocalBeanDefinition(beanName);
// Only check bean definition if it is complete.
if (!mbd.isAbstract() && (allowEagerInit ||
(mbd.hasBeanClass() || !mbd.isLazyInit() || isAllowEagerClassLoading()) &&
!requiresEagerInitForType(mbd.getFactoryBeanName()))) {
// In case of FactoryBean, match object created by FactoryBean.在FactoryBean的情况下，匹配由FactoryBean创建的对象。
boolean isFactoryBean = isFactoryBean(beanName, mbd);
BeanDefinitionHolder dbd = mbd.getDecoratedDefinition();
boolean matchFound =
(allowEagerInit || !isFactoryBean ||
(dbd != null && !mbd.isLazyInit()) || containsSingleton(beanName)) &&
(includeNonSingletons ||
(dbd != null ? mbd.isSingleton() : isSingleton(beanName))) &&
isTypeMatch(beanName, type);
if (!matchFound && isFactoryBean) {
// In case of FactoryBean, try to match FactoryBean instance itself next. 在FactoryBean的情况下，试着将FactoryBean实例本身与下一个进行匹配。
// beanName=&beanName
beanName = FACTORY_BEAN_PREFIX + beanName;
matchFound = (includeNonSingletons || mbd.isSingleton()) && isTypeMatch(beanName, type);
}
if (matchFound) {
result.add(beanName);
}
}
}
catch (CannotLoadBeanClassException ex) {
if (allowEagerInit) {
throw ex;
}
// Probably contains a placeholder: let's ignore it for type matching purposes.
if (this.logger.isDebugEnabled()) {
this.logger.debug("Ignoring bean class loading failure for bean '" + beanName + "'", ex);
}
onSuppressedException(ex);
}
catch (BeanDefinitionStoreException ex) {
if (allowEagerInit) {
throw ex;
}
// Probably contains a placeholder: let's ignore it for type matching purposes.
if (this.logger.isDebugEnabled()) {
this.logger.debug("Ignoring unresolvable metadata in bean definition '" + beanName + "'", ex);
}
onSuppressedException(ex);
}
}
}
// Check manually registered singletons too.
for (String beanName : this.manualSingletonNames) {
try {
// In case of FactoryBean, match object created by FactoryBean.
if (isFactoryBean(beanName)) {
if ((includeNonSingletons || isSingleton(beanName)) && isTypeMatch(beanName, type)) {
result.add(beanName);
// Match found for this bean: do not match FactoryBean itself anymore.
continue;
}
// In case of FactoryBean, try to match FactoryBean itself next.
beanName = FACTORY_BEAN_PREFIX + beanName;
}
// Match raw bean instance (might be raw FactoryBean).
if (isTypeMatch(beanName, type)) {
result.add(beanName);
}
}
catch (NoSuchBeanDefinitionException ex) {
// Shouldn't happen - probably a result of circular reference resolution...
if (logger.isDebugEnabled()) {
logger.debug("Failed to check manually registered singleton with name '" + beanName + "'", ex);
}
}
}
return StringUtils.toStringArray(result);
}
返回到这个方法org.springframework.beans.factory.support.DefaultListableBeanFactory#findAutowireCandidates这一行代码
// jdk动态代理获取对象 autowiringValue = AutowireUtils.resolveAutowiringValue(autowiringValue, requiredType);
public static Object resolveAutowiringValue(Object autowiringValue, Class<?> requiredType) {
if (autowiringValue instanceof ObjectFactory && !requiredType.isInstance(autowiringValue)) {
ObjectFactory<?> factory = (ObjectFactory<?>) autowiringValue;
if (autowiringValue instanceof Serializable && requiredType.isInterface()) {
autowiringValue = Proxy.newProxyInstance(requiredType.getClassLoader(),
new Class<?>[] {requiredType}, new ObjectFactoryDelegatingInvocationHandler(factory));
}
else {
return factory.getObject();
}
}
return autowiringValue;
}
返回到这个方法
org.springframework.beans.factory.support.DefaultListableBeanFactory#findAutowireCandidates这一行代码
// 遍历候选的beanName
for (String candidate : candidateNames) {
// 候选的引用不是自己又是自动装配的候选引用
if (!isSelfReference(beanName, candidate) && isAutowireCandidate(candidate, descriptor)) {
addCandidateEntry(result, candidate, descriptor, requiredType);
}
}
进入到这个方法
org.springframework.beans.factory.support.DefaultListableBeanFactory#isAutowireCandidate(java.lang.String, org.springframework.beans.factory.config.DependencyDescriptor, org.springframework.beans.factory.support.AutowireCandidateResolver)
判断这个bean是否是自动注入的候选项并进行依赖注入
protected boolean isAutowireCandidate(String beanName, DependencyDescriptor descriptor, AutowireCandidateResolver resolver)
throws NoSuchBeanDefinitionException {
String beanDefinitionName = BeanFactoryUtils.transformedBeanName(beanName);
if (containsBeanDefinition(beanDefinitionName)) {
// 判断该bean是否是自动注入的候选项
return isAutowireCandidate(beanName, getMergedLocalBeanDefinition(beanDefinitionName), descriptor, resolver);
}
else if (containsSingleton(beanName)) {
return isAutowireCandidate(beanName, new RootBeanDefinition(getType(beanName)), descriptor, resolver);
}
BeanFactory parent = getParentBeanFactory();
if (parent instanceof DefaultListableBeanFactory) {
// No bean definition found in this factory -> delegate to parent.
return ((DefaultListableBeanFactory) parent).isAutowireCandidate(beanName, descriptor, resolver);
}
else if (parent instanceof ConfigurableListableBeanFactory) {
// If no DefaultListableBeanFactory, can't pass the resolver along.
return ((ConfigurableListableBeanFactory) parent).isAutowireCandidate(beanName, descriptor);
}
else {
return true;
}
}
进入这个方法
org.springframework.beans.factory.support.DefaultListableBeanFactory#isAutowireCandidate(java.lang.String, org.springframework.beans.factory.support.RootBeanDefinition, org.springframework.beans.factory.config.DependencyDescriptor, org.springframework.beans.factory.support.AutowireCandidateResolver)
protected boolean isAutowireCandidate(String beanName, RootBeanDefinition mbd,
DependencyDescriptor descriptor, AutowireCandidateResolver resolver) {
String beanDefinitionName = BeanFactoryUtils.transformedBeanName(beanName);
// 将bean定义解析为bean类
resolveBeanClass(mbd, beanDefinitionName);
if (mbd.isFactoryMethodUnique) {
boolean resolve;
synchronized (mbd.constructorArgumentLock) {
resolve = (mbd.resolvedConstructorOrFactoryMethod == null);
}
if (resolve) {
new ConstructorResolver(this).resolveFactoryMethodIfPossible(mbd);
}
}
return resolver.isAutowireCandidate(
new BeanDefinitionHolder(mbd, beanName, getAliases(beanDefinitionName)), descriptor);
}
进入这个方法
// 解析工厂方法 new ConstructorResolver(this).resolveFactoryMethodIfPossible(mbd);
public void resolveFactoryMethodIfPossible(RootBeanDefinition mbd) {
Class<?> factoryClass;
boolean isStatic;
if (mbd.getFactoryBeanName() != null) {
factoryClass = this.beanFactory.getType(mbd.getFactoryBeanName());
isStatic = false;
}
else {
factoryClass = mbd.getBeanClass();
isStatic = true;
}
Assert.state(factoryClass != null, "Unresolvable factory class");
factoryClass = ClassUtils.getUserClass(factoryClass);
// 查找给定bean定义的候选方法
Method[] candidates = getCandidateMethods(factoryClass, mbd);
Method uniqueCandidate = null;
for (Method candidate : candidates) {
if (Modifier.isStatic(candidate.getModifiers()) == isStatic && mbd.isFactoryMethod(candidate)) {
if (uniqueCandidate == null) {
uniqueCandidate = candidate;
}
else if (!Arrays.equals(uniqueCandidate.getParameterTypes(), candidate.getParameterTypes())) {
uniqueCandidate = null;
break;
}
}
}
synchronized (mbd.constructorArgumentLock) {
mbd.resolvedConstructorOrFactoryMethod = uniqueCandidate;
}
}
返回到这个方法
org.springframework.beans.factory.support.DefaultListableBeanFactory#doResolveDependency这一行代码
如果按照类型找到的bean是多个
if (matchingBeans.size() > 1) {
// 获取自动注入的beanName
autowiredBeanName = determineAutowireCandidate(matchingBeans, descriptor);
if (autowiredBeanName == null) {
// 找到不autowiredBeanName，报错没有唯一的bean
if (isRequired(descriptor) || !indicatesMultipleBeans(type)) {
return descriptor.resolveNotUnique(type, matchingBeans);
}
进入这个方法org.springframework.beans.factory.support.DefaultListableBeanFactory#determineAutowireCandidate
@Nullable
protected String determineAutowireCandidate(Map<String, Object> candidates, DependencyDescriptor descriptor) {
Class<?> requiredType = descriptor.getDependencyType();
// 确定的@Primary的候选项
String primaryCandidate = determinePrimaryCandidate(candidates, requiredType);
if (primaryCandidate != null) {
return primaryCandidate;
}
// 确定@Priority的候选项，优先级底层是比较器实现
String priorityCandidate = determineHighestPriorityCandidate(candidates, requiredType);
if (priorityCandidate != null) {
return priorityCandidate;
}
// Fallback
for (Map.Entry<String, Object> entry : candidates.entrySet()) {
String candidateName = entry.getKey();
Object beanInstance = entry.getValue();
if ((beanInstance != null && this.resolvableDependencies.containsValue(beanInstance)) ||
matchesBeanName(candidateName, descriptor.getDependencyName())) {
return candidateName;
}
}
return null;
}
返回到这个方法
org.springframework.beans.factory.support.DefaultListableBeanFactory#resolveDependency这一行代码
// 返回延迟加载的代理对象
Object result = getAutowireCandidateResolver().getLazyResolutionProxyIfNecessary(
descriptor, requestingBeanName);
返回到这个方法
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory#autowireByType
注册依赖bean registerDependentBean(autowiredBeanName, beanName);
找到这个方法
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory#doCreateBean
// 初始化bean exposedObject = initializeBean(beanName, exposedObject, mbd);
protected Object initializeBean(final String beanName, final Object bean, @Nullable RootBeanDefinition mbd) {
if (System.getSecurityManager() != null) {
AccessController.doPrivileged((PrivilegedAction<Object>) () -> {
// 执行aware的方法
invokeAwareMethods(beanName, bean);
return null;
}, getAccessControlContext());
}
else {
invokeAwareMethods(beanName, bean);
}
Object wrappedBean = bean;
if (mbd == null || !mbd.isSynthetic()) {
// 执行初始化之前的beanProccessors
wrappedBean = applyBeanPostProcessorsBeforeInitialization(wrappedBean, beanName);
}
try {
// 执行初始化方法
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;
}
这一行
// 执行初始化方法 invokeInitMethods(beanName, wrappedBean, mbd);
进入org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory#invokeInitMethods
protected void invokeInitMethods(String beanName, final Object bean, @Nullable RootBeanDefinition mbd)
throws Throwable {
// 是否实现了InitializingBean接口
boolean isInitializingBean = (bean instanceof InitializingBean);
// bean定义是否包含afterPropertiesSet这个方法
if (isInitializingBean && (mbd == null || !mbd.isExternallyManagedInitMethod("afterPropertiesSet"))) {
if (logger.isDebugEnabled()) {
logger.debug("Invoking afterPropertiesSet() on bean with name '" + beanName + "'");
}
if (System.getSecurityManager() != null) {
try {
AccessController.doPrivileged((PrivilegedExceptionAction<Object>) () -> {
// 执行afterPropertiesSet方法
((InitializingBean) bean).afterPropertiesSet();
return null;
}, getAccessControlContext());
}
catch (PrivilegedActionException pae) {
throw pae.getException();
}
}
else {
((InitializingBean) bean).afterPropertiesSet();
}
}
if (mbd != null && bean.getClass() != NullBean.class) {
String initMethodName = mbd.getInitMethodName();
if (StringUtils.hasLength(initMethodName) &&
!(isInitializingBean && "afterPropertiesSet".equals(initMethodName)) &&
!mbd.isExternallyManagedInitMethod(initMethodName)) {
// 执行客户自定义的init方法
invokeCustomInitMethod(beanName, bean, mbd);
}
}
}
这一行
// 执行客户自定义的init方法 invokeCustomInitMethod(beanName, bean, mbd);
进入org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory#invokeCustomInitMethod
protected void invokeCustomInitMethod(String beanName, final Object bean, RootBeanDefinition mbd)
throws Throwable {
// 从bean定义中获取初始化方法
String initMethodName = mbd.getInitMethodName();
Assert.state(initMethodName != null, "No init method set");
final Method initMethod = (mbd.isNonPublicAccessAllowed() ?
BeanUtils.findMethod(bean.getClass(), initMethodName) :
ClassUtils.getMethodIfAvailable(bean.getClass(), initMethodName));
if (initMethod == null) {
if (mbd.isEnforceInitMethod()) {
throw new BeanDefinitionValidationException("Couldn't find an init method named '" +
initMethodName + "' on bean with name '" + beanName + "'");
}
else {
if (logger.isDebugEnabled()) {
logger.debug("No default init method named '" + initMethodName +
"' found on bean with name '" + beanName + "'");
}
// Ignore non-existent default lifecycle methods.
return;
}
}
if (logger.isDebugEnabled()) {
logger.debug("Invoking init method '" + initMethodName + "' on bean with name '" + beanName + "'");
}
if (System.getSecurityManager() != null) {
AccessController.doPrivileged((PrivilegedAction<Object>) () -> {
ReflectionUtils.makeAccessible(initMethod);
return null;
});
try {
AccessController.doPrivileged((PrivilegedExceptionAction<Object>) () ->
// 执行初始化方法
initMethod.invoke(bean), getAccessControlContext());
}
catch (PrivilegedActionException pae) {
InvocationTargetException ex = (InvocationTargetException) pae.getException();
throw ex.getTargetException();
}
}
else {
try {
ReflectionUtils.makeAccessible(initMethod);
initMethod.invoke(bean);
}
catch (InvocationTargetException ex) {
throw ex.getTargetException();
}
}
}
返回
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory#initializeBean(java.lang.String, java.lang.Object, org.springframework.beans.factory.support.RootBeanDefinition)这一行
// 执行bean初始化以后的beanProccessors wrappedBean = applyBeanPostProcessorsAfterInitialization(wrappedBean, beanName);
下次继续。
最后
本次介绍到这里，以上内容仅供参考。
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