public void preInstantiateSingletons() throws BeansException {
if (logger.isDebugEnabled()) {
logger.debug("Pre-instantiating singletons in factory [" + this + "]");
}
// The superclass's variable by this name is declared private.
String[] beanDefinitionNames = getBeanDefinitionNames();
String beanName = null; // Remember in case of an exception
try {
// for (Iterator it = this.beanDefinitionNames.iterator();
// it.hasNext();) {
for (int i = 0; i < beanDefinitionNames.length; i++) {
beanName = beanDefinitionNames[i];
if (!containsSingleton(beanName) && containsBeanDefinition(beanName)) {
RootBeanDefinition bd = (RootBeanDefinition) getMergedBeanDefinition(beanName);
if (!bd.isAbstract() && bd.isSingleton() && !bd.isLazyInit()) {
if (bd.hasBeanClass() && FactoryBean.class.isAssignableFrom(bd.getBeanClass())) {
FactoryBean factory = (FactoryBean) getBean(FACTORY_BEAN_PREFIX + beanName);
if (factory.isSingleton()) {
getBean(beanName);
}
} else {
getBean(beanName);
}
}
}
}
} catch (BeansException ex) {
// Destroy already created singletons to avoid dangling resources.
logger.error(
"Failed to preinstantiate the singleton named "
+ beanName
+ ". Destroying all Spring beans.",
ex);
try {
destroySingletons();
} catch (Exception ex2) {
logger.error(
"Pre-instantiating singletons failed, and couldn't destroy already created singletons: "
+ ex2,
ex2);
}
throw ex;
}
}
