Spring core performance

Spring core performance

1. CachedIntrospectionResults.<init> takes a lot of time. Every BeanWrapper passes from CachedIntrospectionResults.forClass, it inokes
 (if absent in static cache) Introspector.getBeanInfo which takes a lot of time. Cache usage occurs at 
AbstractApplicationContext.finishBeanFactoryInitialization in scope of refresh() method but at the end of refresh method in finally block 
there is call to resetCommonCaches:
 
protected void resetCommonCaches() {
		ReflectionUtils.clearCache();
		ResolvableType.clearCache();
		CachedIntrospectionResults.clearClassLoader(getClassLoader()); // <---- remove it
	}
  
which clears cache and if context is initialized a lot of time (topologies, etc) there is no cache reusage. To fix it:
override resetCommonCaches in child context without resetCommonCaches call:

protected void resetCommonCaches() {
		ReflectionUtils.clearCache();
		ResolvableType.clearCache();
	}