Locally cache factory method candidates per factory class

Issue: SPR-17071

Author: jhoeller

spring-beans/src/main/java/org/springframework/beans/factory/support/AbstractAutowireCapableBeanFactory.java

@@ -31,7 +31,6 @@
 import java.util.HashSet;
 import java.util.LinkedHashSet;
 import java.util.List;
-import java.util.Map;
 import java.util.Set;
 import java.util.TreeSet;
 import java.util.concurrent.ConcurrentHashMap;
@@ -156,11 +155,14 @@ public abstract class AbstractAutowireCapableBeanFactory extends AbstractBeanFac
 	private final NamedThreadLocal<String> currentlyCreatedBean = new NamedThreadLocal<>("Currently created bean");
 
 	/** Cache of unfinished FactoryBean instances: FactoryBean name to BeanWrapper. */
-	private final Map<String, BeanWrapper> factoryBeanInstanceCache = new ConcurrentHashMap<>(16);
+	private final ConcurrentMap<String, BeanWrapper> factoryBeanInstanceCache = new ConcurrentHashMap<>();
+
+	/** Cache of candidate factory methods per factory class. */
+	private final ConcurrentMap<Class<?>, Method[]> factoryMethodCandidateCache = new ConcurrentHashMap<>();
 
 	/** Cache of filtered PropertyDescriptors: bean Class to PropertyDescriptor array. */
 	private final ConcurrentMap<Class<?>, PropertyDescriptor[]> filteredPropertyDescriptorsCache =
-			new ConcurrentHashMap<>(256);
+			new ConcurrentHashMap<>();
 
 
 	/**
@@ -716,7 +718,9 @@ protected Class<?> getTypeForFactoryMethod(String beanName, RootBeanDefinition m
 		Method uniqueCandidate = null;
 		int minNrOfArgs =
 				(mbd.hasConstructorArgumentValues() ? mbd.getConstructorArgumentValues().getArgumentCount() : 0);
-		Method[] candidates = ReflectionUtils.getUniqueDeclaredMethods(factoryClass);
+		Method[] candidates = this.factoryMethodCandidateCache.computeIfAbsent(
+				factoryClass, ReflectionUtils::getUniqueDeclaredMethods);
+
 		for (Method candidate : candidates) {
 			if (Modifier.isStatic(candidate.getModifiers()) == isStatic && mbd.isFactoryMethod(candidate) &&
 					candidate.getParameterCount() >= minNrOfArgs) {