Polishing

spring-core/src/main/java/org/springframework/core/convert/support/StringToLocaleConverter.java

@@ -19,6 +19,7 @@ package org.springframework.core.convert.support;
 import java.util.Locale;
 
 import org.springframework.core.convert.converter.Converter;
+import org.springframework.lang.Nullable;
 import org.springframework.util.StringUtils;
 
 /**
@@ -35,6 +36,7 @@ import org.springframework.util.StringUtils;
 final class StringToLocaleConverter implements Converter<String, Locale> {
 
 	@Override
+	@Nullable
 	public Locale convert(String source) {
 		return StringUtils.parseLocale(source);
 	}

spring-core/src/main/java/org/springframework/util/ConcurrentReferenceHashMap.java

@@ -651,9 +651,9 @@ public class ConcurrentReferenceHashMap<K, V> extends AbstractMap<K, V> implemen
 			return null;
 		}
 
-		@SuppressWarnings("unchecked")
+		@SuppressWarnings({"rawtypes", "unchecked"})
 		private Reference<K, V>[] createReferenceArray(int size) {
-			return (Reference<K, V>[]) Array.newInstance(Reference.class, size);
+			return new Reference[size];
 		}
 
 		private int getIndex(int hash, Reference<K, V>[] references) {