Close mapping streams after the ValidatorFactory has been built

Closes gh-26418

Author: jhoeller

spring-context/src/main/java/org/springframework/validation/beanvalidation/LocalValidatorFactoryBean.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2021 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -17,8 +17,10 @@
 package org.springframework.validation.beanvalidation;
 
 import java.io.IOException;
+import java.io.InputStream;
 import java.lang.reflect.Constructor;
 import java.lang.reflect.Method;
+import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.HashMap;
 import java.util.List;
@@ -291,12 +293,17 @@ public void afterPropertiesSet() {
 			configureParameterNameProvider(this.parameterNameDiscoverer, configuration);
 		}
 
+		List<InputStream> mappingStreams = null;
 		if (this.mappingLocations != null) {
+			mappingStreams = new ArrayList<>(this.mappingLocations.length);
 			for (Resource location : this.mappingLocations) {
 				try {
-					configuration.addMapping(location.getInputStream());
+					InputStream stream = location.getInputStream();
+					mappingStreams.add(stream);
+					configuration.addMapping(stream);
 				}
 				catch (IOException ex) {
+					closeMappingStreams(mappingStreams);
 					throw new IllegalStateException("Cannot read mapping resource: " + location);
 				}
 			}
@@ -307,8 +314,13 @@ public void afterPropertiesSet() {
 		// Allow for custom post-processing before we actually build the ValidatorFactory.
 		postProcessConfiguration(configuration);
 
-		this.validatorFactory = configuration.buildValidatorFactory();
-		setTargetValidator(this.validatorFactory.getValidator());
+		try {
+			this.validatorFactory = configuration.buildValidatorFactory();
+			setTargetValidator(this.validatorFactory.getValidator());
+		}
+		finally {
+			closeMappingStreams(mappingStreams);
+		}
 	}
 
 	private void configureParameterNameProvider(ParameterNameDiscoverer discoverer, Configuration<?> configuration) {
@@ -329,6 +341,18 @@ public List<String> getParameterNames(Method method) {
 		});
 	}
 
+	private void closeMappingStreams(@Nullable List<InputStream> mappingStreams){
+		if (!CollectionUtils.isEmpty(mappingStreams)) {
+			for (InputStream stream : mappingStreams) {
+				try {
+					stream.close();
+				}
+				catch (IOException ignored) {
+				}
+			}
+		}
+	}
+
 	/**
 	 * Post-process the given Bean Validation configuration,
 	 * adding to or overriding any of its settings.
@@ -397,15 +421,15 @@ public <T> T unwrap(@Nullable Class<T> type) {
 				return super.unwrap(type);
 			}
 			catch (ValidationException ex) {
-				// ignore - we'll try ValidatorFactory unwrapping next
+				// Ignore - we'll try ValidatorFactory unwrapping next
 			}
 		}
 		if (this.validatorFactory != null) {
 			try {
 				return this.validatorFactory.unwrap(type);
 			}
 			catch (ValidationException ex) {
-				// ignore if just being asked for ValidatorFactory
+				// Ignore if just being asked for ValidatorFactory
 				if (ValidatorFactory.class == type) {
 					return (T) this.validatorFactory;
 				}