Properties loading with ignoreResourceNotFound covers SocketException as well

Closes gh-25717

(cherry picked from commit 613b05d814)

spring-context/src/main/java/org/springframework/context/annotation/ConfigurationClassParser.java

@@ -19,6 +19,7 @@ package org.springframework.context.annotation;
 import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.lang.annotation.Annotation;
+import java.net.SocketException;
 import java.net.UnknownHostException;
 import java.util.ArrayDeque;
 import java.util.ArrayList;
@@ -451,7 +452,7 @@ class ConfigurationClassParser {
 				Resource resource = this.resourceLoader.getResource(resolvedLocation);
 				addPropertySource(factory.createPropertySource(name, new EncodedResource(resource, encoding)));
 			}
-			catch (IllegalArgumentException | FileNotFoundException | UnknownHostException ex) {
+			catch (IllegalArgumentException | FileNotFoundException | UnknownHostException | SocketException ex) {
 				// Placeholders not resolvable or resource not found when trying to open it
 				if (ignoreResourceNotFound) {
 					if (logger.isInfoEnabled()) {

spring-core/src/main/java/org/springframework/core/io/support/PropertiesLoaderSupport.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -18,6 +18,7 @@ package org.springframework.core.io.support;
 
 import java.io.FileNotFoundException;
 import java.io.IOException;
+import java.net.SocketException;
 import java.net.UnknownHostException;
 import java.util.Properties;
 
@@ -181,7 +182,7 @@ public abstract class PropertiesLoaderSupport {
 					PropertiesLoaderUtils.fillProperties(
 							props, new EncodedResource(location, this.fileEncoding), this.propertiesPersister);
 				}
-				catch (FileNotFoundException | UnknownHostException ex) {
+				catch (FileNotFoundException | UnknownHostException | SocketException ex) {
 					if (this.ignoreResourceNotFound) {
 						if (logger.isDebugEnabled()) {
 							logger.debug("Properties resource not found: " + ex.getMessage());