Properties loading with ignoreResourceNotFound covers SocketException as well

Closes gh-25717

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 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.
@@ -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;
@@ -458,7 +459,8 @@ class ConfigurationClassParser {
 			catch (IOException ex) {
 				// Resource not found when trying to open it
 				if (ignoreResourceNotFound &&
-						(ex instanceof FileNotFoundException || ex instanceof UnknownHostException)) {
+						(ex instanceof FileNotFoundException || ex instanceof UnknownHostException ||
+								ex instanceof SocketException)) {
 					if (logger.isInfoEnabled()) {
 						logger.info("Properties location [" + location + "] not resolvable: " + ex.getMessage());
 					}
@@ -473,32 +475,35 @@ class ConfigurationClassParser {
 	private void addPropertySource(PropertySource<?> propertySource) {
 		String name = propertySource.getName();
 		MutablePropertySources propertySources = ((ConfigurableEnvironment) this.environment).getPropertySources();
-		if (propertySources.contains(name) && this.propertySourceNames.contains(name)) {
+
+		if (this.propertySourceNames.contains(name)) {
 			// We've already added a version, we need to extend it
 			PropertySource<?> existing = propertySources.get(name);
-			PropertySource<?> newSource = (propertySource instanceof ResourcePropertySource ?
-					((ResourcePropertySource) propertySource).withResourceName() : propertySource);
-			if (existing instanceof CompositePropertySource) {
-				((CompositePropertySource) existing).addFirstPropertySource(newSource);
-			}
-			else {
-				if (existing instanceof ResourcePropertySource) {
-					existing = ((ResourcePropertySource) existing).withResourceName();
+			if (existing != null) {
+				PropertySource<?> newSource = (propertySource instanceof ResourcePropertySource ?
+						((ResourcePropertySource) propertySource).withResourceName() : propertySource);
+				if (existing instanceof CompositePropertySource) {
+					((CompositePropertySource) existing).addFirstPropertySource(newSource);
+				}
+				else {
+					if (existing instanceof ResourcePropertySource) {
+						existing = ((ResourcePropertySource) existing).withResourceName();
+					}
+					CompositePropertySource composite = new CompositePropertySource(name);
+					composite.addPropertySource(newSource);
+					composite.addPropertySource(existing);
+					propertySources.replace(name, composite);
 				}
-				CompositePropertySource composite = new CompositePropertySource(name);
-				composite.addPropertySource(newSource);
-				composite.addPropertySource(existing);
-				propertySources.replace(name, composite);
+				return;
 			}
 		}
+
+		if (this.propertySourceNames.isEmpty()) {
+			propertySources.addLast(propertySource);
+		}
 		else {
-			if (this.propertySourceNames.isEmpty()) {
-				propertySources.addLast(propertySource);
-			}
-			else {
-				String firstProcessed = this.propertySourceNames.get(this.propertySourceNames.size() - 1);
-				propertySources.addBefore(firstProcessed, propertySource);
-			}
+			String firstProcessed = this.propertySourceNames.get(this.propertySourceNames.size() - 1);
+			propertySources.addBefore(firstProcessed, propertySource);
 		}
 		this.propertySourceNames.add(name);
 	}
@@ -675,7 +680,7 @@ class ConfigurationClassParser {
 	}
 
 	/**
-	 * Factory method to obtain {@link SourceClass}s from class names.
+	 * Factory method to obtain a {@link SourceClass} collection from class names.
 	 */
 	private Collection<SourceClass> asSourceClasses(String[] classNames) throws IOException {
 		List<SourceClass> annotatedClasses = new ArrayList<SourceClass>(classNames.length);

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 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;
 
@@ -180,7 +181,8 @@ public abstract class PropertiesLoaderSupport {
 				catch (IOException ex) {
 					// Resource not found when trying to open it
 					if (this.ignoreResourceNotFound &&
-							(ex instanceof FileNotFoundException || ex instanceof UnknownHostException)) {
+							(ex instanceof FileNotFoundException || ex instanceof UnknownHostException ||
+									ex instanceof SocketException)) {
 						if (logger.isInfoEnabled()) {
 							logger.info("Properties resource not found: " + ex.getMessage());
 						}