Treat InvalidPathException like an IOException in MockServletContext

Prior to this commit, if MockServletContext was configured with a
FileSystemResourceLoader, invocations of the following methods on a
Microsoft Windows operating system resulted in an InvalidPathException
if the supplied path contained a colon (such as "C:\\temp"). This is
inconsistent with the behavior on non-Windows operating systems. In
addition, for comparable errors resulting in an IOException, those
methods (except getRealPath()) return null instead of throwing the
exception.

- getResourcePaths()
- getResource()
- getResourceAsStream()
- getRealPath()

This commit makes handling of InvalidPathException and IOException
consistent for these methods: both exceptions now result in null be
returned by these methods.

Closes spring-projectsgh-23717

Author: sbrannen

spring-test/src/main/java/org/springframework/mock/web/MockServletContext.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2019 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.
@@ -21,6 +21,7 @@
 import java.io.InputStream;
 import java.net.MalformedURLException;
 import java.net.URL;
+import java.nio.file.InvalidPathException;
 import java.util.Collections;
 import java.util.Enumeration;
 import java.util.EventListener;
@@ -294,8 +295,10 @@ public void addMimeType(String fileExtension, MediaType mimeType) {
 	@Nullable
 	public Set<String> getResourcePaths(String path) {
 		String actualPath = (path.endsWith("/") ? path : path + "/");
-		Resource resource = this.resourceLoader.getResource(getResourceLocation(actualPath));
+		String resourceLocation = getResourceLocation(actualPath);
+		Resource resource = null;
 		try {
+			resource = this.resourceLoader.getResource(resourceLocation);
 			File file = resource.getFile();
 			String[] fileList = file.list();
 			if (ObjectUtils.isEmpty(fileList)) {
@@ -311,9 +314,10 @@ public Set<String> getResourcePaths(String path) {
 			}
 			return resourcePaths;
 		}
-		catch (IOException ex) {
+		catch (InvalidPathException | IOException ex ) {
 			if (logger.isWarnEnabled()) {
-				logger.warn("Could not get resource paths for " + resource, ex);
+				logger.warn("Could not get resource paths for " +
+						(resource != null ? resource : resourceLocation), ex);
 			}
 			return null;
 		}
@@ -322,19 +326,22 @@ public Set<String> getResourcePaths(String path) {
 	@Override
 	@Nullable
 	public URL getResource(String path) throws MalformedURLException {
-		Resource resource = this.resourceLoader.getResource(getResourceLocation(path));
-		if (!resource.exists()) {
-			return null;
-		}
+		String resourceLocation = getResourceLocation(path);
+		Resource resource = null;
 		try {
+			resource = this.resourceLoader.getResource(resourceLocation);
+			if (!resource.exists()) {
+				return null;
+			}
 			return resource.getURL();
 		}
 		catch (MalformedURLException ex) {
 			throw ex;
 		}
-		catch (IOException ex) {
+		catch (InvalidPathException | IOException ex) {
 			if (logger.isWarnEnabled()) {
-				logger.warn("Could not get URL for " + resource, ex);
+				logger.warn("Could not get URL for resource " +
+						(resource != null ? resource : resourceLocation), ex);
 			}
 			return null;
 		}
@@ -343,16 +350,19 @@ public URL getResource(String path) throws MalformedURLException {
 	@Override
 	@Nullable
 	public InputStream getResourceAsStream(String path) {
-		Resource resource = this.resourceLoader.getResource(getResourceLocation(path));
-		if (!resource.exists()) {
-			return null;
-		}
+		String resourceLocation = getResourceLocation(path);
+		Resource resource = null;
 		try {
+			resource = this.resourceLoader.getResource(resourceLocation);
+			if (!resource.exists()) {
+				return null;
+			}
 			return resource.getInputStream();
 		}
-		catch (IOException ex) {
+		catch (InvalidPathException | IOException ex) {
 			if (logger.isWarnEnabled()) {
-				logger.warn("Could not open InputStream for " + resource, ex);
+				logger.warn("Could not open InputStream for resource " +
+						(resource != null ? resource : resourceLocation), ex);
 			}
 			return null;
 		}
@@ -459,13 +469,16 @@ public void log(String message, Throwable ex) {
 	@Override
 	@Nullable
 	public String getRealPath(String path) {
-		Resource resource = this.resourceLoader.getResource(getResourceLocation(path));
+		String resourceLocation = getResourceLocation(path);
+		Resource resource = null;
 		try {
+			resource = this.resourceLoader.getResource(resourceLocation);
 			return resource.getFile().getAbsolutePath();
 		}
-		catch (IOException ex) {
+		catch (InvalidPathException | IOException ex) {
 			if (logger.isWarnEnabled()) {
-				logger.warn("Could not determine real path of resource " + resource, ex);
+				logger.warn("Could not determine real path of resource " +
+						(resource != null ? resource : resourceLocation), ex);
 			}
 			return null;
 		}