Avoid stacktrace if root resource is not resolvable in file system

Issue: SPR-17417

(cherry picked from commit 83a54dba7e)

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2018 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.
@@ -17,6 +17,7 @@
 package org.springframework.core.io.support;
 
 import java.io.File;
+import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.lang.reflect.InvocationHandler;
 import java.lang.reflect.Method;
@@ -170,7 +171,7 @@ import org.springframework.util.StringUtils;
  * @author Colin Sampaleanu
  * @author Marius Bogoevici
  * @author Costin Leau
- * @author Phil Webb
+ * @author Phillip Webb
  * @since 1.0.2
  * @see #CLASSPATH_ALL_URL_PREFIX
  * @see org.springframework.util.AntPathMatcher
@@ -716,10 +717,16 @@ public class PathMatchingResourcePatternResolver implements ResourcePatternResol
 		try {
 			rootDir = rootDirResource.getFile().getAbsoluteFile();
 		}
-		catch (IOException ex) {
+		catch (FileNotFoundException ex) {
+			if (logger.isInfoEnabled()) {
+				logger.info("Cannot search for matching files underneath " + rootDirResource +
+						" in the file system: " + ex.getMessage());
+			}
+			return Collections.emptySet();
+		}
+		catch (Exception ex) {
 			if (logger.isWarnEnabled()) {
-				logger.warn("Cannot search for matching files underneath " + rootDirResource +
-						" because it does not correspond to a directory in the file system", ex);
+				logger.warn("Failed to resolve " + rootDirResource + " in the file system: " + ex);
 			}
 			return Collections.emptySet();
 		}