Prevent duplicate files from getting onto sources

spring-boot-cli/src/main/java/org/springframework/boot/cli/util/ResourceUtils.java

@@ -115,7 +115,7 @@ public abstract class ResourceUtils {
 						continue;
 					}
 				}
-				result.add(resource.getURL().toExternalForm());
+				result.add(absolutePath(resource));
 			}
 		}
 		return result;
@@ -127,12 +127,19 @@ public abstract class ResourceUtils {
 		List<String> childFiles = new ArrayList<String>();
 		for (Resource child : children) {
 			if (!child.getFile().isDirectory()) {
-				childFiles.add(child.getURL().toExternalForm());
+				childFiles.add(absolutePath(child));
 			}
 		}
 		return childFiles;
 	}
 
+	private static String absolutePath(Resource resource) throws IOException {
+		if (!resource.getURI().getScheme().equals("file")) {
+			return resource.getURL().toExternalForm();
+		}
+		return resource.getFile().getAbsoluteFile().toURI().toString();
+	}
+
 	private static String stripLeadingSlashes(String path) {
 		while (path.startsWith("/")) {
 			path = path.substring(1);

spring-boot-cli/src/test/java/org/springframework/boot/cli/util/ResourceUtilsTests.java

@@ -16,6 +16,9 @@
 
 package org.springframework.boot.cli.util;
 
+import java.io.File;
+import java.net.URL;
+import java.net.URLClassLoader;
 import java.util.List;
 
 import org.junit.Test;
@@ -39,6 +42,16 @@ public class ResourceUtilsTests {
 		assertTrue(urls.get(0).startsWith("file:"));
 	}
 
+	@Test
+	public void duplicateResource() throws Exception {
+		URLClassLoader loader = new URLClassLoader(new URL[] {
+				new URL("file:./src/test/resources/"),
+				new File("src/test/resources/").getAbsoluteFile().toURI().toURL() });
+		List<String> urls = ResourceUtils.getUrls("classpath:init.groovy", loader);
+		assertEquals(1, urls.size());
+		assertTrue(urls.get(0).startsWith("file:"));
+	}
+
 	@Test
 	public void explicitClasspathResourceWithSlash() {
 		List<String> urls = ResourceUtils.getUrls("classpath:/init.groovy",