Fix FileUtil.read when url is in a jar (classpath resources)

vertigo-core/src/main/java/io/vertigo/core/util/FileUtil.java

@@ -23,12 +23,15 @@
 import java.net.URISyntaxException;
 import java.net.URL;
 import java.nio.charset.StandardCharsets;
+import java.nio.file.FileSystem;
+import java.nio.file.FileSystems;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.nio.file.StandardCopyOption;
 import java.util.List;
 import java.util.Locale;
+import java.util.Map;
 import java.util.regex.Pattern;
 
 import io.vertigo.core.lang.Assertion;
@@ -65,16 +68,26 @@ public static String read(final URL url) {
 		Assertion.check().isNotNull(url);
 		//---
 		try {
-			final Path path = Paths.get(url.toURI());
-			final List<String> lines = Files.readAllLines(path, StandardCharsets.UTF_8);
-			return String.join("\r\n", lines);
+			final var uri = url.toURI();
+			if ("jar".equalsIgnoreCase(uri.getScheme())) {
+				try (final FileSystem fs = FileSystems.newFileSystem(url.toURI(), Map.of())) { // need to "open" the jar for Paths.get to work
+					return doRead(Paths.get(uri));
+				}
+			}
+			return doRead(Paths.get(uri));
 		} catch (final IOException | URISyntaxException e) {
 			throw WrappedException.wrap(e, "Error when reading file : '{0}'", url);
 		}
 	}
 
+	private static String doRead(final Path path) throws IOException {
+		final List<String> lines = Files.readAllLines(path, StandardCharsets.UTF_8);
+		return String.join("\r\n", lines);
+	}
+
 	/**
 	 * Copie le contenu d'un flux d'entrée vers un fichier de sortie.
+	 *
 	 * @param in flux d'entrée
 	 * @param file fichier de sortie
 	 * @throws IOException Erreur d'entrée/sortie
@@ -88,6 +101,7 @@ public static void copy(final InputStream in, final File file) throws IOExceptio
 	 * <p>
 	 * This method returns the textual part of the filename after the last dot.
 	 * There must be no directory separator after the dot.
+	 *
 	 * <pre>
 	 * foo.txt      --> "txt"
 	 * a/b/c.jpg    --> "jpg"
@@ -96,8 +110,8 @@ public static void copy(final InputStream in, final File file) throws IOExceptio
 	 * </pre>
 	 * <p>
 	 * The output will be the same irrespective of the machine that the code is running on.
-	 * @param fileName Nom du fichier
 	 *
+	 * @param fileName Nom du fichier
 	 * @return the extension of the file or an empty string if none exists.
 	 * (author Apache Commons IO 1.1)
 	 */
@@ -125,6 +139,7 @@ public static String getFileExtension(final String fileName) {
 
 	/**
 	 * Replace "user.home" "user.dir" and "java.io.tmpdir" by system value.
+	 *
 	 * @param path PAth to translate
 	 * @return translated path
 	 */
@@ -137,6 +152,7 @@ public static String translatePath(final String path) {
 
 	/**
 	 * Check a filePath send by a user.
+	 *
 	 * @param userPath Path to check
 	 */
 	public static void checkUserPath(final String userPath) {
@@ -147,6 +163,7 @@ public static void checkUserPath(final String userPath) {
 
 	/**
 	 * Check a filename send by a user.
+	 *
 	 * @param userFileName FileName to check
 	 */
 	public static void checkUserFileName(final String userFileName) {