Actually fix loading locales from paths with spaces in them

proxy/src/main/java/com/velocitypowered/proxy/util/FileSystemUtils.java

@@ -18,7 +18,6 @@
 package com.velocitypowered.proxy.util;
 
 import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
-import java.io.File;
 import java.io.IOException;
 import java.net.URI;
 import java.net.URISyntaxException;
@@ -31,6 +30,7 @@ import java.nio.file.Paths;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
+import java.util.Map;
 import java.util.function.Consumer;
 
 public class FileSystemUtils {
@@ -48,11 +48,18 @@ public class FileSystemUtils {
   public static boolean visitResources(Class<?> target, Consumer<Path> consumer,
       String firstPathComponent, String... remainingPathComponents)
       throws IOException {
-    final File file = new File(target
-        .getProtectionDomain().getCodeSource().getLocation().getPath());
+    final URL knownResource = FileSystemUtils.class.getClassLoader()
+        .getResource("default-velocity.toml");
+    if (knownResource == null) {
+      throw new IllegalStateException(
+          "default-velocity.toml does not exist, don't know where we are");
+    }
+    if (knownResource.getProtocol().equals("jar")) {
+      // Running from a JAR
+      String jarPathRaw = knownResource.toString().split("!")[0];
+      URI path = URI.create(jarPathRaw + "!/");
 
-    if (file.isFile()) { // jar
-      try (FileSystem fileSystem = FileSystems.newFileSystem(file.toPath(), (ClassLoader) null)) {
+      try (FileSystem fileSystem = FileSystems.newFileSystem(path, Map.of("create", "true"))) {
         Path toVisit = fileSystem.getPath(firstPathComponent, remainingPathComponents);
         if (Files.exists(toVisit)) {
           consumer.accept(toVisit);
@@ -61,6 +68,7 @@ public class FileSystemUtils {
         return false;
       }
     } else {
+      // Running from the file system
       URI uri;
       List<String> componentList = new ArrayList<>();
       componentList.add(firstPathComponent);