diff --git a/core/deployment/src/main/java/io/quarkus/deployment/dev/QuarkusCompiler.java b/core/deployment/src/main/java/io/quarkus/deployment/dev/QuarkusCompiler.java
index 51472ee12c0fe..5f7e30d5ed4fd 100644
--- a/core/deployment/src/main/java/io/quarkus/deployment/dev/QuarkusCompiler.java
+++ b/core/deployment/src/main/java/io/quarkus/deployment/dev/QuarkusCompiler.java
@@ -5,6 +5,7 @@
 import java.io.IOException;
 import java.net.URI;
 import java.net.URISyntaxException;
+import java.nio.file.FileSystems;
 import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.util.ArrayDeque;
@@ -23,6 +24,7 @@
 
 import io.quarkus.bootstrap.app.CuratedApplication;
 import io.quarkus.bootstrap.app.QuarkusBootstrap;
+import io.quarkus.fs.util.FileSystemProviders;
 import io.quarkus.maven.dependency.ResolvedDependency;
 import io.quarkus.paths.PathCollection;
 
@@ -74,7 +76,6 @@ public QuarkusCompiler(CuratedApplication application,
                 : context.getDevModeRunnerJarFile().getCanonicalPath();
         while (!toParse.isEmpty()) {
             Path path = toParse.poll();
-            URI uri = path.toUri();
             File file = path.toFile();
             String s = file.getAbsolutePath();
             if (!parsedFiles.contains(s)) {
@@ -82,9 +83,9 @@ public QuarkusCompiler(CuratedApplication application,
                 if (!file.exists()) {
                     continue;
                 }
-                if (uri.getScheme().equals("file")) {
+                if (path.getFileSystem() == FileSystems.getDefault()) {
                     classPathElements.add(file);
-                } else if (uri.getScheme().equals("jar")) {
+                } else if (path.getFileSystem().provider() == FileSystemProviders.ZIP_PROVIDER) {
                     // skip adding the dev mode runner jar to the classpath to prevent
                     // hitting a bug in JDK - https://bugs.openjdk.java.net/browse/JDK-8232170
                     // which causes the programmatic java file compilation to fail.
@@ -156,10 +157,10 @@ public void setupSourceCompilationContext(DevModeContext context, Set<File> clas
                         + "'. It is advised that this module be compiled before launching dev mode");
                 return;
             }
-            compilationUnit.getSourcePaths().forEach(sourcePath -> {
+            for (Path sourcePath : compilationUnit.getSourcePaths()) {
                 final String srcPathStr = sourcePath.toString();
                 if (this.compilationContexts.containsKey(srcPathStr)) {
-                    return;
+                    continue;
                 }
                 this.compilationContexts.put(srcPathStr,
                         new CompilationProvider.Context(
@@ -175,7 +176,7 @@ public void setupSourceCompilationContext(DevModeContext context, Set<File> clas
                                 context.getTargetJvmVersion(),
                                 context.getCompilerPluginArtifacts(),
                                 context.getCompilerPluginsOptions()));
-            });
+            }
         }
     }
 
diff --git a/core/runtime/src/main/java/io/quarkus/runtime/util/ClassPathUtils.java b/core/runtime/src/main/java/io/quarkus/runtime/util/ClassPathUtils.java
index a5e0b0e4ef9f6..3782c79581be0 100644
--- a/core/runtime/src/main/java/io/quarkus/runtime/util/ClassPathUtils.java
+++ b/core/runtime/src/main/java/io/quarkus/runtime/util/ClassPathUtils.java
@@ -128,9 +128,11 @@ public static <R> R processAsPath(URL url, Function<Path, R> function) {
                 throw new RuntimeException("Failed to create a URL for '" + file.substring(0, exclam) + "'", e);
             }
             try (FileSystem jarFs = ZipUtils.newFileSystem(jar)) {
-                Path localPath = jarFs.getPath("/");
+                Path localPath;
                 if (exclam >= 0) {
-                    localPath = localPath.resolve(file.substring(exclam + 1));
+                    localPath = jarFs.getPath(file.substring(exclam + 1));
+                } else {
+                    localPath = jarFs.getPath("/");
                 }
                 return function.apply(localPath);
             } catch (IOException e) {