quarkusio/quarkus · error · RuntimeException

Unable to create protection domain for

Error message

Unable to create protection domain for 

What it means

Thrown from PathTreeClassPathElement.getProtectionDomain when converting the element's root Path to a URL fails with MalformedURLException, wrapped in a RuntimeException. Protection domains need a CodeSource URL; if the path cannot be expressed as a valid URL the domain cannot be built. This indicates an unrepresentable/invalid root path.

Source

Thrown at independent-projects/bootstrap/core/src/main/java/io/quarkus/bootstrap/classloading/PathTreeClassPathElement.java:176

    @Override
    public boolean containsReloadableResources() {
        return !pathTree.isArchiveOrigin();
    }

    @Override
    public ManifestAttributes getManifestAttributes() {
        return apply(OpenPathTree::getManifestAttributes);
    }

    @Override
    public ProtectionDomain getProtectionDomain() {
        URL url = null;
        final Path root = getRoot();
        try {
            url = root.toUri().toURL();
        } catch (MalformedURLException e) {
            throw new RuntimeException("Unable to create protection domain for " + root, e);
        }
        CodeSource codesource = new CodeSource(url, (Certificate[]) null);
        return new ProtectionDomain(codesource, null);
    }

    @Override
    public void close() throws IOException {
        lock.writeLock().lock();
        try {
            pathTree.close();
        } finally {
            lock.writeLock().unlock();
        }
    }

    @Override
    public String toString() {
        final StringBuilder sb = new StringBuilder();

View on GitHub (pinned to e1c734241f)

Solutions

1. Move/rename the application or its jars to a path without special characters
2. Inspect the cause MalformedURLException to see which part of the path is invalid
3. Quote/encode the path before launching the application

Example fix

// before
java -jar /path with spaces/app-runner.jar // may yield unparseable URI
// after
java -jar "/path%20with%20spaces/app-runner.jar" // or avoid spaces entirely

try {
    new URL(root.toUri().toString());
} catch (MalformedURLException e) { /* path unrepresentable: relocate app */ }

When it happens

Trigger: Calling getProtectionDomain() on an element whose root Path produces a URI that URL cannot parse (unsupported/invalid URI scheme characters in the path).

Common situations: Paths with illegal characters (spaces or special characters on some platforms/JDKs) in the directory or jar location of the application.

Related errors

• Failed to translate
• Invalid URL:
• java.io.UncheckedIOException
• Unable to create protection domain for ${jarPath}
• Failed to create output directory for generated sources: %s

AI-assisted analysis of quarkusio/quarkus@e1c734241f (2026-09-05). Data as JSON: /api/errors/3d65ecf5a1c3ec6f. Report an issue: GitHub.