apache/maven · error · IllegalStateException

ExtensionContext must not be null

Error message

ExtensionContext must not be null

What it means

Error "ExtensionContext must not be null" thrown in apache/maven.

Source

Thrown at impl/maven-testing/src/main/java/org/apache/maven/testing/di/MavenDIExtension.java:103

    /**
     * Retrieves the extension context for the current thread.
     *
     * @return The extension context, or an empty Optional if not set
     */
    protected static Optional<ExtensionContext> getContext() {
        return Optional.ofNullable(EXTENSION_CONTEXT_THREAD_LOCAL.get());
    }

    /**
     * Creates and configures the DI container for test execution.
     * Performs component discovery and sets up basic bindings.
     *
     * @throws IllegalStateException if the ExtensionContext is null, the required test class is unavailable,
     *         the required test instance is unavailable, or if container setup fails
     */
    protected Injector setupContainer(ExtensionContext context) {
        if (context == null) {
            throw new IllegalStateException("ExtensionContext must not be null");
        }
        final Class<?> testClass = context.getRequiredTestClass();
        if (testClass == null) {
            throw new IllegalStateException("Required test class is not available in ExtensionContext");
        }
        final Object testInstance = context.getRequiredTestInstance();
        if (testInstance == null) {
            throw new IllegalStateException("Required test instance is not available in ExtensionContext");
        }

        try {
            Injector injector = Injector.create();
            injector.bindInstance(ExtensionContext.class, context);
            injector.discover(testClass.getClassLoader());
            injector.bindInstance(Injector.class, injector);
            injector.bindInstance(testClass.asSubclass(Object.class), (Object) testInstance); // Safe generics handling
            return injector;
        } catch (final Exception e) {

View on GitHub (pinned to e4093d4e12)

When it happens

Trigger: Thrown at impl/maven-testing/src/main/java/org/apache/maven/testing/di/MavenDIExtension.java:103 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of apache/maven@e4093d4e12 (2026-08-21). Data as JSON: /api/errors/82b510e8339e87c7. Report an issue: GitHub.