if (context.parserRequest.mavenHome() != null) {
            Path result = getCanonicalPath(context.parserRequest.mavenHome());
            context.systemPropertiesOverrides.put(Constants.MAVEN_HOME, result.toString());
            return result;
        } else {
            String mavenHome = System.getProperty(Constants.MAVEN_HOME);
            if (mavenHome == null) {
                throw new IllegalStateException(

Following this checklist to help us incorporate your
contribution quickly and easily:

- [ ] Your pull request should address just one issue, without pulling in other changes.
- [ ] Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
- [ ] Each commit in the pull request should have a meaningful subject line and body.
  Note that commits might be squashed by a maintainer on merge.

                null, // effectiveModel is null
                null, // rawModel is null
                createMockModel("com.example", "test-project", "1.0.0") // fileModel is available
                );

        String projectId = (String) extractProjectIdMethod.invoke(null, mockResult);

        assertNotNull(projectId, "Project ID should not be null");
        assertEquals(

        request = new CliRequest(new String[] {"-B"}, null);
        cli.cli(request);
        cli.properties(request);
        cli.logging(request);
        assertFalse(MessageUtils.isColorEnabled(), "Expected MessageUtils.isColorEnabled() to return false");

        MessageUtils.setColorEnabled(true);
        request = new CliRequest(new String[] {"--non-interactive"}, null);
        cli.cli(request);

@Experimental
public class ModelTransformerException extends MavenException {

    public ModelTransformerException() {
        this(null, null);
    }

    public ModelTransformerException(String message) {
        this(message, null);
    }

    public ModelTransformerException(Throwable cause) {
        this(null, cause);
    }

    public ModelTransformerException(String message, Throwable cause) {
        super(message, cause);

    }

    /**
     * Gets the type of the class realm.
     *
     * @return The type of the class realm, never {@code null}.
     */
    RealmType getType();

    /**
     * Gets the parent class realm (if any).
     *
     * @return The parent class realm or {@code null} if using the default parent.
     */
    ClassLoader getParent();

    /**
     * @deprecated Use {@link #getParentImports()} instead.

     * model building.
     *
     * @param request The model building request that holds the parameters, must not be {@code null}.
     * @param result The interim result of the first phase of model building, must not be {@code null}.
     * @return The result of the model building, never {@code null}.
     * @throws ModelBuildingException If the effective model could not be built.
     */

     *
     * @param model The model to interpolate, must not be {@code null}.
     * @param projectDir The project directory, may be {@code null} if the model does not belong to a local project but
     *            to some artifact's metadata.
     * @param request The model building request that holds further settings, must not be {@code null}.

     * @param settings The settings to decrypt, must not be {@code null}.
     */
    public DefaultSettingsDecryptionRequest(Settings settings) {
        setServers(settings.getServers());
        setProxies(settings.getProxies());
    }

    /**
     * Creates a new request to decrypt the specified server.
     *
     * @param server The server to decrypt, must not be {@code null}.
     */

                }
            """
        ) {
            assertHasErrors(
                "Method com.example.Source.foo(): From non-null returning to null-unmarked returning breaking change.",
                "Method com.example.Source.baz(): From non-null returning to null-unmarked returning breaking change.",
            )
            assertHasNoWarning()