Exception cause2 = new RuntimeException("loop") {
            @Override
            public synchronized Throwable getCause() {
                return causeRef.get();
            }
        };
        causeRef.set(cause2);

        Plugin plugin = new Plugin();
        Exception cause = new PluginContainerException(plugin, null, null, cause2);
        cause2.initCause(cause);

 * but at Maven runtime it MAY actually use that service.
 *
 * @since 4.0.0
 */
public interface ModelVersionParser {

    /**
     * Parses the specified version string, for example "1.0".
     *
     * @param version the version string to parse, must not be {@code null}
     * @return the parsed version, never {@code null}

     *
     * @return the location of the problem, never {@code null}
     */
    @Nonnull
    String getLocation();

    /**
     * Gets the exception that caused this problem (if any).
     *
     * @return the exception that caused this problem or {@code null} if not applicable
     */
    @Nullable
    Exception getException();

    /**
     * Gets the message that describes this problem.
     *

     * Gets the current mojo execution (if any).
     *
     * @return The current mojo execution or {@code null} if not applicable.
     */
    MojoExecution getMojoExecution();

    /**
     * Gets the exception that caused the event (if any).
     *
     * @return The exception or {@code null} if none.
     */
    Exception getException();

 * artifactId, and version for the plugin; at times, the goal name for which
 * execution failed; a message detailing the problem; the ClassRealm used to
 * look up the plugin; and the Plexus exception that caused this error.
 *
 *
 */
public class PluginContainerException extends PluginManagerException {

    private ClassRealm pluginRealm;

    public PluginContainerException(

        // execute
        ToolchainPrivate[] toolchains = toolchainManager.getToolchainsForType("unknown", session);

        // verify
        verify(logger).error("Missing toolchain factory for type: unknown. Possibly caused by misconfigured project.");
        assertEquals(0, toolchains.length);
    }

    @Test
    void testToolchainsForConfiguredType() throws Exception {
        // prepare

        List<Toolchain> toolchains = toolchainManager.getToolchains(session, "unknown", null);

        assertEquals(0, toolchains.size());
        verify(logger).error("Missing toolchain factory for type: unknown. Possibly caused by misconfigured project.");
    }

    @Test
    void testModelAndFactory() {
        MavenSession session = mock(MavenSession.class);
        MavenExecutionRequest executionRequest = new DefaultMavenExecutionRequest();

     */
    @Nonnull
    List<Version> resolveVersionRange(@Nonnull ArtifactCoordinate artifact);

    /**
     * Parses the specified version string, for example "1.0".
     * <p>
     * Shortcut for {@code getService(VersionParser.class).parseVersion(...)}.
     *
     * @param version the version string to parse

/**
 * Service interface to parse {@link Version} and {@link VersionRange}.
 *
 * @since 4.0.0
 */
@Experimental
public interface VersionParser extends Service {

    /**
     * Parses the specified version string, for example "1.0".
     *
     * @param version the version string to parse, must not be {@code null}
     * @return the parsed version, never {@code null}

     *
     * @return the current mojo execution or {@code empty()} if not applicable
     */
    @Nonnull
    Optional<MojoExecution> getMojoExecution();

    /**
     * Gets the exception that caused the event (if any).
     *
     * @return the exception or {@code empty()} if none
     */
    Optional<Exception> getException();