* @return The new plugin realm, never {@code null}.
     */
    ClassRealm createPluginRealm(
            Plugin plugin,
            ClassLoader parent,
            List<String> parentImports,
            Map<String, ClassLoader> foreignImports,
            List<Artifact> artifacts);

    // Now set the context loader to one that should find the resource.
    URL baseUrl = tempFile.getParentFile().toURI().toURL();
    URLClassLoader loader = new URLClassLoader(new URL[] {baseUrl});
    ClassLoader oldContextLoader = Thread.currentThread().getContextClassLoader();
    try {
      Thread.currentThread().setContextClassLoader(loader);
      URL url = Resources.getResource(tempFile.getName());

  @AndroidIncompatible // "Parent ClassLoader may not be null"; maybe avoidable if we try?
  public void testGetChecked_classUnloading() throws Exception {
    WeakReference<?> classUsedByGetChecked = doTestClassUnloading();
    GcFinalization.awaitClear(classUsedByGetChecked);
  }

  /**
   * Loads {@link WillBeUnloadedException} in a separate {@code ClassLoader}, calls {@code

  @AndroidIncompatible // "Parent ClassLoader may not be null"; maybe avoidable if we try?
  public void testGetChecked_classUnloading() throws Exception {
    WeakReference<?> classUsedByGetChecked = doTestClassUnloading();
    GcFinalization.awaitClear(classUsedByGetChecked);
  }

  /**
   * Loads {@link WillBeUnloadedException} in a separate {@code ClassLoader}, calls {@code

     * The {@link Lookup} service backed by container in this capsule.
     */
    @Nonnull
    Lookup getLookup();

    /**
     * The TCCL, if implementation requires it.
     */
    @Nonnull
    Optional<ClassLoader> currentThreadClassLoader();

    /**
     * Performs a clean shutdown of backing container.
     */
    @Override
    void close() throws Exception;

     * @throws ClassNotFoundRuntimeException
     *             If the class cannot be found
     * @see Class#forName(String, boolean, ClassLoader)
     */
    @SuppressWarnings("unchecked")
    public static <T> Class<T> forName(final String className, final ClassLoader loader) throws ClassNotFoundRuntimeException {
        assertArgumentNotEmpty("className", className);
        try {

        this.packages = Collections.unmodifiableSet(new HashSet<>(packages));
        this.key = key;
        this.configuration = configuration;
    }

    /**
     * Returns ClassLoader used to load extension classes.
     */
    public ClassRealm getClassRealm() {
        return realm;
    }

    /**
     * Returns artifacts exported by the extension, identified by groupId:artifactId string key.

    // Now set the context loader to one that should find the resource.
    URL baseUrl = tempFile.getParentFile().toURI().toURL();
    URLClassLoader loader = new URLClassLoader(new URL[] {baseUrl});
    ClassLoader oldContextLoader = Thread.currentThread().getContextClassLoader();
    try {
      Thread.currentThread().setContextClassLoader(loader);
      URL url = Resources.getResource(tempFile.getName());

}

/**
 * The build environment.
 *
 * WARNING: Every val in here must not change for they same daemon. If it does, changes will go undetected,
 *          since this whole object is kept in the classloader between builds.
 *          Anything that changes must be in a val with a get() method that recomputes the value each time.
 */
object BuildEnvironment {

    /**

     */
    public static void execute(final Runnable task) {
        ForkJoinPool.commonPool().execute(() -> {
            final Thread currentThread = Thread.currentThread();
            final ClassLoader orignal = currentThread.getContextClassLoader();
            currentThread.setContextClassLoader(CommonPoolUtil.class.getClassLoader());
            try {
                task.run();
            } catch (final Exception e) {