// Clear all tree references
                        for (SmbTreeImpl tree : this.trees) {
                            try {
                                // Force release trees during emergency cleanup
                                tree.release();
                            } catch (Exception e) {
                                log.debug("Error during emergency tree cleanup", e);
                            }

/**
 * A step in a pipeline of an asynchronous computation. When the last step in the computation is
 * complete, some objects captured during the computation are closed.
 *
 * <p>A pipeline of {@code ClosingFuture}s is a tree of steps. Each step represents either an
 * asynchronously-computed intermediate value, or else an exception that indicates the failure or
 * cancellation of the operation so far. The only way to extract the value or exception from a step

				"application/vnd.powerbuilder75-s",
				"application/vnd.preminet",
				"application/vnd.previewsystems.box",
				"application/vnd.proteus.magazine",
				"application/vnd.publishare-delta-tree",
				"application/vnd.pvi.ptid1",
				"application/vnd.pwg-multiplexed",
				"application/vnd.pwg-xhtml-print+xml",
				"application/vnd.qualcomm.brew-app-res",
				"application/vnd.quark.quarkxpress",

                    }
                    break;
                }

                if (nextHead != null) {
                    // prepare remaining
                    // (e.g. set session/tree/fileid returned by the previous requests)
                    resp.prepare(nextHead);
                }
                curHead = nextHead;
            } finally {

     *
     * @param projectBuildingRequest The project building request, may be {@code null}.
     * @since 2.1
     */
    // used by maven-dependency-tree
    @Deprecated
    public void setProjectBuildingRequest(ProjectBuildingRequest projectBuildingRequest) {
        this.projectBuilderConfiguration = projectBuildingRequest;
    }

    /**