ID       uint
			Level1s  []Level1
			Level3ID uint
		}
		Level3 struct {
			ID     uint
			Name   string
			Level2 Level2
		}
	)
	DB.Migrator().DropTable(&Level3{}, &Level2{}, &Level1{})
	if err := DB.AutoMigrate(&Level3{}, &Level2{}, &Level1{}); err != nil {
		t.Error(err)
	}

	want := make([]Level3, 2)
	want[0] = Level3{
		Level2: Level2{
			Level1s: []Level1{
				{Value: "value1"},

        RequestTrace level1 = new RequestTrace("level1", root, "level1-data");
        RequestTrace level2 = new RequestTrace("level2", level1, "level2-data");
        RequestTrace level3 = new RequestTrace(level2, "level3-data");

        // Verify the chain
        assertNull(root.parent());
        assertEquals(root, level1.parent());
        assertEquals(level1, level2.parent());

     *
     * @param level the severity level of the message
     * @param message the message to be logged
     */
    default void log(@Nonnull Level level, @Nonnull String message) {
        log(level, message, null);
    }

    /**
     * Logs a message at the specified level with an associated exception.
     *
     * @param level the severity level of the message

 The Maven Team
 -----

Configuration levels in maven

 In maven configuration control happens on four differ levels: the site level, the group level,
 the project level, and the user level. On the site level you can configure maven for all users
 utilizing the local installation, the group level allows configuration management for all the projects
 that belong to the same group, the project level allows configuration management at

    if (bubbledTo == vacated) {
      // Could not bubble toTrickle up min levels, try moving
      // it from min level to max level (or max to min level) and bubble up
      // there.
      return heap.tryCrossOverAndBubbleUp(index, vacated, toTrickle);
    } else {
      return (bubbledTo < index) ? new MoveDesc<E>(toTrickle, elementData(index)) : null;
    }
  }

   * Returns the ancestor of the current domain at the given number of levels "higher" (rightward)
   * in the subdomain list. The number of levels must be non-negative, and less than {@code N-1},
   * where {@code N} is the number of parts in the domain.
   *
   * <p>TODO: Reasonable candidate for addition to public API.
   */
  private InternetDomainName ancestor(int levels) {

     *
     * @return The message describing this problem, never {@code null}.
     */
    String getMessage();

    /**
     * Gets the severity level of this problem.
     *
     * @return The severity level of this problem, never {@code null}.
     */
    Severity getSeverity();

 |
 |  1. User Level. This toolchains.xml file provides configuration for a single user,
 |                 and is normally provided in ${user.home}/.m2/toolchains.xml.
 |
 |                 NOTE: This location can be overridden with the CLI option:
 |
 |                 -t /path/to/user/toolchains.xml
 |
 |  2. Installation Level.

     *
     * @return The message describing this problem, never {@code null}.
     */
    String getMessage();

    /**
     * Gets the severity level of this problem.
     *
     * @return The severity level of this problem, never {@code null}.
     */
    Severity getSeverity();

 *       <ul>
 *         <li>2 levels: average of 64ns per lock()/unlock()
 *         <li>3 levels: average of 77ns per lock()/unlock()
 *         <li>4 levels: average of 99ns per lock()/unlock()
 *         <li>5 levels: average of 103ns per lock()/unlock()
 *         <li>10 levels: average of 184ns per lock()/unlock()
 *         <li>20 levels: average of 393ns per lock()/unlock()
 *       </ul>
 * </ul>