* the call to {@code contains(null)} is permitted to throw a {@code NullPointerException}.
   *
   * @param message message to use upon assertion failure
   */
  protected void expectNullKeyMissingWhenNullKeysUnsupported(String message) {
    try {
      assertFalse(message, getMap().containsKey(null));
    } catch (NullPointerException tolerated) {
      // Tolerated
    }
  }

  /**

    /**
     * @return true if the <b>debug</b> error level is enabled
     */
    boolean isDebugEnabled();

    /**
     * Send a message to the user in the <b>debug</b> error level.
     *
     * @param content
     */
    void debug(CharSequence content);

    /**
     * Send a message (and accompanying exception) to the user in the <b>debug</b> error level.<br>

public class CurlException extends RuntimeException {

    private static final long serialVersionUID = 1L;

    public CurlException(final String message, final Throwable cause) {
        super(message, cause);
    }

    public CurlException(final String message) {
        super(message);
    }

    private static final long serialVersionUID = 1L;

    public CommandExecutionException(final String message) {
        super(message);
    }

    public CommandExecutionException(final String message, final Throwable e) {
        super(message, e);
    }

public class PluginException extends FessSystemException {

    private static final long serialVersionUID = 1L;

    public PluginException(final String message, final Throwable cause) {
        super(message, cause);
    }

    public PluginException(final String message) {
        super(message);
    }

public class ThemeException extends FessSystemException {

    private static final long serialVersionUID = 1L;

    public ThemeException(final String message, final Throwable cause) {
        super(message, cause);
    }

    public ThemeException(final String message) {
        super(message);
    }

    private static final long serialVersionUID = 1L;

    public ThumbnailGenerationException(final String message, final Exception cause) {
        super(message, cause);
    }

    public ThumbnailGenerationException(final String message) {
        super(message, false, false);
    }

    default void add(BuilderProblem.Severity severity, ModelProblem.Version version, String message) {
        add(severity, version, message, null, null);
    }

    default void add(
            BuilderProblem.Severity severity, ModelProblem.Version version, String message, InputLocation location) {
        add(severity, version, message, location, null);
    }

    default void add(

```json hl_lines="4-16"
{
    "components": {
        "schemas": {
            "Message": {
                "title": "Message",
                "required": [
                    "message"
                ],
                "type": "object",
                "properties": {
                    "message": {
                        "title": "Message",
                        "type": "string"
                    }
                }

    private static final long serialVersionUID = 1L;

    public SearchQueryException(final String message, final Throwable cause) {
        super(message, cause);
    }

    public SearchQueryException(final String message) {
        super(message);
    }

    public SearchQueryException(final Throwable cause) {
        super(cause);
    }