new ClUnsupportedOperationException("hoge", new NullPointerException());
        assertThat(clUnsupportedOperationException.getMessage(), is("hoge"));
        assertThat(clUnsupportedOperationException.getCause(), instanceOf(NullPointerException.class));
    }

    /**
     * Test method for
     * {@link org.codelibs.core.exception.ClUnsupportedOperationException#SUnsupportedOperationException(java.lang.Throwable)}
     * .

    assertSame(cause, getRootCause(exception));
  }

  public void testGetRootCause_loop() {
    Exception cause = new Exception();
    Exception exception = new Exception(cause);
    cause.initCause(exception);
    IllegalArgumentException expected =
        assertThrows(IllegalArgumentException.class, () -> getRootCause(cause));
    assertThat(expected).hasCauseThat().isSameInstanceAs(cause);
  }

	APICode string // The API error code identifying the error
	Err     string // The error message returned to the client
	Cause   error  // Optional, lower level error cause.
}

func (e Error) Error() string {
	if e.Cause == nil {
		return e.Err
	}
	return fmt.Sprintf("%s: %v", e.Err, e.Cause)
}

func errKeyCreationFailed(err error) Error {
	return Error{
		Code:    http.StatusInternalServerError,

                throw responseManager.new400("Unsupported request type.");
            }
            return actionResponse;
        } catch (final SsoMessageException e) {
            if (e.getCause() == null) {
                if (logger.isDebugEnabled()) {
                    logger.debug("Metadata response.", e);
                }
                saveInfo(e.getMessageCode());
            } else {

     *
     * @param messageCode
     *            メッセージコード
     * @param args
     *            引数の並び
     * @param cause
     *            原因となった例外
     */
    public ClSQLException(final String messageCode, final Object[] args, final Throwable cause) {
        this(messageCode, args, null, 0, cause, null);
    }

    /**
     * {@link ClSQLException}を作成します。
     *
     * @param messageCode
     *            メッセージコード

     *
     * @param message
     *            メッセージ
     * @param cause
     *            元の例外
     */
    public ClUnsupportedOperationException(final String message, final Throwable cause) {
        super(message, cause);
    }

    /**
     * {@link ClUnsupportedOperationException}を作成します。
     *
     * @param cause
     *            元の例外
     */

    public SuggesterException(final String msg) {
        super(msg);
    }

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

    public SuggesterException(final String msg, final Throwable cause) {
        super(msg, cause);
    }

     * {@link ClassNotFoundRuntimeException}を作成します。
     *
     * @param cause
     *            原因となった例外
     */
    public ClassNotFoundRuntimeException(final ClassNotFoundException cause) {
        this(null, cause);
    }

    /**
     * {@link ClassNotFoundRuntimeException}を作成します。
     *
     * @param className
     *            クラス名
     * @param cause
     *            原因となった例外
     */

     * @param messageCode message code
     * @param cause cause of exception
     */
    public ClRuntimeException(final String messageCode, final Throwable cause) {
        this(messageCode, new Object[0], cause);
    }

    /**
     * Creates {@link ClRuntimeException}.
     *
     * @param messageCode message code
     * @param args arguments for messages
     * @param cause cause of exception
     */

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

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

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