opts = append(opts, cr.CustomTokenValidityOpt(expiryDuration))
	}

	// Initialize
	li, err := cr.NewCustomTokenCredentials(stsEndpoint, token, roleArn, opts...)
	if err != nil {
		log.Fatalf("Error initializing CustomToken Identity: %v", err)
	}

	v, err := li.Get()
	if err != nil {
		log.Fatalf("Error retrieving STS credentials: %v", err)
	}

	if displayCreds {
		fmt.Println("Only displaying credentials:")

        assertEquals("test_stackTracePopulated", firstElement.getMethodName());
    }

    public void test_toString() {
        // Test toString method (inherited from Throwable)
        String type = "CustomToken";
        String message = "Custom token error";
        InvalidAccessTokenException exception = new InvalidAccessTokenException(type, message);

        String toStringResult = exception.toString();