} catch (SMBProtocolDecodingException e) {
            // If exception thrown, validation is working
            assertTrue(e.getMessage().contains("Invalid negotiate context data length") || e.getMessage().contains("Buffer too small")
                    || e.getMessage().contains("negotiate context"), "Validation detected issue: " + e.getMessage());
        }
    }

    /**

        // Then
        assertNotNull(str);
        assertTrue(str.contains("SmbOperationException"));
        assertTrue(str.contains("ACCESS_DENIED"));
        assertTrue(str.contains("AUTHENTICATION"));
        assertTrue(str.contains("retryable=false"));
        assertTrue(str.contains("attempt=1"));
        assertTrue(str.contains("context="));
        assertTrue(str.contains("elapsed="));
    }

    @Test

For a quick installation, docker-compose reference configs are also available on the [Keycloak GitHub](https://github.com/keycloak/keycloak-containers/tree/main/docker-compose-examples).

### Configure Keycloak Realm

- Go to Clients
  - Click on account
    - Settings
    - Change `Access Type` to `confidential`.
    - Save
  - Click on credentials tab

     * which hold TGT retrieved from KDC. If multiple TGT are contained, the
     * first one will be used to retrieve user principal.
     *
     * @param subject
     *            represents the user who perform Kerberos authentication.
     *            It contains tickets retrieve from KDC.
     */
    public Kerb5Authenticator(Subject subject) {
        this.subject = subject;

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