added default null for configs

src/main/java/com/inteligr8/rs/ClientConfiguration.java

@@ -18,52 +18,72 @@ public interface ClientConfiguration {
 	/**
 	 * @return The username for BASIC authentication.
 	 */
-	String getBasicAuthUsername();
+	default String getBasicAuthUsername() {
+		return null;
+	}
 
 	/**
 	 * @return The corresponding password for the username in BASIC authentication.
 	 */
-	String getBasicAuthPassword();
+	default String getBasicAuthPassword() {
+		return null;
+	}
 	
 	/**
 	 * @return The token for BEARER authorization.
 	 */
-	String getBearerToken();
+	default String getBearerToken() {
+		return null;
+	}
 	
 	/**
 	 * @return The token URL for OAuth authorization.
 	 */
-	String getOAuthTokenUrl();
+	default String getOAuthTokenUrl() {
+		return null;
+	}
 	
 	/**
 	 * @return The client ID provided by the OAuth IdP administrator.
 	 */
-	String getOAuthClientId();
+	default String getOAuthClientId() {
+		return null;
+	}
 
 	/**
 	 * @return The corresponding client secret for the client ID provided by the OAuth IdP administrator.
 	 */
-	String getOAuthClientSecret();
+	default String getOAuthClientSecret() {
+		return null;
+	}
 	
 	/**
 	 * @return The authorization code used in the OAuth Authorization Code flow.
 	 */
-	String getOAuthAuthCode();
+	default String getOAuthAuthCode() {
+		return null;
+	}
 	
 	/**
 	 * @return The redirect URL used in the OAuth Authorization Code flow.
 	 */
-	String getOAuthAuthRedirectUri();
+	default String getOAuthAuthRedirectUri() {
+		return null;
+	}
 	
 	/**
 	 * @return The username used in the OAuth Password Grant flow.
 	 */
-	String getOAuthUsername();
+	default String getOAuthUsername() {
+		return null;
+	}
 	
 	/**
 	 * @return The corresponding password for the username used in the OAuth Password Grant flow.
 	 */
-	String getOAuthPassword();
+	default String getOAuthPassword() {
+		return null;
+	}
 
 	/**
 	 * This method creates an authorization filter based on the configuration