fix: Fix login error handling when auth service is not available (#1579)

Signed-off-by: at670475 <andrea.tabone@broadcom.com>

Author: taban03

security-service-client-spring/src/main/java/org/zowe/apiml/security/client/handler/RestResponseHandler.java

@@ -49,7 +49,7 @@ public void handleBadResponse(@NotNull Exception exception, ErrorType errorType,
             throw new GatewayNotAvailableException(ErrorType.GATEWAY_NOT_AVAILABLE.getDefaultMessage(), exception);
         } else if (exception instanceof HttpServerErrorException) {
             HttpServerErrorException hseException = (HttpServerErrorException) exception;
-            if (hseException.getStatusCode().equals(HttpStatus.SERVICE_UNAVAILABLE)) {
+            if (hseException.getStatusCode().equals(HttpStatus.SERVICE_UNAVAILABLE) || hseException.getStatusCode().equals(HttpStatus.INTERNAL_SERVER_ERROR)) {
                 throw new ServiceNotAccessibleException(ErrorType.SERVICE_UNAVAILABLE.getDefaultMessage(), exception);
             } else {
                 throw hseException;

security-service-client-spring/src/test/java/org/zowe/apiml/security/client/handler/RestResponseHandlerTest.java

@@ -129,7 +129,7 @@ void handleBadResponseWithServiceUnavailable() {
     @Test
     void handleBadResponseWithHttpServerError() {
         HttpServerErrorException exception = new HttpServerErrorException(HttpStatus.INTERNAL_SERVER_ERROR, "Some server error");
-        assertThrows(HttpServerErrorException.class, () -> {
+        assertThrows(ServiceNotAccessibleException.class, () -> {
             handler.handleBadResponse(exception, null, GENERIC_LOG_MESSAGE, LOG_PARAMETERS);
         });
     }