resolve build issues + address PR comments

Author: siddhijain

msal4j-sdk/src/main/java/com/microsoft/aad/msal4j/AcquireTokenByAppProviderSupplier.java

@@ -11,6 +11,8 @@
  */
 class AcquireTokenByAppProviderSupplier extends AuthenticationResultSupplier {
 
+    private static final int TWO_HOURS = 2*3600;
+
     private AppTokenProviderParameters appTokenProviderParameters;
 
     private ClientCredentialRequest clientCredentialRequest;
@@ -23,7 +25,7 @@ class AcquireTokenByAppProviderSupplier extends AuthenticationResultSupplier {
         this.appTokenProviderParameters = appTokenProviderParameters;
     }
 
-    private static void validateTokenProviderResult(TokenProviderResult tokenProviderResult) {
+    private static void validateAndUpdateTokenProviderResult(TokenProviderResult tokenProviderResult) {
         if (null == tokenProviderResult.getAccessToken() || tokenProviderResult.getAccessToken().isEmpty()) {
             handleInvalidExternalValueError(tokenProviderResult.getAccessToken());
         }
@@ -77,7 +79,7 @@ public AuthenticationResult fetchTokenUsingAppTokenProvider(AppTokenProviderPara
             throw new MsalAzureSDKException(ex);
         }
 
-        validateTokenProviderResult(tokenProviderResult);
+        validateAndUpdateTokenProviderResult(tokenProviderResult);
 
         return AuthenticationResult.builder()
                 .accessToken(tokenProviderResult.getAccessToken())