diff --git a/adminSDK/alertcenter/quickstart/src/main/java/AdminSDKAlertCenterQuickstart.java b/adminSDK/alertcenter/quickstart/src/main/java/AdminSDKAlertCenterQuickstart.java
index d80f42eb..d8120a9f 100644
--- a/adminSDK/alertcenter/quickstart/src/main/java/AdminSDKAlertCenterQuickstart.java
+++ b/adminSDK/alertcenter/quickstart/src/main/java/AdminSDKAlertCenterQuickstart.java
@@ -27,6 +27,7 @@
 import com.google.auth.http.HttpCredentialsAdapter;
 import com.google.auth.oauth2.GoogleCredentials;
 import com.google.auth.oauth2.ServiceAccountCredentials;
+import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
 import java.security.GeneralSecurityException;
@@ -58,7 +59,7 @@ private static Credentials getCredentials(String delegatedAdminEmail) throws IOE
     // [START admin_sdk_alertcenter_get_credentials]
     InputStream in = AdminSDKAlertCenterQuickstart.class.getResourceAsStream(CREDENTIALS_FILE_PATH);
     if (in == null) {
-      throw new IOException("Credential file was not found");
+      throw new FileNotFoundException("Resource not found: " + CREDENTIALS_FILE_PATH);
     }
     GoogleCredentials credentials = ServiceAccountCredentials
         .fromStream(in)
diff --git a/adminSDK/directory/quickstart/src/main/java/AdminSDKDirectoryQuickstart.java b/adminSDK/directory/quickstart/src/main/java/AdminSDKDirectoryQuickstart.java
index 9348503c..9c89edb5 100644
--- a/adminSDK/directory/quickstart/src/main/java/AdminSDKDirectoryQuickstart.java
+++ b/adminSDK/directory/quickstart/src/main/java/AdminSDKDirectoryQuickstart.java
@@ -28,6 +28,7 @@
 import com.google.api.services.admin.directory.model.User;
 import com.google.api.services.admin.directory.model.Users;
 
+import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
@@ -56,6 +57,9 @@ public class AdminSDKDirectoryQuickstart {
     private static Credential getCredentials(final NetHttpTransport HTTP_TRANSPORT) throws IOException {
         // Load client secrets.
         InputStream in = AdminSDKDirectoryQuickstart.class.getResourceAsStream(CREDENTIALS_FILE_PATH);
+        if (in == null) {
+            throw new FileNotFoundException("Resource not found: " + CREDENTIALS_FILE_PATH);
+        }
         GoogleClientSecrets clientSecrets = GoogleClientSecrets.load(JSON_FACTORY, new InputStreamReader(in));
 
         // Build flow and trigger user authorization request.
diff --git a/adminSDK/reports/quickstart/src/main/java/AdminSDKReportsQuickstart.java b/adminSDK/reports/quickstart/src/main/java/AdminSDKReportsQuickstart.java
index d1ec5d1e..d5119f82 100644
--- a/adminSDK/reports/quickstart/src/main/java/AdminSDKReportsQuickstart.java
+++ b/adminSDK/reports/quickstart/src/main/java/AdminSDKReportsQuickstart.java
@@ -28,6 +28,7 @@
 import com.google.api.services.admin.reports.model.Activities;
 import com.google.api.services.admin.reports.model.Activity;
 
+import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
@@ -56,6 +57,9 @@ public class AdminSDKReportsQuickstart {
     private static Credential getCredentials(final NetHttpTransport HTTP_TRANSPORT) throws IOException {
         // Load client secrets.
         InputStream in = AdminSDKReportsQuickstart.class.getResourceAsStream(CREDENTIALS_FILE_PATH);
+        if (in == null) {
+            throw new FileNotFoundException("Resource not found: " + CREDENTIALS_FILE_PATH);
+        }
         GoogleClientSecrets clientSecrets = GoogleClientSecrets.load(JSON_FACTORY, new InputStreamReader(in));
 
         // Build flow and trigger user authorization request.
diff --git a/adminSDK/reseller/quickstart/src/main/java/AdminSDKResellerQuickstart.java b/adminSDK/reseller/quickstart/src/main/java/AdminSDKResellerQuickstart.java
index e1070471..2e6cde80 100644
--- a/adminSDK/reseller/quickstart/src/main/java/AdminSDKResellerQuickstart.java
+++ b/adminSDK/reseller/quickstart/src/main/java/AdminSDKResellerQuickstart.java
@@ -28,6 +28,7 @@
 import com.google.api.services.reseller.model.Subscription;
 import com.google.api.services.reseller.model.Subscriptions;
 
+import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
@@ -56,6 +57,9 @@ public class AdminSDKResellerQuickstart {
     private static Credential getCredentials(final NetHttpTransport HTTP_TRANSPORT) throws IOException {
         // Load client secrets.
         InputStream in = AdminSDKResellerQuickstart.class.getResourceAsStream(CREDENTIALS_FILE_PATH);
+        if (in == null) {
+            throw new FileNotFoundException("Resource not found: " + CREDENTIALS_FILE_PATH);
+        }
         GoogleClientSecrets clientSecrets = GoogleClientSecrets.load(JSON_FACTORY, new InputStreamReader(in));
 
         // Build flow and trigger user authorization request.
diff --git a/appsScript/quickstart/src/main/java/AppsScriptQuickstart.java b/appsScript/quickstart/src/main/java/AppsScriptQuickstart.java
index 4f24474a..c7f4679a 100644
--- a/appsScript/quickstart/src/main/java/AppsScriptQuickstart.java
+++ b/appsScript/quickstart/src/main/java/AppsScriptQuickstart.java
@@ -29,6 +29,7 @@
 import com.google.api.services.script.model.File;
 import com.google.api.services.script.model.Project;
 
+import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
@@ -58,6 +59,9 @@ public class AppsScriptQuickstart {
     private static Credential getCredentials(final NetHttpTransport HTTP_TRANSPORT) throws IOException {
         // Load client secrets.
         InputStream in = AppsScriptQuickstart.class.getResourceAsStream(CREDENTIALS_FILE_PATH);
+        if (in == null) {
+            throw new FileNotFoundException("Resource not found: " + CREDENTIALS_FILE_PATH);
+        }
         GoogleClientSecrets clientSecrets = GoogleClientSecrets.load(JSON_FACTORY, new InputStreamReader(in));
 
         // Build flow and trigger user authorization request.
diff --git a/calendar/quickstart/src/main/java/CalendarQuickstart.java b/calendar/quickstart/src/main/java/CalendarQuickstart.java
index 66a863ca..f173a632 100644
--- a/calendar/quickstart/src/main/java/CalendarQuickstart.java
+++ b/calendar/quickstart/src/main/java/CalendarQuickstart.java
@@ -29,6 +29,7 @@
 import com.google.api.services.calendar.model.Event;
 import com.google.api.services.calendar.model.Events;
 
+import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
@@ -57,6 +58,9 @@ public class CalendarQuickstart {
     private static Credential getCredentials(final NetHttpTransport HTTP_TRANSPORT) throws IOException {
         // Load client secrets.
         InputStream in = CalendarQuickstart.class.getResourceAsStream(CREDENTIALS_FILE_PATH);
+        if (in == null) {
+            throw new FileNotFoundException("Resource not found: " + CREDENTIALS_FILE_PATH);
+        }
         GoogleClientSecrets clientSecrets = GoogleClientSecrets.load(JSON_FACTORY, new InputStreamReader(in));
 
         // Build flow and trigger user authorization request.
diff --git a/classroom/quickstart/src/main/java/ClassroomQuickstart.java b/classroom/quickstart/src/main/java/ClassroomQuickstart.java
index dc32692c..e95381da 100644
--- a/classroom/quickstart/src/main/java/ClassroomQuickstart.java
+++ b/classroom/quickstart/src/main/java/ClassroomQuickstart.java
@@ -27,6 +27,7 @@
 import com.google.api.services.classroom.model.*;
 import com.google.api.services.classroom.Classroom;
 
+import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
@@ -55,6 +56,9 @@ public class ClassroomQuickstart {
     private static Credential getCredentials(final NetHttpTransport HTTP_TRANSPORT) throws IOException {
         // Load client secrets.
         InputStream in = ClassroomQuickstart.class.getResourceAsStream(CREDENTIALS_FILE_PATH);
+        if (in == null) {
+            throw new FileNotFoundException("Resource not found: " + CREDENTIALS_FILE_PATH);
+        }
         GoogleClientSecrets clientSecrets = GoogleClientSecrets.load(JSON_FACTORY, new InputStreamReader(in));
 
         // Build flow and trigger user authorization request.
diff --git a/docs/quickstart/src/main/java/DocsQuickstart.java b/docs/quickstart/src/main/java/DocsQuickstart.java
index c79fa7fe..4943612d 100644
--- a/docs/quickstart/src/main/java/DocsQuickstart.java
+++ b/docs/quickstart/src/main/java/DocsQuickstart.java
@@ -27,6 +27,7 @@
 import com.google.api.services.docs.v1.DocsScopes;
 import com.google.api.services.docs.v1.model.Document;
 
+import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
@@ -56,6 +57,9 @@ public class DocsQuickstart {
     private static Credential getCredentials(final NetHttpTransport HTTP_TRANSPORT) throws IOException {
         // Load client secrets.
         InputStream in = DocsQuickstart.class.getResourceAsStream(CREDENTIALS_FILE_PATH);
+        if (in == null) {
+            throw new FileNotFoundException("Resource not found: " + CREDENTIALS_FILE_PATH);
+        }
         GoogleClientSecrets clientSecrets = GoogleClientSecrets.load(JSON_FACTORY, new InputStreamReader(in));
 
         // Build flow and trigger user authorization request.
diff --git a/drive/activity-v2/quickstart/src/main/java/DriveActivityQuickstart.java b/drive/activity-v2/quickstart/src/main/java/DriveActivityQuickstart.java
index 1bdae385..069ac381 100644
--- a/drive/activity-v2/quickstart/src/main/java/DriveActivityQuickstart.java
+++ b/drive/activity-v2/quickstart/src/main/java/DriveActivityQuickstart.java
@@ -25,6 +25,7 @@
 import com.google.api.client.util.store.FileDataStoreFactory;
 import com.google.api.services.driveactivity.v2.DriveActivityScopes;
 import com.google.api.services.driveactivity.v2.model.*;
+import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
@@ -78,6 +79,9 @@ public class DriveActivityQuickstart {
     public static Credential authorize() throws IOException {
         // Load client secrets.
         InputStream in = DriveActivityQuickstart.class.getResourceAsStream("/credentials.json");
+        if (in == null) {
+            throw new FileNotFoundException("Resource not found: " + CREDENTIALS_FILE_PATH);
+        }
         GoogleClientSecrets clientSecrets =
                 GoogleClientSecrets.load(JSON_FACTORY, new InputStreamReader(in));
 
diff --git a/drive/activity/quickstart/src/main/java/DriveActivityQuickstart.java b/drive/activity/quickstart/src/main/java/DriveActivityQuickstart.java
index 8d445ef8..0c59333b 100644
--- a/drive/activity/quickstart/src/main/java/DriveActivityQuickstart.java
+++ b/drive/activity/quickstart/src/main/java/DriveActivityQuickstart.java
@@ -28,6 +28,7 @@
 import com.google.api.services.appsactivity.model.*;
 import com.google.api.services.appsactivity.Appsactivity;
 
+import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
@@ -79,8 +80,11 @@ public static Credential authorize() throws IOException {
         // Load client secrets.
         InputStream in =
             DriveActivityQuickstart.class.getResourceAsStream("/credentials.json");
+        if (in == null) {
+            throw new FileNotFoundException("Resource not found: " + CREDENTIALS_FILE_PATH);
+        }
         GoogleClientSecrets clientSecrets =
-            GoogleClientSecrets.load(JSON_FACTORY, new InputStreamReader(in));
+                GoogleClientSecrets.load(JSON_FACTORY, new InputStreamReader(in));
 
         // Build flow and trigger user authorization request.
         GoogleAuthorizationCodeFlow flow =
diff --git a/drive/quickstart/src/main/java/DriveQuickstart.java b/drive/quickstart/src/main/java/DriveQuickstart.java
index 509b4ada..33b6ae9e 100644
--- a/drive/quickstart/src/main/java/DriveQuickstart.java
+++ b/drive/quickstart/src/main/java/DriveQuickstart.java
@@ -28,6 +28,7 @@
 import com.google.api.services.drive.model.File;
 import com.google.api.services.drive.model.FileList;
 
+import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
@@ -56,6 +57,9 @@ public class DriveQuickstart {
     private static Credential getCredentials(final NetHttpTransport HTTP_TRANSPORT) throws IOException {
         // Load client secrets.
         InputStream in = DriveQuickstart.class.getResourceAsStream(CREDENTIALS_FILE_PATH);
+        if (in == null) {
+            throw new FileNotFoundException("Resource not found: " + CREDENTIALS_FILE_PATH);
+        }
         GoogleClientSecrets clientSecrets = GoogleClientSecrets.load(JSON_FACTORY, new InputStreamReader(in));
 
         // Build flow and trigger user authorization request.
diff --git a/gmail/quickstart/src/main/java/GmailQuickstart.java b/gmail/quickstart/src/main/java/GmailQuickstart.java
index 27c06bc5..4aee4cfc 100644
--- a/gmail/quickstart/src/main/java/GmailQuickstart.java
+++ b/gmail/quickstart/src/main/java/GmailQuickstart.java
@@ -28,6 +28,7 @@
 import com.google.api.services.gmail.model.Label;
 import com.google.api.services.gmail.model.ListLabelsResponse;
 
+import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
@@ -56,6 +57,9 @@ public class GmailQuickstart {
     private static Credential getCredentials(final NetHttpTransport HTTP_TRANSPORT) throws IOException {
         // Load client secrets.
         InputStream in = GmailQuickstart.class.getResourceAsStream(CREDENTIALS_FILE_PATH);
+        if (in == null) {
+            throw new FileNotFoundException("Resource not found: " + CREDENTIALS_FILE_PATH);
+        }
         GoogleClientSecrets clientSecrets = GoogleClientSecrets.load(JSON_FACTORY, new InputStreamReader(in));
 
         // Build flow and trigger user authorization request.
diff --git a/people/quickstart/src/main/java/PeopleQuickstart.java b/people/quickstart/src/main/java/PeopleQuickstart.java
index 26e5d93e..c50f86a0 100644
--- a/people/quickstart/src/main/java/PeopleQuickstart.java
+++ b/people/quickstart/src/main/java/PeopleQuickstart.java
@@ -29,6 +29,7 @@
 import com.google.api.services.people.v1.model.Name;
 import com.google.api.services.people.v1.model.Person;
 
+import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
@@ -57,6 +58,9 @@ public class PeopleQuickstart {
     private static Credential getCredentials(final NetHttpTransport HTTP_TRANSPORT) throws IOException {
         // Load client secrets.
         InputStream in = PeopleQuickstart.class.getResourceAsStream(CREDENTIALS_FILE_PATH);
+        if (in == null) {
+            throw new FileNotFoundException("Resource not found: " + CREDENTIALS_FILE_PATH);
+        }
         GoogleClientSecrets clientSecrets = GoogleClientSecrets.load(JSON_FACTORY, new InputStreamReader(in));
 
         // Build flow and trigger user authorization request.
diff --git a/sheets/quickstart/src/main/java/SheetsQuickstart.java b/sheets/quickstart/src/main/java/SheetsQuickstart.java
index 48bbea47..b0eddd07 100644
--- a/sheets/quickstart/src/main/java/SheetsQuickstart.java
+++ b/sheets/quickstart/src/main/java/SheetsQuickstart.java
@@ -27,6 +27,7 @@
 import com.google.api.services.sheets.v4.SheetsScopes;
 import com.google.api.services.sheets.v4.model.ValueRange;
 
+import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
@@ -55,6 +56,9 @@ public class SheetsQuickstart {
     private static Credential getCredentials(final NetHttpTransport HTTP_TRANSPORT) throws IOException {
         // Load client secrets.
         InputStream in = SheetsQuickstart.class.getResourceAsStream(CREDENTIALS_FILE_PATH);
+        if (in == null) {
+            throw new FileNotFoundException("Resource not found: " + CREDENTIALS_FILE_PATH);
+        }
         GoogleClientSecrets clientSecrets = GoogleClientSecrets.load(JSON_FACTORY, new InputStreamReader(in));
 
         // Build flow and trigger user authorization request.
diff --git a/slides/quickstart/src/main/java/SlidesQuickstart.java b/slides/quickstart/src/main/java/SlidesQuickstart.java
index 02e7be38..63c06d47 100644
--- a/slides/quickstart/src/main/java/SlidesQuickstart.java
+++ b/slides/quickstart/src/main/java/SlidesQuickstart.java
@@ -28,6 +28,7 @@
 import com.google.api.services.slides.v1.model.Page;
 import com.google.api.services.slides.v1.model.Presentation;
 
+import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
@@ -56,6 +57,9 @@ public class SlidesQuickstart {
     private static Credential getCredentials(final NetHttpTransport HTTP_TRANSPORT) throws IOException {
         // Load client secrets.
         InputStream in = SlidesQuickstart.class.getResourceAsStream(CREDENTIALS_FILE_PATH);
+        if (in == null) {
+            throw new FileNotFoundException("Resource not found: " + CREDENTIALS_FILE_PATH);
+        }
         GoogleClientSecrets clientSecrets = GoogleClientSecrets.load(JSON_FACTORY, new InputStreamReader(in));
 
         // Build flow and trigger user authorization request.
diff --git a/tasks/quickstart/src/main/java/TasksQuickstart.java b/tasks/quickstart/src/main/java/TasksQuickstart.java
index d94b5f66..3b8abca9 100644
--- a/tasks/quickstart/src/main/java/TasksQuickstart.java
+++ b/tasks/quickstart/src/main/java/TasksQuickstart.java
@@ -28,6 +28,7 @@
 import com.google.api.services.tasks.model.TaskList;
 import com.google.api.services.tasks.model.TaskLists;
 
+import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
@@ -56,6 +57,9 @@ public class TasksQuickstart {
     private static Credential getCredentials(final NetHttpTransport HTTP_TRANSPORT) throws IOException {
         // Load client secrets.
         InputStream in = TasksQuickstart.class.getResourceAsStream(CREDENTIALS_FILE_PATH);
+        if (in == null) {
+            throw new FileNotFoundException("Resource not found: " + CREDENTIALS_FILE_PATH);
+        }
         GoogleClientSecrets clientSecrets = GoogleClientSecrets.load(JSON_FACTORY, new InputStreamReader(in));
 
         // Build flow and trigger user authorization request.
diff --git a/vault/quickstart/src/main/java/Quickstart.java b/vault/quickstart/src/main/java/Quickstart.java
index ec3426e6..36b2a8c2 100644
--- a/vault/quickstart/src/main/java/Quickstart.java
+++ b/vault/quickstart/src/main/java/Quickstart.java
@@ -27,6 +27,7 @@
 import com.google.api.services.vault.v1.model.*;
 import com.google.api.services.vault.v1.Vault;
 
+import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
@@ -78,8 +79,11 @@ public static Credential authorize() throws IOException {
         // Load client secrets.
         InputStream in =
             Quickstart.class.getResourceAsStream("/credentials.json");
+        if (in == null) {
+            throw new FileNotFoundException("Resource not found: " + CREDENTIALS_FILE_PATH);
+        }
         GoogleClientSecrets clientSecrets =
-            GoogleClientSecrets.load(JSON_FACTORY, new InputStreamReader(in));
+                GoogleClientSecrets.load(JSON_FACTORY, new InputStreamReader(in));
 
         // Build flow and trigger user authorization request.
         GoogleAuthorizationCodeFlow flow =