diff --git a/samples/interactive-tutorials/src/main/java/events/ImportUserEventsBigQuery.java b/samples/interactive-tutorials/src/main/java/events/ImportUserEventsBigQuery.java
index 73c98d75..e3630e13 100644
--- a/samples/interactive-tutorials/src/main/java/events/ImportUserEventsBigQuery.java
+++ b/samples/interactive-tutorials/src/main/java/events/ImportUserEventsBigQuery.java
@@ -21,6 +21,7 @@
 package events;
 
 import com.google.api.gax.rpc.NotFoundException;
+import com.google.cloud.ServiceOptions;
 import com.google.cloud.bigquery.BigQueryException;
 import com.google.cloud.retail.v2.BigQuerySource;
 import com.google.cloud.retail.v2.ImportMetadata;
@@ -38,7 +39,7 @@ public class ImportUserEventsBigQuery {
 
   public static void main(String[] args) throws IOException, InterruptedException {
     // TODO(developer): Replace these variables before running the sample.
-    String projectId = "your-project-id";
+    String projectId = ServiceOptions.getDefaultProjectId();
     String defaultCatalog =
         String.format("projects/%s/locations/global/catalogs/default_catalog", projectId);
     // TO CHECK ERROR HANDLING PASTE THE INVALID CATALOG NAME HERE:
diff --git a/samples/interactive-tutorials/src/main/java/events/ImportUserEventsGcs.java b/samples/interactive-tutorials/src/main/java/events/ImportUserEventsGcs.java
index 6abb57bd..3128f9ba 100644
--- a/samples/interactive-tutorials/src/main/java/events/ImportUserEventsGcs.java
+++ b/samples/interactive-tutorials/src/main/java/events/ImportUserEventsGcs.java
@@ -22,6 +22,7 @@
 
 import com.google.api.gax.rpc.InvalidArgumentException;
 import com.google.api.gax.rpc.PermissionDeniedException;
+import com.google.cloud.ServiceOptions;
 import com.google.cloud.retail.v2.GcsSource;
 import com.google.cloud.retail.v2.ImportErrorsConfig;
 import com.google.cloud.retail.v2.ImportMetadata;
@@ -39,7 +40,7 @@ public class ImportUserEventsGcs {
 
   public static void main(String[] args) throws IOException, InterruptedException {
     // TODO(developer): Replace these variables before running the sample.
-    String projectId = "your-project-id";
+    String projectId = ServiceOptions.getDefaultProjectId();
     String defaultCatalog =
         String.format("projects/%s/locations/global/catalogs/default_catalog", projectId);
     // TO CHECK ERROR HANDLING PASTE THE INVALID CATALOG NAME HERE:
diff --git a/samples/interactive-tutorials/src/main/java/events/ImportUserEventsInline.java b/samples/interactive-tutorials/src/main/java/events/ImportUserEventsInline.java
index 44cf661e..d7e88229 100644
--- a/samples/interactive-tutorials/src/main/java/events/ImportUserEventsInline.java
+++ b/samples/interactive-tutorials/src/main/java/events/ImportUserEventsInline.java
@@ -21,6 +21,7 @@
 package events;
 
 import com.google.api.gax.longrunning.OperationFuture;
+import com.google.cloud.ServiceOptions;
 import com.google.cloud.bigquery.BigQueryException;
 import com.google.cloud.retail.v2.ImportMetadata;
 import com.google.cloud.retail.v2.ImportUserEventsRequest;
@@ -43,7 +44,7 @@ public class ImportUserEventsInline {
   public static void main(String[] args)
       throws IOException, ExecutionException, InterruptedException {
     // TODO(developer): Replace these variables before running the sample.
-    String projectId = "your-project-id";
+    String projectId = ServiceOptions.getDefaultProjectId();
     String defaultCatalog =
         String.format("projects/%s/locations/global/catalogs/default_catalog", projectId);
 
diff --git a/samples/interactive-tutorials/src/main/java/events/PurgeUserEvent.java b/samples/interactive-tutorials/src/main/java/events/PurgeUserEvent.java
index 31e3d680..2dc99f29 100644
--- a/samples/interactive-tutorials/src/main/java/events/PurgeUserEvent.java
+++ b/samples/interactive-tutorials/src/main/java/events/PurgeUserEvent.java
@@ -23,6 +23,7 @@
 import static setup.SetupCleanup.writeUserEvent;
 
 import com.google.api.gax.longrunning.OperationFuture;
+import com.google.cloud.ServiceOptions;
 import com.google.cloud.retail.v2.PurgeMetadata;
 import com.google.cloud.retail.v2.PurgeUserEventsRequest;
 import com.google.cloud.retail.v2.PurgeUserEventsResponse;
@@ -36,7 +37,7 @@ public class PurgeUserEvent {
   public static void main(String[] args)
       throws IOException, ExecutionException, InterruptedException {
     // TODO(developer): Replace these variables before running the sample.
-    String projectId = "your-project-id";
+    String projectId = ServiceOptions.getDefaultProjectId();
     String defaultCatalog =
         String.format("projects/%s/locations/global/catalogs/default_catalog", projectId);
     // visitorId generated randomly.
diff --git a/samples/interactive-tutorials/src/main/java/events/RejoinUserEvent.java b/samples/interactive-tutorials/src/main/java/events/RejoinUserEvent.java
index d97cb8fd..b695b707 100644
--- a/samples/interactive-tutorials/src/main/java/events/RejoinUserEvent.java
+++ b/samples/interactive-tutorials/src/main/java/events/RejoinUserEvent.java
@@ -24,6 +24,7 @@
 import static setup.SetupCleanup.writeUserEvent;
 
 import com.google.api.gax.longrunning.OperationFuture;
+import com.google.cloud.ServiceOptions;
 import com.google.cloud.retail.v2.RejoinUserEventsMetadata;
 import com.google.cloud.retail.v2.RejoinUserEventsRequest;
 import com.google.cloud.retail.v2.RejoinUserEventsRequest.UserEventRejoinScope;
@@ -38,7 +39,7 @@ public class RejoinUserEvent {
   public static void main(String[] args)
       throws IOException, ExecutionException, InterruptedException {
     // TODO(developer): Replace these variables before running the sample.
-    String projectId = "your-project-id";
+    String projectId = ServiceOptions.getDefaultProjectId();
     String defaultCatalog =
         String.format("projects/%s/locations/global/catalogs/default_catalog", projectId);
     // visitorId generated randomly.
diff --git a/samples/interactive-tutorials/src/main/java/events/WriteUserEvent.java b/samples/interactive-tutorials/src/main/java/events/WriteUserEvent.java
index b4b20a59..aa32b87e 100644
--- a/samples/interactive-tutorials/src/main/java/events/WriteUserEvent.java
+++ b/samples/interactive-tutorials/src/main/java/events/WriteUserEvent.java
@@ -22,6 +22,7 @@
 
 import static setup.SetupCleanup.purgeUserEvent;
 
+import com.google.cloud.ServiceOptions;
 import com.google.cloud.retail.v2.UserEvent;
 import com.google.cloud.retail.v2.UserEventServiceClient;
 import com.google.cloud.retail.v2.WriteUserEventRequest;
@@ -36,7 +37,7 @@ public class WriteUserEvent {
   public static void main(String[] args)
       throws IOException, ExecutionException, InterruptedException {
     // TODO(developer): Replace these variables before running the sample.
-    String projectId = "your-project-id";
+    String projectId = ServiceOptions.getDefaultProjectId();
     String defaultCatalog =
         String.format("projects/%s/locations/global/catalogs/default_catalog", projectId);
     // visitorId generated randomly.