diff --git a/samples/client/petstore/java/jersey2-java6/pom.xml b/samples/client/petstore/java/jersey2-java6/pom.xml
index 8a80c6c158..7f29de9bf6 100644
--- a/samples/client/petstore/java/jersey2-java6/pom.xml
+++ b/samples/client/petstore/java/jersey2-java6/pom.xml
@@ -210,6 +210,13 @@
             <version>${swagger-annotations-version}</version>
         </dependency>
 
+        <!-- @Nullable annotation -->
+        <dependency>
+            <groupId>com.google.code.findbugs</groupId>
+            <artifactId>jsr305</artifactId>
+            <version>3.0.2</version>
+        </dependency>
+        
         <!-- HTTP client: jersey-client -->
         <dependency>
             <groupId>org.glassfish.jersey.core</groupId>
diff --git a/samples/client/petstore/java/jersey2-java8/pom.xml b/samples/client/petstore/java/jersey2-java8/pom.xml
index 75381cb9de..5d62f179fe 100644
--- a/samples/client/petstore/java/jersey2-java8/pom.xml
+++ b/samples/client/petstore/java/jersey2-java8/pom.xml
@@ -210,6 +210,13 @@
             <version>${swagger-annotations-version}</version>
         </dependency>
 
+        <!-- @Nullable annotation -->
+        <dependency>
+            <groupId>com.google.code.findbugs</groupId>
+            <artifactId>jsr305</artifactId>
+            <version>3.0.2</version>
+        </dependency>
+        
         <!-- HTTP client: jersey-client -->
         <dependency>
             <groupId>org.glassfish.jersey.core</groupId>
diff --git a/samples/client/petstore/java/resteasy/pom.xml b/samples/client/petstore/java/resteasy/pom.xml
index ed8cee8d12..1b327454a6 100644
--- a/samples/client/petstore/java/resteasy/pom.xml
+++ b/samples/client/petstore/java/resteasy/pom.xml
@@ -160,6 +160,12 @@
             <artifactId>swagger-annotations</artifactId>
             <version>${swagger-annotations-version}</version>
         </dependency>
+        <!-- @Nullable annotation -->
+        <dependency>
+            <groupId>com.google.code.findbugs</groupId>
+            <artifactId>jsr305</artifactId>
+            <version>3.0.2</version>
+        </dependency>
         <!-- HTTP client: jersey-client -->
         <dependency>
             <groupId>org.jboss.resteasy</groupId>
diff --git a/samples/client/petstore/java/resttemplate-withXml/pom.xml b/samples/client/petstore/java/resttemplate-withXml/pom.xml
index fe4ba6cf40..03f37e2fc0 100644
--- a/samples/client/petstore/java/resttemplate-withXml/pom.xml
+++ b/samples/client/petstore/java/resttemplate-withXml/pom.xml
@@ -200,6 +200,13 @@
             <artifactId>swagger-annotations</artifactId>
             <version>${swagger-annotations-version}</version>
         </dependency>
+        
+        <!-- @Nullable annotation -->
+        <dependency>
+            <groupId>com.google.code.findbugs</groupId>
+            <artifactId>jsr305</artifactId>
+            <version>3.0.2</version>
+        </dependency>
 
         <!-- HTTP client: Spring RestTemplate -->
         <dependency>
diff --git a/samples/client/petstore/java/resttemplate/pom.xml b/samples/client/petstore/java/resttemplate/pom.xml
index ff4d882ede..3f6172a676 100644
--- a/samples/client/petstore/java/resttemplate/pom.xml
+++ b/samples/client/petstore/java/resttemplate/pom.xml
@@ -200,6 +200,13 @@
             <artifactId>swagger-annotations</artifactId>
             <version>${swagger-annotations-version}</version>
         </dependency>
+        
+        <!-- @Nullable annotation -->
+        <dependency>
+            <groupId>com.google.code.findbugs</groupId>
+            <artifactId>jsr305</artifactId>
+            <version>3.0.2</version>
+        </dependency>
 
         <!-- HTTP client: Spring RestTemplate -->
         <dependency>
diff --git a/samples/client/petstore/java/retrofit/pom.xml b/samples/client/petstore/java/retrofit/pom.xml
index 855a657653..fff98c3ba3 100644
--- a/samples/client/petstore/java/retrofit/pom.xml
+++ b/samples/client/petstore/java/retrofit/pom.xml
@@ -200,6 +200,12 @@
             <artifactId>swagger-annotations</artifactId>
             <version>${swagger-annotations-version}</version>
         </dependency>
+        <!-- @Nullable annotation -->
+        <dependency>
+            <groupId>com.google.code.findbugs</groupId>
+            <artifactId>jsr305</artifactId>
+            <version>3.0.2</version>
+        </dependency>
         <dependency>
             <groupId>com.squareup.retrofit</groupId>
             <artifactId>retrofit</artifactId>
diff --git a/samples/client/petstore/java/retrofit2-play24/pom.xml b/samples/client/petstore/java/retrofit2-play24/pom.xml
index 1a8e875825..6a8a48bd5a 100644
--- a/samples/client/petstore/java/retrofit2-play24/pom.xml
+++ b/samples/client/petstore/java/retrofit2-play24/pom.xml
@@ -191,6 +191,12 @@
             <artifactId>swagger-annotations</artifactId>
             <version>${swagger-annotations-version}</version>
         </dependency>
+        <!-- @Nullable annotation -->
+        <dependency>
+            <groupId>com.google.code.findbugs</groupId>
+            <artifactId>jsr305</artifactId>
+            <version>3.0.2</version>
+        </dependency>
         <dependency>
             <groupId>com.squareup.retrofit2</groupId>
             <artifactId>converter-gson</artifactId>
diff --git a/samples/client/petstore/java/retrofit2-play25/pom.xml b/samples/client/petstore/java/retrofit2-play25/pom.xml
index ced3973a7c..e82fe6f2b1 100644
--- a/samples/client/petstore/java/retrofit2-play25/pom.xml
+++ b/samples/client/petstore/java/retrofit2-play25/pom.xml
@@ -191,6 +191,12 @@
             <artifactId>swagger-annotations</artifactId>
             <version>${swagger-annotations-version}</version>
         </dependency>
+        <!-- @Nullable annotation -->
+        <dependency>
+            <groupId>com.google.code.findbugs</groupId>
+            <artifactId>jsr305</artifactId>
+            <version>3.0.2</version>
+        </dependency>
         <dependency>
             <groupId>com.squareup.retrofit2</groupId>
             <artifactId>converter-gson</artifactId>
diff --git a/samples/client/petstore/java/retrofit2-play26/pom.xml b/samples/client/petstore/java/retrofit2-play26/pom.xml
index 4a764c94f8..d03f83d54f 100644
--- a/samples/client/petstore/java/retrofit2-play26/pom.xml
+++ b/samples/client/petstore/java/retrofit2-play26/pom.xml
@@ -191,6 +191,12 @@
             <artifactId>swagger-annotations</artifactId>
             <version>${swagger-annotations-version}</version>
         </dependency>
+        <!-- @Nullable annotation -->
+        <dependency>
+            <groupId>com.google.code.findbugs</groupId>
+            <artifactId>jsr305</artifactId>
+            <version>3.0.2</version>
+        </dependency>
         <dependency>
             <groupId>com.squareup.retrofit2</groupId>
             <artifactId>converter-gson</artifactId>
diff --git a/samples/client/petstore/java/webclient/pom.xml b/samples/client/petstore/java/webclient/pom.xml
index 262a5b0b5c..ee6480dc26 100644
--- a/samples/client/petstore/java/webclient/pom.xml
+++ b/samples/client/petstore/java/webclient/pom.xml
@@ -65,6 +65,13 @@
             <artifactId>swagger-annotations</artifactId>
             <version>${swagger-annotations-version}</version>
         </dependency>
+        
+        <!-- @Nullable annotation -->
+        <dependency>
+            <groupId>com.google.code.findbugs</groupId>
+            <artifactId>jsr305</artifactId>
+            <version>3.0.2</version>
+        </dependency>
 
         <dependency>
             <groupId>io.projectreactor</groupId>