diff --git a/modules/openapi-generator/src/main/resources/JavaSpring/pojo.mustache b/modules/openapi-generator/src/main/resources/JavaSpring/pojo.mustache
index 6305be42a15..e5f9c6136c5 100644
--- a/modules/openapi-generator/src/main/resources/JavaSpring/pojo.mustache
+++ b/modules/openapi-generator/src/main/resources/JavaSpring/pojo.mustache
@@ -146,6 +146,9 @@ public class {{classname}}{{#parent}} extends {{{parent}}}{{/parent}}{{^parent}}
   {{#useBeanValidation}}
   {{>beanValidation}}
   {{/useBeanValidation}}
+  {{^useBeanValidation}}
+  {{#required}}@NotNull{{/required}}
+  {{/useBeanValidation}}
   {{#swagger2AnnotationLibrary}}
   @Schema(name = "{{{baseName}}}", {{#isReadOnly}}accessMode = Schema.AccessMode.READ_ONLY, {{/isReadOnly}}{{#example}}example = "{{{.}}}", {{/example}}{{#description}}description = "{{{.}}}", {{/description}}required = {{{required}}})
   {{/swagger2AnnotationLibrary}}
diff --git a/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/spring/SpringCodegenTest.java b/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/spring/SpringCodegenTest.java
index a2d23d1e28e..ac1f12a3eb0 100644
--- a/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/spring/SpringCodegenTest.java
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/spring/SpringCodegenTest.java
@@ -38,8 +38,7 @@ import java.io.File;
 import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.Paths;
-import java.util.List;
-import java.util.Map;
+import java.util.*;
 import java.util.function.Consumer;
 import java.util.function.Function;
 import java.util.stream.Collectors;
@@ -1562,6 +1561,82 @@ public class SpringCodegenTest {
     }
 
     @Test
+    public void requiredFieldShouldIncludeNotNullAnnotation_issue13365() throws IOException {
+
+        SpringCodegen codegen = new SpringCodegen();
+        codegen.setLibrary(SPRING_BOOT);
+        codegen.additionalProperties().put(SpringCodegen.INTERFACE_ONLY, "true");
+        codegen.additionalProperties().put(SpringCodegen.USE_BEANVALIDATION, "false");
+        codegen.additionalProperties().put(SpringCodegen.PERFORM_BEANVALIDATION, "false");
+        codegen.additionalProperties().put(SpringCodegen.OPENAPI_NULLABLE, "false");
+        codegen.additionalProperties().put(SpringCodegen.UNHANDLED_EXCEPTION_HANDLING, "false");
+        codegen.additionalProperties().put(CodegenConstants.SORT_MODEL_PROPERTIES_BY_REQUIRED_FLAG, "false");
+        codegen.additionalProperties().put(CodegenConstants.SORT_PARAMS_BY_REQUIRED_FLAG, "false");
+        codegen.additionalProperties().put(CodegenConstants.SERIALIZATION_LIBRARY, "jackson");
+        codegen.additionalProperties().put(CodegenConstants.ENUM_PROPERTY_NAMING, "PascalCase");
+        codegen.additionalProperties().put(SpringCodegen.USE_TAGS, "true");
+
+        DefaultGenerator generator = new DefaultGenerator();
+        Map<String, File> files = generateFiles(codegen, "src/test/resources/bugs/issue_13365.yml");
+
+        //Assert that NotNull annotation exists alone with no other BeanValidation annotations
+        JavaFileAssert.assertThat(files.get("Person.java"))
+                .printFileContent().assertMethod("getName").assertMethodAnnotations()
+                .containsWithName("NotNull").anyMatch(annotation ->
+                        !annotation.getNameAsString().equals("Valid") ||
+                                !annotation.getNameAsString().equals("Pattern") ||
+                                !annotation.getNameAsString().equals("Email") ||
+                                !annotation.getNameAsString().equals("Size"));
+
+    }
+
+    @Test
+    public void nonRequiredFieldShouldNotIncludeNotNullAnnotation_issue13365() throws IOException {
+
+        SpringCodegen codegen = new SpringCodegen();
+        codegen.setLibrary(SPRING_BOOT);
+        codegen.additionalProperties().put(SpringCodegen.INTERFACE_ONLY, "true");
+        codegen.additionalProperties().put(SpringCodegen.USE_BEANVALIDATION, "false");
+        codegen.additionalProperties().put(SpringCodegen.PERFORM_BEANVALIDATION, "false");
+        codegen.additionalProperties().put(SpringCodegen.OPENAPI_NULLABLE, "false");
+        codegen.additionalProperties().put(SpringCodegen.UNHANDLED_EXCEPTION_HANDLING, "false");
+        codegen.additionalProperties().put(CodegenConstants.SORT_MODEL_PROPERTIES_BY_REQUIRED_FLAG, "false");
+        codegen.additionalProperties().put(CodegenConstants.SORT_PARAMS_BY_REQUIRED_FLAG, "false");
+        codegen.additionalProperties().put(CodegenConstants.SERIALIZATION_LIBRARY, "jackson");
+        codegen.additionalProperties().put(CodegenConstants.ENUM_PROPERTY_NAMING, "PascalCase");
+        codegen.additionalProperties().put(SpringCodegen.USE_TAGS, "true");
+
+        Map<String, File> files = generateFiles(codegen, "src/test/resources/bugs/issue_13365.yml");
+
+        JavaFileAssert.assertThat(files.get("Alien.java"))
+                .printFileContent().assertMethod("getName")
+                .assertMethodAnnotations().anyMatch(annotation -> !annotation.getNameAsString().equals("NotNull"));
+    }
+
+    @Test
+    public void requiredFieldShouldIncludeNotNullAnnotationWithBeanValidationTrue_issue13365() throws IOException {
+
+        SpringCodegen codegen = new SpringCodegen();
+        codegen.setLibrary(SPRING_BOOT);
+        codegen.additionalProperties().put(SpringCodegen.INTERFACE_ONLY, "true");
+        codegen.additionalProperties().put(SpringCodegen.USE_BEANVALIDATION, "true");
+        codegen.additionalProperties().put(SpringCodegen.PERFORM_BEANVALIDATION, "false");
+        codegen.additionalProperties().put(SpringCodegen.OPENAPI_NULLABLE, "false");
+        codegen.additionalProperties().put(SpringCodegen.UNHANDLED_EXCEPTION_HANDLING, "false");
+        codegen.additionalProperties().put(CodegenConstants.SORT_MODEL_PROPERTIES_BY_REQUIRED_FLAG, "false");
+        codegen.additionalProperties().put(CodegenConstants.SORT_PARAMS_BY_REQUIRED_FLAG, "false");
+        codegen.additionalProperties().put(CodegenConstants.SERIALIZATION_LIBRARY, "jackson");
+        codegen.additionalProperties().put(CodegenConstants.ENUM_PROPERTY_NAMING, "PascalCase");
+        codegen.additionalProperties().put(SpringCodegen.USE_TAGS, "true");
+
+        Map<String, File> files = generateFiles(codegen, "src/test/resources/bugs/issue_13365.yml");
+
+        JavaFileAssert.assertThat(files.get("Person.java"))
+                .printFileContent().assertMethod("getName").assertMethodAnnotations()
+                .containsWithName("NotNull").containsWithName("Size").containsWithName("Email");
+
+    }
+
     public void shouldUseEqualsNullableForArrayWhenSetInConfig_issue13385() throws IOException {
         File output = Files.createTempDirectory("test").toFile().getCanonicalFile();
         output.deleteOnExit();
diff --git a/modules/openapi-generator/src/test/resources/bugs/issue_13365.yml b/modules/openapi-generator/src/test/resources/bugs/issue_13365.yml
new file mode 100644
index 00000000000..020e1d8c998
--- /dev/null
+++ b/modules/openapi-generator/src/test/resources/bugs/issue_13365.yml
@@ -0,0 +1,40 @@
+openapi: 3.0.0
+info:
+  description: Specification to reproduce nullable issue with Array
+  title: Required Api
+paths:
+  '/person':
+    post:
+      summary: Inserts a person
+      operationId: postPerson
+      tags:
+        - person
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/Person'
+
+      responses: ...
+
+components:
+  schemas:
+    Person:
+      type: object
+      required:
+        - name
+      properties:
+        name:
+          type: string
+          maxLength: 50
+          format: email
+        id:
+          type: integer
+    Alien:
+      type: object
+      properties:
+        name:
+          type: string
+        id:
+          type: integer
\ No newline at end of file