Exclude the discriminator field from getting a nullable_var_annotations (OpenAPITools#21155)

* Exclude the discriminator field from getting a nullable_var_annotations

* Update samples

* Manually add annotations since the remote pipeline insists that they should be there

* Add description for why the discriminator does not have a nullability-annotation

* Update samples

Author: Mattias-Sehlstedt

modules/openapi-generator/src/main/resources/Java/pojo.mustache

@@ -67,7 +67,12 @@ public class {{classname}} {{#parent}}extends {{{.}}} {{/parent}}{{#vendorExtens
   {{#gson}}
   @SerializedName(SERIALIZED_NAME_{{nameInSnakeCase}})
   {{/gson}}
+  {{^isDiscriminator}}
   {{>nullable_var_annotations}}{{! prevent indent}}
+  {{/isDiscriminator}}
+  {{#isDiscriminator}}
+  // The discriminator does not have Nullability-annotation since it is added during serialization by the @JsonTypeName annotation
+  {{/isDiscriminator}}
   {{#vendorExtensions.x-field-extra-annotation}}
   {{{vendorExtensions.x-field-extra-annotation}}}
   {{/vendorExtensions.x-field-extra-annotation}}

samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/Animal.java

@@ -49,7 +49,7 @@
 
 public class Animal {
   public static final String JSON_PROPERTY_CLASS_NAME = "className";
-  @javax.annotation.Nonnull
+  // The discriminator does not have Nullability-annotation since it is added during serialization by the @JsonTypeName annotation
   protected String className;
 
   public static final String JSON_PROPERTY_COLOR = "color";

samples/client/petstore/java/apache-httpclient/src/main/java/org/openapitools/client/model/ParentWithNullable.java

@@ -85,7 +85,7 @@ public static TypeEnum fromValue(String value) {
   }
 
   public static final String JSON_PROPERTY_TYPE = "type";
-  @javax.annotation.Nullable
+  // The discriminator does not have Nullability-annotation since it is added during serialization by the @JsonTypeName annotation
   protected TypeEnum type;
 
   public static final String JSON_PROPERTY_NULLABLE_PROPERTY = "nullableProperty";

samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/Animal.java

@@ -47,7 +47,7 @@
 
 public class Animal {
   public static final String JSON_PROPERTY_CLASS_NAME = "className";
-  @javax.annotation.Nonnull
+  // The discriminator does not have Nullability-annotation since it is added during serialization by the @JsonTypeName annotation
   protected String className;
 
   public static final String JSON_PROPERTY_COLOR = "color";

samples/client/petstore/java/rest-assured-jackson/src/main/java/org/openapitools/client/model/Animal.java

@@ -50,7 +50,7 @@
 
 public class Animal {
   public static final String JSON_PROPERTY_CLASS_NAME = "className";
-  @javax.annotation.Nonnull
+  // The discriminator does not have Nullability-annotation since it is added during serialization by the @JsonTypeName annotation
   protected String className;
 
   public static final String JSON_PROPERTY_COLOR = "color";

samples/client/petstore/java/rest-assured/src/main/java/org/openapitools/client/model/Animal.java

@@ -32,7 +32,7 @@
 public class Animal {
   public static final String SERIALIZED_NAME_CLASS_NAME = "className";
   @SerializedName(SERIALIZED_NAME_CLASS_NAME)
-  @javax.annotation.Nonnull
+  // The discriminator does not have Nullability-annotation since it is added during serialization by the @JsonTypeName annotation
   protected String className;
 
   public static final String SERIALIZED_NAME_COLOR = "color";

samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/Animal.java

@@ -46,7 +46,7 @@
 
 public class Animal {
   public static final String JSON_PROPERTY_CLASS_NAME = "className";
-  @javax.annotation.Nonnull
+  // The discriminator does not have Nullability-annotation since it is added during serialization by the @JsonTypeName annotation
   protected String className;
 
   public static final String JSON_PROPERTY_COLOR = "color";

samples/client/petstore/java/resteasy/src/main/java/org/openapitools/client/model/ParentWithNullable.java

@@ -82,7 +82,7 @@ public static TypeEnum fromValue(String value) {
   }
 
   public static final String JSON_PROPERTY_TYPE = "type";
-  @javax.annotation.Nullable
+  // The discriminator does not have Nullability-annotation since it is added during serialization by the @JsonTypeName annotation
   protected TypeEnum type;
 
   public static final String JSON_PROPERTY_NULLABLE_PROPERTY = "nullableProperty";

samples/client/petstore/java/retrofit2-play26/src/main/java/org/openapitools/client/model/Animal.java

@@ -49,7 +49,7 @@
 
 public class Animal {
   public static final String JSON_PROPERTY_CLASS_NAME = "className";
-  @jakarta.annotation.Nonnull
+  // The discriminator does not have Nullability-annotation since it is added during serialization by the @JsonTypeName annotation
   protected String className;
 
   public static final String JSON_PROPERTY_COLOR = "color";

samples/client/petstore/java/retrofit2/src/main/java/org/openapitools/client/model/Animal.java

@@ -29,7 +29,7 @@
 public class Animal {
   public static final String SERIALIZED_NAME_CLASS_NAME = "className";
   @SerializedName(SERIALIZED_NAME_CLASS_NAME)
-  @javax.annotation.Nonnull
+  // The discriminator does not have Nullability-annotation since it is added during serialization by the @JsonTypeName annotation
   protected String className;
 
   public static final String SERIALIZED_NAME_COLOR = "color";