refactor: Add JsonInclude(JsonInclude.Include.NON_NULL)

Author: caoccao

hivemq-edge-openapi/openapi/templates/Java/README.md

@@ -20,10 +20,15 @@ The discriminator name `type` conflicts with the JackSon `type`. This patch chan
 @JsonIgnoreProperties(
 -   value = "{{{discriminator.propertyBaseName}}}", // ignore manually set {{{discriminator.propertyBaseName}}}, it will be automatically generated by Jackson during serialization
 -   allowSetters = true // allows the {{{discriminator.propertyBaseName}}} to be set during deserialization
-  value = "json{{{discriminator.propertyBaseName}}}", // ignore manually set json{{{discriminator.propertyBaseName}}}, it will be automatically generated by Jackson during serialization
-  allowSetters = true // allows the json{{{discriminator.propertyBaseName}}} to be set during deserialization
++   value = "json{{{discriminator.propertyBaseName}}}", // ignore manually set json{{{discriminator.propertyBaseName}}}, it will be automatically generated by Jackson during serialization
++   allowSetters = true // allows the json{{{discriminator.propertyBaseName}}} to be set during deserialization
 )
 
 - @JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.PROPERTY, property = "{{{discriminator.propertyBaseName}}}", visible = true)
 + @JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.PROPERTY, property = "json{{{discriminator.propertyBaseName}}}", visible = true)
+
+{{#discriminator.mappedModels}}
+{{#-first}}
++ @com.fasterxml.jackson.annotation.JsonInclude(com.fasterxml.jackson.annotation.JsonInclude.Include.NON_NULL)
+@JsonSubTypes({
 ```

hivemq-edge-openapi/openapi/templates/Java/typeInfoAnnotation.mustache

@@ -8,6 +8,7 @@
 @JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.PROPERTY, property = "json{{{discriminator.propertyBaseName}}}", visible = true)
 {{#discriminator.mappedModels}}
 {{#-first}}
+@com.fasterxml.jackson.annotation.JsonInclude(com.fasterxml.jackson.annotation.JsonInclude.Include.NON_NULL)
 @JsonSubTypes({
 {{/-first}}
   @JsonSubTypes.Type(value = {{modelName}}.class, name = "{{^vendorExtensions.x-discriminator-value}}{{mappingName}}{{/vendorExtensions.x-discriminator-value}}{{#vendorExtensions.x-discriminator-value}}{{{vendorExtensions.x-discriminator-value}}}{{/vendorExtensions.x-discriminator-value}}"),
@@ -21,4 +22,4 @@
 {{/-first}}
   @JsonbSubtype(alias = "{{^vendorExtensions.x-discriminator-value}}{{mappingName}}{{/vendorExtensions.x-discriminator-value}}{{#vendorExtensions.x-discriminator-value}}{{{vendorExtensions.x-discriminator-value}}}{{/vendorExtensions.x-discriminator-value}}", type = {{modelName}}.class),
 {{#-last}}
-}{{/-last}}{{/discriminator.mappedModels}}){{/jsonbPolymorphism}}
+}{{/-last}}{{/discriminator.mappedModels}}){{/jsonbPolymorphism}}