Issue 5413 - Use ConstructorBased Injection for ObjectMapper (#5430)

* Converting to constructor based injection

* Correcting spelling mistake

* Adding the bean for ObjectMapper

* Adding files modified by running the petstore scripts

* Adding final qualifier to objectMapper variable in apiController mustache

modules/swagger-codegen/src/main/resources/JavaSpring/apiController.mustache

@@ -32,6 +32,12 @@ import javax.validation.Valid;
 @Controller
 {{#operations}}
 public class {{classname}}Controller implements {{classname}} {
+    private final ObjectMapper objectMapper;
+
+    public {{classname}}Controller(ObjectMapper objectMapper) {
+        this.objectMapper = objectMapper;
+    }
+
 {{#isDelegate}}
     private final {{classname}}Delegate delegate;
 
@@ -49,11 +55,7 @@ public class {{classname}}Controller implements {{classname}} {
         {{^isDelegate}}
         {{^async}}
         {{#examples}}
-        {{#-first}}
-        
-        ObjectMapper objectMapper = new ObjectMapper();
 
-        {{/-first}}
         if (accept != null && accept.contains("{{{contentType}}}")) {
             return new ResponseEntity<{{>returnTypes}}>(objectMapper.readValue("{{#lambdaRemoveLineBreak}}{{#lambdaEscapeDoubleQuote}}{{{example}}}{{/lambdaEscapeDoubleQuote}}{{/lambdaRemoveLineBreak}}", {{>exampleReturnTypes}}.class), HttpStatus.OK);
         }

modules/swagger-codegen/src/main/resources/JavaSpring/libraries/spring-mvc/swaggerUiConfiguration.mustache

@@ -6,6 +6,7 @@ import org.springframework.context.annotation.ComponentScan;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.PropertySource;
 import org.springframework.context.annotation.Import;
+import org.springframework.context.annotation.Bean;
 import org.springframework.http.converter.HttpMessageConverter;
 import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;
 import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
@@ -58,14 +59,23 @@ public class SwaggerUiConfiguration extends WebMvcConfigurerAdapter {
     }
   }
 
+  @Bean
+  public Jackson2ObjectMapperBuilder builder() {
+    Jackson2ObjectMapperBuilder builder = new Jackson2ObjectMapperBuilder()
+        .indentOutput(true)
+        .featuresToDisable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS)
+        .dateFormat(new RFC3339DateFormat());
+    return builder;
+  }
+
   @Override
   public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
-    ObjectMapper objectMapper = Jackson2ObjectMapperBuilder.json()
-        .featuresToDisable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS)
-        .dateFormat( new RFC3339DateFormat())
-        .build();
-    converters.add(new MappingJackson2HttpMessageConverter(objectMapper));
+    converters.add(new MappingJackson2HttpMessageConverter(objectMapper()));
     super.configureMessageConverters(converters);
   }
 
+  @Bean
+  public ObjectMapper objectMapper(){
+    return builder().build();
+  }
 }