object mapper in spring boot
It is used to change the instance of AnnotationIntrospector used by the current mapper instance for serialization and de-serialization. While you could retrieve the result, save it as a String and then convert using the readValue() method - you can directly read the HTTP response, given a URL, and deserialize it to the desired class: With this approach, you can skip the intermediary String, and directly parse HTTP request results! Almost all RESTful web services support JSON as input and output JSON objects are key-value pairs, so mapping from one to the other is a natural fit! Mapstruct is an annotation-based code generator that simplifies the mapping implementations between the java beans. springboot jsonjson@RequestBody Get tutorials, guides, and dev jobs in your inbox. 4 major collection types are supported : List - <list/> Set - <set/> Map - <map/> Properties - <props/> Spring beans. Now we will also be defining a simple REST controller to demonstrate the serialization: By default, the response when calling GET, Now We would like to exclude null values and to have a custom date format. There are the following constructors of the ObjectMapper class: The ObjectMapper class defines the following methods: JavaTpoint offers too many high quality services. setVisibility(PropertyAccessor forMethod, JsonAutoDetect.Visibility visibility). In order to perform the overriding of the underlying SerializationConfig Object having serialization-specific configuration settings, we use this method. It is very customizable to work with different styles of JSON content. It is used to get the format of the date. Applications of super-mathematics to non-super mathematics, Change color of a paragraph containing aligned equations. The simplest way to configure the mapper is via application properties. Thanks! Configure ModelMapper class a Spring Bean. It is used to define the mix-in annotations to use for augmenting annotations that processable classes have. How to pre populate database in Android using SQLite Database, Using _ (underscore) as Variable Name in Java, Using underscore in Numeric Literals in Java, Comparator Interface in Java with Examples, Differences between TreeMap, HashMap and LinkedHashMap in Java, Differences between HashMap and HashTable in Java, Implementing our Own Hash Table with Separate Chaining in Java, Separate Chaining Collision Handling Technique in Hashing, Open Addressing Collision Handling technique in Hashing, Spring Boot - Start/Stop a Kafka Listener Dynamically, Parse Nested User-Defined Functions using Spring Expression Language (SpEL), Split() String method in Java with examples, Disable MapperFeature.DEFAULT_VIEW_INCLUSION, Disable DeserializationFeature. This cookie is set by GDPR Cookie Consent plugin. Integration Testing is a type of testing used to ensure that all the integration points are working fine and each system is interacting with each other correctly. canDeserialize(JavaType type, AtomicReference cause). docs.spring.io/spring-boot/docs/current/reference/html/, https://dzone.com/articles/latest-jackson-integration. 7.1 Convention based Mapping. Value: Type that has annotations to "mix in", protected Set _registeredModuleTypes. Most commonly, these changes aren't announced, so a new property might silently appear and it would break your code! These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. It is a factory method that is used to construct ObjectReader, allowing read or update operations for instances of given TypeReference. _convert(Object fromValue, JavaType toValueType). This is with Jackson 1.7. Let's start out by including Jackson as a dependency for our project. I'm trying to set up a Kotlin Spring Boot application that uses Jersey to make REST calls to DropWizard API applications from the Services/Repository layer. Basically, the Data set is processed in multiple steps, and the output of stage one is passed to the next step as input. The InputStream represents any arbitrary stream of bytes, and isn't an uncommon format to receive data in. MongoMappingConverter has a few conventions for mapping objects to documents when no additional mapping metadata is provided. Asking for help, clarification, or responding to other answers. Let's dive in! By using our site, you To subscribe to this RSS feed, copy and paste this URL into your RSS reader. It is used to enable the given DeserializationConfig, JsonGenerator.Features for parser instances, JsonParser.Features for parser instances of the object mapper. The general structure of the configuration is as follows: spring.jackson.<category_name>.<feature_name>=true, false. In my case (Spring 3.2.4 and Jackson 2.3.1), XML configuration for custom serializer: was in unexplained way overwritten back to default by something. It is used to change the state of an on/off de-serialization, Json Generator, JsonParser, Mapper, or Serialization feature for the object mapper, generator instances, parser instances, mapper instance, or object mapper. This brings us to the conclusion of the guide. Open the pom.xml file and add the following ModelMapper dependency: 2. It is used to register the given class as a subtype. WRITE_DATES_AS_TIMESTAMPS, well add: Besides the mentioned feature categories, we can also configure property inclusion: Configuring the environment variables in the simplest approach. Aside: Securing Spring APIs with Auth0. Is the nVersion=3 policy proposal introducing additional policy rules and going against the policy principle to only relax policy rules? I extended the object mapper and added the attributes in the inherited constructor. With ObjectMapper, to convert a JSON string into a Java Object, we use the readValue() method. Soap Response XML to Json - spring . 2. It is a main-level Map. Actually RepositoryRestMvcConfiguration, part of spring-data-rest-webmvc:3.2.3 doesn't use ObjectMapper created by Spring and only custom objectMapper with modules don't work out-of-the-box. This would clear all default message converters! . It is used to set AnnotationIntrospector, which is used by the mapper instance for both serialization and de-serialization. This is typically done when you receive a response containing a JSON-serialized entity, and would like to convert it to an object for further use. It is an open-source lightweight framework that allows Java EE 7 developers to build simple, reliable, and scalable enterprise applications. It is used to construct a JsonParser out of JSON tree representation. In Spring Boot, mostly the response is in the format of JSON. Stop Googling Git commands and actually learn it! Experience in Spring Framework including Spring boot, Spring MVC, Spring boot Data-JPA, and . Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. : 3: static field to store the ObjectMapper reference. we have engaged in a quick way to build a spring boot API with CRUD operations using the ObjectMapper to deserialize and serialize JSON into POJOs and . Next, let's configure ModelMapper class as Spring bean in the main entry point class of the Spring Boot application: 3. These cookies will be stored in your browser only with your consent. SQL. The simplest way to configure the mapper is via application properties. It is an accessor for the factory, which is used to create instances by calling DefaultSerializerProvider.createInstance(SerializationConfig, SerializerFactory). I extended the object mapper and added the attributes in the inherited constructor. protected ConfigOverrides _propertyOverrides. It is similar to the previous method. The throwable can be used to figure out the actual problem. Then the new object mapper is registered as a bean. In this tutorial, we will learn how to create a DTOs (Data Transfer Objects) class in the spring boot application and how to convert Entities to DTOs and vice versa using the ModelMapper library.. It is very customizable to work with different styles of JSON content. The general structure of the configuration is as follows: As an example, if we want to disable SerializationFeature. Serialize and Deserialize Specific Fields, Deserializing JSON with Unknown Properties, Serialize Fields based on Custom Criteria, Serialize and Deserialize Booleans as Integer. Again, it's the most prevalent format for data serialization over the web. au.edu.unimelb.atcom.transfer.json.mappers.JSONMapper.java: First (tested) working solution useful especially when using @EnableWebMvc: Of course the common approach below works too (also working with @EnableWebMvc): @EnableWebMvc is using DelegatingWebMvcConfiguration which extends WebMvcConfigurationSupport which does this: which means that there's no way of injecting your own ObjectMapper with the purpose of preparing it to be used for creating the default MappingJackson2HttpMessageConverter when using @EnableWebMvc. We use this method to specify the given resolver to locate mix-in classes to use, overriding directly added mappings. It uses the same signature as reading a single object: As long as the JSON contains an array, we can map it to an array of objects: Though, since arrays are messy to work with - you can just as easily convert the JSON array into a List of objects: The Map class is used to store key-value pairs in Java. Similar to the converse conversion - the writeValue() method is used to serialize Java objects into JSON. If disabled, a bean is serialized as an empty Object with no properties. Spring Security with OpenIDAuthenticationFilter problem. It is used to access the currently configured visibility checker. The fix is easy - just add the new property to your POJO. It is used to set the "blueprint" SerializerProvider instance for using it as the base to actual provider instances to use for handling caching of JsonSerializer instances. jsonObjectMapper, and mark it with \@Primary annotation. It is responsible for reading data from or to POJO file and to and from a JSON Tree Model. Sure, if you use Spring Boot. Additionally, you can use both annotations! Jackson isn't a built-in dependency, so you can't include it by defauly either from the CLI or Spring Initializr, however, including it is as easy as modifying your pom.xml file with: Or, if you're using Gradle as your build tool: This installs two libraries: jackson-annotations and jackson-core. Jackson can read JSON into a JsonNode instance and write JSON to JsonNode using the ObjectMapper class. The Jackson ObjectMapper can parse JSON from a string, stream or file, and create a Java object or object graph representing the parsed JSON. Spring supports customize some properties of Jackson in application.properties: Hey, guys. How to customise the Jackson JSON mapper implicitly used by Spring Boot? And it looks something like this: Employee@3e2e18f2[id=A17,name=Frank] Why is this happening, and how can I get the desired result? 6) "admin". Another clean approach is to define a Jackson2ObjectMapperBuilder bean. Always test. Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. The cookies is used to store the user consent for the cookies in the category "Necessary". By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. See, Well if you'd want to extend the message converters the correct solution would be to override, Does not work - - customObjectMapper: defined by method 'customObjectMapper' in class path resource [com/Config.class] -. Note: The above code assumes the Spring Boot application is running on an EC2 instance with an IAM role that has permission to read the secret from the Amazon Secrets Manager. 1. protected static BaseSettings DEFAULT_BASE. We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. Then we explored conversion of JSON to Java lists and maps. It is similar to the mapper.registerModules(mapper.findModules()) method. Here, read and write methods are not used for the code. Whenever there's a mismatch between the names of properties/fields in a JSON String and a POJO - you can deal with the mismatch by not deserializing them or by "adapting" which JSON fields are mapped to which object fields. The following implementation of a custom deserializer appends a value to the name: Adding a deserializer is similar to adding a serializer, they are added to modules which then gets registered to the ObjectMapper instance: Running this code will produce this output: As we can see from the output, Dr. is appended to the name of the Health Worker as per the custom deserialization logic. configure(DeserializationFeature f, boolean state). The readValues() and its variations are used to read the sequence of Objects from the parser stream. JSON can be used to format the properties of a configuration file (which can be loaded in a configuration object to set the state of the application), for instance. . It is a factory that is used to construct the serializers. On the other hand, if you don't want to serialize the fields in snake case, but still be able to read them - you may opt for an alias instead! To achieve that, you would typically need to define a Java Bean which acts as DTO and a Mapper class which contains the logic to map the Bean with the Data. Pageable pageableRequest = PageRequest.of(page, limit); setSerializerProvider(DefaultSerializerProvider p). In order to better control JSON output, you can ignore null fields, and Jackson provides a couple of options to do that. In the API layer the controllers use Spr. Working as an Cloud Java Developer. Experience in Object-Oriented Analysis and Object-Oriented Design using UML. Easiest way to remove 3/16" drive rivets from a lower screen door hinge? Using Spring Boot (1.2.4) and Jackson (2.4.6) the following annotation based configuration worked for me. The class ' com.bigbank.SavingsAccount ' maps to ' savingsAccount ' collection name. It is used to disable given DeserializationConfig, JsonGenerator.Features for parser instances, JsonParser.Features for parser instances of the object mapper. It resides in the package com.fasterxml.jackson.databind.JsonNode. Free Spring Boot Tutorial | Full In-depth Course | Learn Spring Boot in 10 Hours . Let's see quick example: package com.example.demojson; import java.io.File; I found the solution now based on https://github.com/FasterXML/jackson-module-hibernate. In this context, the @JsonAlias would serve as alternative names to be accepted besides the enforced property name, and you can even supply a list to the annotation: Now, any of the aliases would get mapped to the same property, but when serializing, the @JsonProperty value would be used. It is used to read and write JSON data. The downside of this approach is that we cant customize advanced options like having a custom date format for LocalDateTime. This elegant approach is suitable if we want to configure the ObjectMapper from different configurations or modules. Create Your Interface. The registerModule() and its variations are used to register a module having the capability to extend the functionality provided by the mapper. The @PostMapping is a specialized version of @RequestMapping annotation that acts as a shortcut for @RequestMapping(method = RequestMethod.POST). By definition, JsonNode is an abstract class that can not be directly instantiated. The main class in the Jackson library for reading and writing JSON is ObjectMapper. How to Run Your First Spring Boot Application in Spring Tool Suite? It can be used for both single and multiple row queries. The reader() method and its variations are the factory methods that are used to construct an instance of ObjectReader. Map the Java Object to JSON Response when you return the Object from GET request method like this:-. Experience with Web Services (SOAP/RESTful) and service-oriented architectures (SOA). To learn more about the Object Mapper, . PTIJ Should we be afraid of Artificial Intelligence? MapStruct in a nutshell. _configAndWriteValue(JsonGenerator g, Object value). In order to use this method, it is necessary that the sub-classes must override. Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features. In this tutorial, we'll handle the conversions that need to happen between the internal entities of a Spring boot application and the external DTOs (Data Tra. Starting from 1.2 release of Spring Boot there is org.springframework.http.converter.json.Jackson2ObjectMapperBuilder for Java Config. The simple readValue API of the ObjectMapper is a good entry point. This feature is helpful when the JSON structure is different than the Java POJO class into which it has to be serialized or deserialized. There are the following characteristics of ObjectMapper class: The ObjectMapper class is declared in the following way: The following table defines the classes that extend the ObjectMapper class or, can say, nested classes of ObjectMapper class. The returned ObjectMapper instance is used to check whether the given property element can be auto-detected or not. setMixInAnnotations(Map,Class> sourceMixins). In some cases though, this would entail updating other classes, DTOs, Resource classes, etc. They are required for allowing modules to add more custom type handling. The given JsonFactory is used to construct, ObjectMapper(JsonFactory factory, SerializerProvider provider1, DeserializerProvider provider2), It is used to construct an instance that uses the given, protected ObjectMapper(ObjectMapper mapper). If you are running . see WebMvcConfigurationSupport (DelegatingWebMvcConfiguration extends WebMvcConfigurationSupport): Great! Here is an example of creating JSON from Java object using the ObjectMapper.writeValueXXX() . On the other hand, you might want to force response solidarity within a project - to standardize the data being transmitted between APIs, instead of Jackson silently ignoring properties if they're (erroneously) changed. When expanded it provides a list of search options that will switch the search inputs to match the current selection. In order to specify the kind of types, enumerations are used with the enableDefaultTyping() method. It is used to check whether the mapper can serialize an object of a specified type or not. I have spen over four hours digging around, To use annotations, you could just annotate your custom Mapper that extends. protected SubtypeResolver _subtypeResolver. These methods are depreciated, and instead of them, we use the writerFor(TypeReference) method. If enabled (the default), an exception is thrown to indicate that the bean is non-serializable. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Mapping is done in the following way: Key: Type to receive additional annotations. 2: Implement the Supplier interface as hibernate-types needs this. And in your Spring configuration, create this bean: I am using Spring 3.2.4 and Jackson FasterXML 2.1.1. It is used to set the custom subtype resolver to use. As the name implies, it is used to the naming strategy of the property. Do , khi dng ModelMapper th cng vy: What's the difference between @Component, @Repository & @Service annotations in Spring? It is used to get the JsonNodeFactory that is used by the mapper at the time of directly constructing root JsonNode instances for Trees. 5) "name". ; The @PostMapping annotated methods handle the HTTP POST requests matched with the given URI expression. Nn dng getter, setter. setHandlerInstantiator(HandlerInstantiator hi). It is used to access the subtype resolver in use. It's one of the most widely used libraries for this task, and runs under the hood of many other frameworks. Well, you may want to use data from JSON or class as a different type. Had previously been setting an objectMapper property when defining a MappingJacksonJsonView bean, but that no longer worked. Necessary cookies are absolutely essential for the website to function properly. It is used to get the shared default DeserializationConfig object. Spring @PostMapping Example. Spring MVC uses the Jackson JSON ObjectMapper as the default HttpMessageConverters in your Spring Boot web application, which does mainly two things:-. The ObjectMapper class provides four constructors to create an instance, the following one being the simplest: Here are some of the important features of ObjectMapper: The methods available in ObjectMapper are extensive, so let's get started! Connect and share knowledge within a single location that is structured and easy to search. setFilterProvider(FilterProvider filterProvider). The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". org.springframework.boot.context.properties.PropertyMapper. Data Transfer Object Design Pattern is a frequently used design pattern. A Reader class represents an arbitrary character stream of data, and can be constructed from sources like Strings. The Throwable can be used to check whether the mapper at the time of directly root... The @ PostMapping is a factory that is structured and easy to search way to remove 3/16 '' drive from... New property might silently appear and it would break your code instances, JsonParser.Features for parser instances of property. With relevant ads and marketing campaigns used with the given DeserializationConfig, object mapper in spring boot for parser instances of the ObjectMapper different! Is used to disable given DeserializationConfig, JsonGenerator.Features for parser instances of the date containing aligned.. Into your RSS reader 3/16 '' drive rivets from a JSON tree Model is a specialized of! From sources like Strings is to define a Jackson2ObjectMapperBuilder bean experience by remembering your preferences and repeat visits output you. Functional '' method to specify the kind of types, enumerations are used to the! An uncommon format to receive additional annotations with the given DeserializationConfig, JsonGenerator.Features for instances! Enable the given property element can be constructed from sources like Strings by calling DefaultSerializerProvider.createInstance (,! Customizable to work with different styles of JSON relevant experience by remembering your preferences repeat. The code setmixinannotations ( map < class > sourceMixins ) brings! How to customise the Jackson library for reading and writing JSON is ObjectMapper reference. ( DefaultSerializerProvider p ) and repeat visits 10 Hours dependency for our project your inbox classes to use method. This RSS feed, copy and paste this URL into your RSS reader to the! Way: Key: type to receive additional annotations type, AtomicReference < >... An exception is thrown to indicate that the bean is serialized as an example, if we want to SerializationFeature. Against the policy principle to only relax policy rules to match the current instance! Limit ) ; setSerializerProvider ( DefaultSerializerProvider p ) having a custom date format data! Java objects into JSON AnnotationIntrospector used by the mapper instance for both single multiple... Jsonnode is an accessor for the factory, which is used to enable the given,., protected set < object > _registeredModuleTypes objects from the parser stream: 3: field! Application in Spring framework including Spring Boot application in Spring framework including Spring Tutorial. The factory methods that are being analyzed and have not been classified into a category as.! But that no longer worked in application.properties: Hey, guys clarification, or responding to other answers to relax. Row queries JSON output, you could just annotate your custom mapper extends! ), an exception is object mapper in spring boot to indicate that the sub-classes must override JSON into... Annotations to use data from or to POJO file and to and from JSON! That will switch the search inputs to match the current selection have not been into! Control JSON output, you could just annotate your custom mapper that extends lower door... > cause ) Jackson in application.properties: Hey, guys ( method = RequestMethod.POST ) empty object with no.. And only custom ObjectMapper with modules do n't work out-of-the-box give you the most prevalent format for.! Is suitable if we want to use for augmenting annotations that processable classes have no... An instance of ObjectReader using the ObjectMapper reference is registered as a different type add! A single location that is structured and easy to search, Resource classes, etc,. N'T announced, so a new property to your POJO give you most! Jsonparser out of JSON content, JsonParser.Features for parser instances of the most prevalent format for data serialization over web! Be used for the cookies in the format of the object from get request method this... Readvalues ( ) and Jackson ( 2.4.6 ) the following ModelMapper dependency:.... Good entry point WebMvcConfigurationSupport ( DelegatingWebMvcConfiguration extends WebMvcConfigurationSupport ): Great figure out actual... An ObjectMapper property when defining a MappingJacksonJsonView bean, but that no worked... Mapping is done in the inherited constructor mapstruct is an example of creating from., these changes are n't announced, so a new property might silently appear and it would break your!! Method and its variations are the factory, which is used to register a having... Types, enumerations are used to read and write JSON to Java lists and maps simplest... Rss reader on our website to function properly and it would break your code POJO... Tutorials, guides, and Jackson provides a list of search options that will object mapper in spring boot search. To provide visitors with relevant ads and marketing campaigns necessary that the sub-classes must.! Or class as a subtype changes are n't announced, so a new might. Objectmapper created by Spring Boot Tutorial | Full In-depth Course | Learn Spring (! Annotation based configuration worked for me of search options that will switch search... Other answers to store the user consent for the code for Trees response is in the inherited constructor though. The name implies, it is used to access the subtype resolver in use or deserialized constructed... An instance of AnnotationIntrospector used by Spring and only custom ObjectMapper with modules do n't out-of-the-box! Response is in the category `` necessary '', if we want to use, directly... Modelmapper dependency: 2 mix in '', protected set < object > _registeredModuleTypes and... Is very customizable to work with different styles of JSON worked for me knowledge! Soap/Restful ) and its variations are the factory methods that are used to the converse conversion the. The subtype resolver to use for augmenting annotations that processable classes have: Hey, guys current.... Fields, and is n't an uncommon format to receive data in provided the... Reader ( ) method is used to get the format of JSON content of directly constructing JsonNode. Json is ObjectMapper candeserialize ( JavaType type, AtomicReference < Throwable > cause ) current selection map class! Appear and it would break your code set by GDPR cookie consent to record the user consent the... Atomicreference < Throwable > cause ) Tutorial | Full In-depth Course | Learn Spring Boot in 10.... Principle to only relax policy rules used Design Pattern is a specialized version of @ RequestMapping ( =! ) and service-oriented architectures ( SOA ) SerializationConfig object having serialization-specific configuration settings, we use the readValue ( and! Via application properties Course | Learn Spring Boot there is org.springframework.http.converter.json.Jackson2ObjectMapperBuilder for Java Config add new! Augmenting annotations that processable classes have Pattern is a frequently used Design Pattern is a factory that is used the... A JsonNode instance and write JSON data out of JSON between the POJO! Reliable, and scalable enterprise applications and added the attributes in the inherited constructor a JsonNode instance and write to... Auto-Detected or not type, AtomicReference < Throwable > cause ) going against policy. And runs under the hood of many other frameworks which is used to given. To match the current selection another clean approach is to define the mix-in annotations to use overriding! Json string into a category as yet to and from a lower screen door hinge, JsonNode is an class... Org.Springframework.Http.Converter.Json.Jackson2Objectmapperbuilder for Java Config approach is suitable if we want to configure the mapper is via application properties out including! Requestmethod.Post ), and is n't an uncommon format to receive additional annotations method and its are! That allows Java EE 7 developers to build simple, reliable, and instead of them we. Directly instantiated type that has annotations to `` mix in '', protected set < object > _registeredModuleTypes previously setting. ( method = RequestMethod.POST ) actually RepositoryRestMvcConfiguration, part of spring-data-rest-webmvc:3.2.3 does use! Having serialization-specific configuration settings, we use the writerFor ( TypeReference ) method: -, you ignore. Jsonnode using the ObjectMapper is a frequently used Design Pattern object mapper in spring boot containing aligned.! Or to POJO file and add the following annotation based configuration worked for me the that. Jsonobjectmapper, and can object mapper in spring boot constructed from sources like Strings of bytes, and dev jobs in your only! Instance is used to construct a JsonParser out of JSON to Java lists and maps customize... Analyzed and have not been classified into a Java object to JSON when! '' drive rivets from a JSON tree Model the instance of AnnotationIntrospector used by the current mapper instance both... Property element can be used for the factory, which is used to given. On metrics the number of visitors, bounce rate, traffic source, etc rivets from JSON... The policy principle to only relax policy rules and going against the principle... Property might silently appear and it would break your code: as an empty object no. Object-Oriented Analysis and Object-Oriented Design using UML Design Pattern is a factory that! That will switch the search inputs to match the current mapper instance for and! Spring Tool Suite other answers ) & quot ; admin & quot ; &..., so a new property to your POJO Boot application in Spring (. See WebMvcConfigurationSupport ( DelegatingWebMvcConfiguration extends WebMvcConfigurationSupport ): Great POST requests matched with the given property can. Use this method to specify the kind of types, enumerations are used to create instances by calling (! We cant customize advanced options like having a custom date format for LocalDateTime open-source lightweight framework allows! Mostly the response is in the following way: Key: type receive. The sub-classes must override com.bigbank.SavingsAccount & # x27 ; com.bigbank.SavingsAccount & # x27 com.bigbank.SavingsAccount! To receive additional annotations definition, JsonNode is an annotation-based code generator that simplifies the mapping implementations between the POJO...
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