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Merge pull request eugenp#8247 from catalin-burcea/BAEL-19675
[BAEL-19675] - Move articles out of jackson part 2
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‎jackson-2/README.md

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The "REST With Spring" Classes: http://bit.ly/restwithspring
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### Relevant Articles:
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- [Mapping Multiple JSON Fields to a Single Java Field](https://www.baeldung.com/json-multiple-fields-single-java-field)
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- [How to Process YAML with Jackson](https://www.baeldung.com/jackson-yaml)
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- [Working with Tree Model Nodes in Jackson](https://www.baeldung.com/jackson-json-node-tree-model)
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- [Converting JSON to CSV in Java](https://www.baeldung.com/java-converting-json-to-csv)
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- [Compare Two JSON Objects with Jackson](https://www.baeldung.com/jackson-compare-two-json-objects)
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- [Calling Default Serializer from Custom Serializer in Jackson](https://www.baeldung.com/jackson-call-default-serializer-from-custom-serializer)
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- More articles: [[<-- prev]](/../jackson)

‎jackson-2/pom.xml

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<dependencies>
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<!-- YAML -->
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<dependency>
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<groupId>com.fasterxml.jackson.dataformat</groupId>
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<artifactId>jackson-dataformat-yaml</artifactId>
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<version>${jackson.version}</version>
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</dependency>
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<!-- CSV -->
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<dependency>
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<groupId>com.fasterxml.jackson.dataformat</groupId>
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<artifactId>jackson-dataformat-csv</artifactId>
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<version>${jackson.version}</version>
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</dependency>
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<!-- Allow use of LocalDate -->
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<dependency>
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<groupId>com.fasterxml.jackson.datatype</groupId>

‎jackson-annotations/src/test/java/com/baeldung/jackson/ignore/JacksonSerializationIgnoreUnitTest.java

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import com.baeldung.jackson.ignore.dtos.MyDtoIgnoreField;
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import com.baeldung.jackson.ignore.dtos.MyDtoIgnoreFieldByName;
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import com.baeldung.jackson.ignore.dtos.MyDtoIgnoreNull;
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import com.baeldung.jackson.ignore.dtos.MyDtoNullKeySerializer;
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import com.fasterxml.jackson.annotation.JsonInclude.Include;
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import com.fasterxml.jackson.core.JsonGenerator;
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import com.fasterxml.jackson.core.JsonParseException;
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System.out.println(dtoAsString);
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}
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// map
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@Test
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public final void givenIgnoringMapNullValue_whenWritingMapObjectWithNullValue_thenIgnored() throws JsonProcessingException {
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final ObjectMapper mapper = new ObjectMapper();
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// mapper.configure(SerializationFeature.WRITE_NULL_MAP_VALUES, false);
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mapper.setSerializationInclusion(Include.NON_NULL);
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final MyDto dtoObject1 = new MyDto();
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final Map<String, MyDto> dtoMap = new HashMap<String, MyDto>();
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dtoMap.put("dtoObject1", dtoObject1);
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dtoMap.put("dtoObject2", null);
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final String dtoMapAsString = mapper.writeValueAsString(dtoMap);
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assertThat(dtoMapAsString, containsString("dtoObject1"));
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assertThat(dtoMapAsString, not(containsString("dtoObject2")));
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System.out.println(dtoMapAsString);
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}
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@Test
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public final void givenIgnoringMapValueObjectWithNullField_whenWritingMapValueObjectWithNullField_thenIgnored() throws JsonProcessingException {
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final ObjectMapper mapper = new ObjectMapper();
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mapper.setSerializationInclusion(Include.NON_NULL);
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final MyDto dtoObject = new MyDto();
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final Map<String, MyDto> dtoMap = new HashMap<String, MyDto>();
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dtoMap.put("dtoObject", dtoObject);
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final String dtoMapAsString = mapper.writeValueAsString(dtoMap);
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assertThat(dtoMapAsString, containsString("dtoObject"));
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assertThat(dtoMapAsString, not(containsString("stringValue")));
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System.out.println(dtoMapAsString);
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}
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@Test
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public final void givenAllowingMapObjectWithNullKey_whenWriting_thenCorrect() throws JsonProcessingException {
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final ObjectMapper mapper = new ObjectMapper();
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mapper.getSerializerProvider()
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.setNullKeySerializer(new MyDtoNullKeySerializer());
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final MyDto dtoObject1 = new MyDto();
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dtoObject1.setStringValue("dtoObjectString1");
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final MyDto dtoObject2 = new MyDto();
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dtoObject2.setStringValue("dtoObjectString2");
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final Map<String, MyDto> dtoMap = new HashMap<String, MyDto>();
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dtoMap.put(null, dtoObject1);
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dtoMap.put("obj2", dtoObject2);
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final String dtoMapAsString = mapper.writeValueAsString(dtoMap);
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System.out.println(dtoMapAsString);
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assertThat(dtoMapAsString, containsString("\"\""));
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assertThat(dtoMapAsString, containsString("dtoObjectString1"));
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assertThat(dtoMapAsString, containsString("obj2"));
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}
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@Test
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public final void givenAllowingMapObjectOneNullKey_whenWritingMapObjectWithTwoNullKeys_thenOverride() throws JsonProcessingException {
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final ObjectMapper mapper = new ObjectMapper();
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mapper.getSerializerProvider()
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.setNullKeySerializer(new MyDtoNullKeySerializer());
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final MyDto dtoObject1 = new MyDto();
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dtoObject1.setStringValue("dtoObject1String");
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final MyDto dtoObject2 = new MyDto();
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dtoObject2.setStringValue("dtoObject2String");
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final Map<String, MyDto> dtoMap = new HashMap<String, MyDto>();
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dtoMap.put(null, dtoObject1);
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dtoMap.put(null, dtoObject2);
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final String dtoMapAsString = mapper.writeValueAsString(dtoMap);
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assertThat(dtoMapAsString, not(containsString("dtoObject1String")));
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assertThat(dtoMapAsString, containsString("dtoObject2String"));
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System.out.println(dtoMapAsString);
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}
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}

‎jackson-conversions-2/README.md

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## Jackson Conversions
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This module contains articles about Jackson conversions.
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### Relevant Articles:
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- [Mapping a Dynamic JSON Object with Jackson](https://www.baeldung.com/jackson-mapping-dynamic-object)
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- [Jackson Unmarshalling JSON with Unknown Properties](https://www.baeldung.com/jackson-deserialize-json-unknown-properties)
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- [Ignore Null Fields with Jackson](https://www.baeldung.com/jackson-ignore-null-fields)
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- [Mapping Multiple JSON Fields to a Single Java Field](https://www.baeldung.com/json-multiple-fields-single-java-field)
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- [Convert XML to JSON Using Jackson](https://www.baeldung.com/jackson-convert-xml-json)
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- [Converting JSON to CSV in Java](https://www.baeldung.com/java-converting-json-to-csv)
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- [How to Process YAML with Jackson](https://www.baeldung.com/jackson-yaml)
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- [Jackson Streaming API](https://www.baeldung.com/jackson-streaming-api)
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- More articles: [[<-- prev]](../jackson-conversions)

‎jackson-conversions-2/pom.xml

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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<artifactId>jackson-conversions-2</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<name>jackson-conversions-2</name>
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<parent>
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<groupId>com.baeldung</groupId>
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<artifactId>parent-java</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<relativePath>../parent-java</relativePath>
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</parent>
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<dependencies>
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<dependency>
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<groupId>com.fasterxml.jackson.core</groupId>
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<artifactId>jackson-databind</artifactId>
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<version>${jackson.version}</version>
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</dependency>
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<!--jackson for xml -->
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<dependency>
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<groupId>com.fasterxml.jackson.dataformat</groupId>
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<artifactId>jackson-dataformat-xml</artifactId>
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<version>${jackson.version}</version>
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</dependency>
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<!-- YAML -->
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<dependency>
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<groupId>com.fasterxml.jackson.dataformat</groupId>
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<artifactId>jackson-dataformat-yaml</artifactId>
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<version>${jackson.version}</version>
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</dependency>
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<!-- Allow use of LocalDate -->
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<dependency>
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<groupId>com.fasterxml.jackson.datatype</groupId>
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<artifactId>jackson-datatype-jsr310</artifactId>
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<version>2.9.8</version>
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</dependency>
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<!-- CSV -->
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<dependency>
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<groupId>com.fasterxml.jackson.dataformat</groupId>
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<artifactId>jackson-dataformat-csv</artifactId>
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<version>${jackson.version}</version>
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</dependency>
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<dependency>
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<groupId>org.assertj</groupId>
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<artifactId>assertj-core</artifactId>
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<version>${assertj.version}</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<build>
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<finalName>jackson-conversions-2</finalName>
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<resources>
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<resource>
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<directory>src/main/resources</directory>
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<filtering>true</filtering>
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</resource>
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</resources>
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</build>
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<properties>
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<assertj.version>3.11.0</assertj.version>
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</properties>
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</project>

‎jackson-2/src/main/java/com/baeldung/jackson/csv/JsonCsvConverter.java renamed to ‎jackson-conversions-2/src/main/java/com/baeldung/jackson/csv/JsonCsvConverter.java

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import java.io.File;
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import java.io.IOException;
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import com.baeldung.jackson.entities.OrderLine;
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import com.baeldung.jackson.mixin.OrderLineForCsv;
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import com.fasterxml.jackson.databind.JsonNode;
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import com.fasterxml.jackson.databind.MappingIterator;
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import com.fasterxml.jackson.databind.ObjectMapper;

‎jackson-2/src/main/java/com/baeldung/jackson/entities/OrderLine.java renamed to ‎jackson-conversions-2/src/main/java/com/baeldung/jackson/csv/OrderLine.java

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package com.baeldung.jackson.entities;
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package com.baeldung.jackson.csv;
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import java.math.BigDecimal;
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‎jackson-2/src/main/java/com/baeldung/jackson/mixin/OrderLineForCsv.java renamed to ‎jackson-conversions-2/src/main/java/com/baeldung/jackson/csv/OrderLineForCsv.java

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package com.baeldung.jackson.mixin;
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package com.baeldung.jackson.csv;
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import java.math.BigDecimal;
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‎jackson/src/main/java/com/baeldung/jackson/deserialization/dynamicobject/Product.java renamed to ‎jackson-conversions-2/src/main/java/com/baeldung/jackson/dynamicobject/Product.java

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package com.baeldung.jackson.deserialization.dynamicobject;
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package com.baeldung.jackson.dynamicobject;
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import java.util.LinkedHashMap;
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import java.util.Map;

‎jackson/src/main/java/com/baeldung/jackson/deserialization/dynamicobject/ProductJsonNode.java renamed to ‎jackson-conversions-2/src/main/java/com/baeldung/jackson/dynamicobject/ProductJsonNode.java

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package com.baeldung.jackson.deserialization.dynamicobject;
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package com.baeldung.jackson.dynamicobject;
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import com.fasterxml.jackson.databind.JsonNode;
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