I'm trying to create a JSON file and i'm having trouble while trying to use ObjectMapper class. heres my class code:
import java.math.BigDecimal;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import desafiodimensiva.entities.Desafio2;
@RestController
public class Desafio2Controller {
@RequestMapping(value = "/teste")
public String index() {
return "Greetings from Spring Boot!";
}
@RequestMapping("/desafio2")
public Desafio2 novoDesafio2() {
ObjectMapper mapper = new ObjectMapper();
Desafio2 pessoa = new Desafio2();
BigDecimal valorFinanceiroPessoa = new BigDecimal("0.00");
pessoa.setNomePessoa("----------- ");
pessoa.setIdPessoa("0000");
pessoa.setValorFinanceiro(valorFinanceiroPessoa);
return pessoa;
}
}
and there's my pom.xml :
`<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.desafio.dimensiva</groupId>
<artifactId>desafiodimensiva</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<name>Desafio Dimensiva</name>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.0.BUILD-SNAPSHOT</version>
</parent>
<properties>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.apache.tomcat</groupId>
<artifactId>tomcat</artifactId>
<version>8.5.0</version>
<type>pom</type>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>5.2.6.Final</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>5.2.6.Final</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.22</version>
</dependency>
<dependency>
<groupId>com.mchange</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.5-pre3</version>
</dependency>
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.4</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.9.0</version>
</dependency>
</dependencies>
<build>
<finalName>desafiodimensiva</finalName>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<executable>true</executable>
</configuration>
</plugin>
</plugins>
</build>
<repositories>
<repository>
<id>spring-snapshots</id>
<url>https://repo.spring.io/snapshot</url>
<snapshots>
<enabled>true</enabled>
</snapshots>
</repository>
<repository>
<id>spring-milestones</id>
<url>https://repo.spring.io/milestone</url>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>spring-snapshots</id>
<url>https://repo.spring.io/snapshot</url>
</pluginRepository>
<pluginRepository>
<id>spring-milestones</id>
<url>https://repo.spring.io/milestone</url>
</pluginRepository>
</pluginRepositories>
</project>`
I cannot import ObjectMapper class even with the jackson-databind
dependency added at the pom.xml
file. and the jars jackson-annotations-2.9.0.jar, jackson-core-2.9.5.jar, jackson-databind-2.9.0.jar
are at the classpath.
The Jackson ObjectMapper can parse JSON from a string, stream or file, and create a Java object or object graph representing the parsed JSON. Parsing JSON into Java objects is also referred to as to deserialize Java objects from JSON. The Jackson ObjectMapper can also create JSON from Java objects.
Mapper instances are fully thread-safe provided that ALL configuration of the instance occurs before ANY read or write calls.
Class JsonProcessingExceptionIntermediate base class for all problems encountered when processing (parsing, generating) JSON content that are not pure I/O problems. Regular IOException s will be passed through as is. Sub-class of IOException for convenience.
remove the version for jackson dependency jackson-databind
i.e. just write
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
</dependency>
in your pom.xml
. And let spring-boot decide the version for you.
Feel free to remove the jars from classpath.
Remove
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.9.0</version> <--- remove this
</dependency>
Also take a look into the effective pom by right clicking pom.xml if you are on intellij Maven > Show Effective POM . Check for conflicts there.
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
</dependency>
and then try
mvn dependency:purge-local-repository;
This will first resolve the entire dependency tree, then delete the contents from the local repository, and then re-resolve the dependencies from the remote repository.
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