[英]The import com.fasterxml.jackson.databind.ObjectMapper cannot be resolved
I'm trying to create a JSON file and i'm having trouble while trying to use ObjectMapper class. 我正在尝试创建一个JSON文件,我在尝试使用ObjectMapper类时遇到了麻烦。 heres my class code:
继承我的班级代码:
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 : 那是我的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. 即使在
pom.xml
文件中添加了jackson-databind
依赖项,我也无法导入ObjectMapper类。 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. jars
jackson-annotations-2.9.0.jar, jackson-core-2.9.5.jar, jackson-databind-2.9.0.jar
都在类路径中。
remove the version for jackson dependency jackson-databind
ie just write 删除jackson依赖
jackson-databind
的版本,即只写
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
</dependency>
in your pom.xml
. 在你的
pom.xml
。 And let spring-boot decide the version for you. 让spring-boot为您决定版本。
Feel free to remove the jars from classpath. 随意从类路径中删除jar。
Remove 去掉
<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 . 如果你在intellij Maven> Show Effective POM上,也可以通过右键单击pom.xml来查看有效的pom。 Check for conflicts there.
检查那里的冲突。
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
</dependency>
and then try 然后试试
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. 这将首先解析整个依赖关系树,然后从本地存储库中删除内容,然后从远程存储库重新解析依赖关系。
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