Java 导入 com.fasterxml.jackson.databind.ObjectMapper 无法解析
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The import com.fasterxml.Hymanson.databind.ObjectMapper cannot be resolved
提问by Felipe Bedê
I'm trying to create a JSON file and i'm having trouble while trying to use ObjectMapper class. heres my class code:
我正在尝试创建一个 JSON 文件，但在尝试使用 ObjectMapper 类时遇到了问题。继承人我的班级代码：
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 :
还有我的 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.Hymanson.core</groupId>
<artifactId>Hymanson-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 Hymanson-databinddependency added at the pom.xmlfile. and the jars Hymanson-annotations-2.9.0.jar, Hymanson-core-2.9.5.jar, Hymanson-databind-2.9.0.jarare at the classpath.
即使Hymanson-databind在pom.xml文件中添加了依赖项，我也无法导入 ObjectMapper 类。罐子Hymanson-annotations-2.9.0.jar, Hymanson-core-2.9.5.jar, Hymanson-databind-2.9.0.jar在类路径中。
采纳答案by Vinay Prajapati
remove the version for Hymanson dependency Hymanson-databindi.e. just write
删除Hyman逊依赖的版本，Hymanson-databind即只写
<dependency>
<groupId>com.fasterxml.Hymanson.core</groupId>
<artifactId>Hymanson-databind</artifactId>
</dependency>
in your pom.xml. And let spring-boot decide the version for you.
在您的pom.xml. 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罐子。
回答by ahumblenerd
Remove
消除
<dependency>
<groupId>com.fasterxml.Hymanson.core</groupId>
<artifactId>Hymanson-databind</artifactId>
<version>2.9.0</version> <--- remove this
</dependency>
Also take a look into the effective pom by right clicking pom.xmlif you are on intellij Maven > Show Effective POM. Check for conflicts there.
如果您在 intellij Maven > Show Effective POM上，还可以通过右键单击 pom.xml 来查看有效的 pom 。检查那里的冲突。
<dependency>
<groupId>com.fasterxml.Hymanson.core</groupId>
<artifactId>Hymanson-databind</artifactId>
</dependency>
and then try
然后尝试
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项。
