错误: JNI发生了错误- SpringBoot - java.lang.NoClassDefFoundError: org/modelmapper/ModelMapper

Question

我试图使用命令'java -jar XXXX.jar‘运行我的spring引导项目，但是得到了以下错误：

错误:发生了JNI错误，请检查您的安装，并再次尝试异常线程"main“java.lang.NoClassDefFoundError: org/modelmapper/ModelMapper at java.lang.Class.getDeclaredMethods0(原生方法) at java.lang.Class.getDeclaredMethods0 at java.lang.Class.privateGetMethodRecursive(Class.java:3048) at java.lang.Class.getMethod0(Class.java:3018) at java.lang.Class.getMethod(Class.java:1784) at sun.launcher.LauncherHelpersun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:526)的.validateMainClass(LauncherHelper.java:544)由: java.lang.ClassNotFoundException: org.modelmapper.ModelMapper at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) .

我使用modelmapper并以以下方式将其声明为bean：

@SpringBootApplication(exclude = {SecurityAutoConfiguration.class })
public class StartApplication {

    @Bean
    public ModelMapper modelMapper() {
        return new ModelMapper();
    }

    public static void main(String[] args) {
        SpringApplication.run(StartApplication.class, args);
    }
}

在pom中，我定义了以下成瘾：

<dependency>
    <groupId>org.modelmapper</groupId>
    <artifactId>modelmapper</artifactId>
    <version>2.0.0</version>
</dependency>

有什么问题吗？

Answer 1

我通过执行以下步骤解决了这个问题：

Step1:添加ModelMapper库依赖项；

<dependency>
    <groupId>org.modelmapper</groupId>
    <artifactId>modelmapper</artifactId>
    <version>2.4.3</version>
</dependency>

Step2:在Spring配置中定义ModelMapper bean：

import org.modelmapper.ModelMapper;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;

@SpringBootApplication
public class SpringBootAppDemo {

    public static void main(String[] args) {
        SpringApplication app = new SpringApplication(SpringBootAppDemo.class);
    }
    
    @Bean
    public ModelMapper modelMapper() {
        return new ModelMapper();
    }
}

Step3:注入和使用ModelMapper

实体类

@Entity
public class Student {
    private Long id;
    private String firstName;
    private String lastName;
    private int year;
}

DTO类

public class StudentDto {
    private String firstName;
    private String lastName;
    private int year;
}

示例

import org.modelmapper.ModelMapper;

@Autowired
private ModelMapper modelMapper;

Student student = new Student(...);
ModelMapper modelMapper = new ModelMapper();
StudentDto studentDto = modelMapper.map(student, StudentDto.class);

Step4:停止你的项目；

Step5:运行命令行mvn clean；

Step6:再次运行您的项目；

我希望这能帮上忙！！