Question

我收到了maven的以下错误：UPDATED

运行应用程序时出错（只需使用数据库设置启动代码）

线程“main”中的异常java.lang.NoClassDefFoundError：org / springframework / context / ApplicationContextInitializer

引起：java.lang.ClassNotFoundException：org.springframework.context.ApplicationContextInitializer

错误安装mvn

[ERROR] initializationError（com.example.polls.PollsApplicationTests）经过的时间：0.005 s＆lt;＆lt;＆lt;错误！ org.springframework.beans.BeanInstantiationException：无法实例化[org.springframework.boot.test.context.SpringBootContextLoader]：无法解析的类定义;嵌套异常是java.lang.NoClassDefFoundError：org / springframework / context / ApplicationContextException 引起：java.lang.NoClassDefFoundError：org / springframework / context / ApplicationContextException 引起：java.lang.ClassNotFoundException：org.springframework.context.ApplicationContextException

的pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<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.example</groupId>
    <artifactId>polls</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>polls</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.0.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!-- For Working with Json Web Tokens (JWT) -->
        <dependency>
            <groupId>io.jsonwebtoken</groupId>
            <artifactId>jjwt</artifactId>
            <version>0.9.0</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.7.5</version>
        </dependency>

        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-classic</artifactId>
            <version>1.1.8</version>
        </dependency>

        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-core</artifactId>
            <version>1.1.8</version>
        </dependency>

        <!-- For Java 8 Date/Time Support -->
        <dependency>
            <groupId>com.fasterxml.jackson.datatype</groupId>
            <artifactId>jackson-datatype-jsr310</artifactId>
        </dependency>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

唯一的启动代码

package com.example.polls;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class PollsApplication {

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

Answer 1

该错误是由于未拾取spring-boot-starter-parent引起的。尝试摆脱<relativePath/>，然后从Maven Central Repo中提取该版本。因此<parent>的定义应该是：

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.0.0.RELEASE</version>
</parent>

当我尝试不使用Spring Boot父级创建应用程序时遇到或遇到了类似的问题。另一则帖子（对不起，我不能相信）向我指出了此https://docs.spring.io/spring-boot/docs/current/reference/html/using-boot-build-systems.html#using-boot-maven-without-a-parent，它对我有所帮助，但是由于您要使用它，因此问题很简单，就是spring-boot-starter-parent未被使用

线程“main”中的异常java.lang.NoClassDefFoundError：在Intellij [Spring boot]中

1 个答案: