java - 无法执行目标 org.springframework.boot :spring-boot-maven-plugin:2. 1.12.RELEASE:run (default-cli)

Question

...“在项目 Jwplusapp 上:运行时发生异常。null”

有谁知道为什么我无法通过 maven 选择“spring-boot:run”而不会出现该错误？我尝试重命名数据库文件并确保父版本正确。我试图检查 pom.xml 但我想我只是错过了它。任何有关此错误代码的帮助将不胜感激。是的，我看到了类似的帖子，但他们似乎没有为我解决问题。

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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.12.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.test</groupId>
    <artifactId>Jwplusapp</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>war</packaging>
    <name>Jwplusapp</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <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-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-tomcat</artifactId>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
        </dependency>

        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-jasper</artifactId>
            <scope>provided</scope>
        </dependency>

    </dependencies>

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

</project>

应用程序.属性

spring.jpa.hibernate.ddl-auto=update
spring.datasource.url=jdbc:mysql://localhost:3306/Jwplus
spring.datasource.username=root
spring.datasource.password=root

ApplicationConfig.java

package com.test.Jwplusapp;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
import org.springframework.web.servlet.view.JstlView;

@Configuration
@ComponentScan(basePackages = "com.test.Jwplusapp")
public class ApplicationConfig extends WebMvcConfigurationSupport {

    @Override
    protected void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("css/**", "images/**")
                .addResourceLocations("classpath:/static/css/", "classpath:/static/images/");
    }

    @Bean
    public InternalResourceViewResolver jspViewResolver(){
        InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();
        viewResolver.setPrefix("/WEB-INF/jsp/");
        viewResolver.setSuffix(".jsp");
        viewResolver.setViewClass(JstlView.class);
        return viewResolver;
    }
}

Answer 1

我尝试了你的 pom.xml，它对我有用。仅当您具有相同的端口(8080 或您在应用程序中使用的任何端口)已被占用时，它才会失败并出现相同的错误。

您能否检查一下您尝试运行的端口的可用性。(如果它被占用，请尝试在其他端口上运行或终止该端口)。

您还可以将完整的错误粘贴到堆栈跟踪中的“null”之后吗？

更新:

确保您的项目中有以下属性

spring.jpa.hibernate.ddl-auto=update
spring.datasource.url=jdbc:mysql://${MYSQL_HOST:localhost}:3306/db_examplele
spring.datasource.username=springuser
spring.datasource.password=ThePassword

如果您使用jpa，请尝试以下配置

@Configuration        
public class HibernateConfig {

@Bean
public HibernateJpaSessionFactoryBean sessionFactory(EntityManagerFactory emf) {
     HibernateJpaSessionFactoryBean factory = new HibernateJpaSessionFactoryBean();
     factory.setEntityManagerFactory(emf);
     return factory;

}
}