初次搭建spring boot maven项目报错之Unable to find main class

r囧r小猫 2021-09-14 04:32 255阅读 0赞

首次搭建spring boot 项目时pom.xml如下

<?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.mycompany</groupId>
        <artifactId>SpringBoot</artifactId>
        <version>1.0-SNAPSHOT</version>
        <packaging>war</packaging>
    
        <name>SpringBoot</name>
    
        <properties>
            <endorsed.dir>${project.build.directory}/endorsed</endorsed.dir>
            <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
            <java.version>1.8</java.version>
        </properties>
        
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>1.3.1.RELEASE</version>
            <relativePath/> 
        </parent>
        
        <dependencies>
            
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
            
            <dependency>
                <groupId>javax</groupId>
                <artifactId>javaee-web-api</artifactId>
                <version>7.0</version>
                <scope>provided</scope>
            </dependency>
        </dependencies>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <version>3.1</version>
                    <configuration>
                        <source>1.7</source>
                        <target>1.7</target>
                        <compilerArguments>
                            <endorseddirs>${endorsed.dir}</endorseddirs>
                        </compilerArguments>
                    </configuration>
                </plugin>
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-war-plugin</artifactId>
                    <version>2.3</version>
                    <configuration>
                        <failOnMissingWebXml>false</failOnMissingWebXml>
                    </configuration>
                </plugin>
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-dependency-plugin</artifactId>
                    <version>2.6</version>
                    <executions>
                        <execution>
                            <phase>validate</phase>
                            <goals>
                                <goal>copy</goal>
                            </goals>
                            <configuration>
                                <outputDirectory>${endorsed.dir}</outputDirectory>
                                <silent>true</silent>
                                <artifactItems>
                                    <artifactItem>
                                        <groupId>javax</groupId>
                                        <artifactId>javaee-endorsed-api</artifactId>
                                        <version>7.0</version>
                                        <type>jar</type>
                                    </artifactItem>
                                </artifactItems>
                            </configuration>
                        </execution>
                    </executions>
                </plugin>
            </plugins>
        </build>
    
    </project>

构建时报错信息如下

--- spring-boot-maven-plugin:1.3.1.RELEASE:repackage (default) @ SpringBoot ---
    ------------------------------------------------------------------------
    BUILD FAILURE
    ------------------------------------------------------------------------
    Total time: 5.188 s
    Finished at: 2017-09-05T11:25:05+08:00
    Final Memory: 23M/286M
    ------------------------------------------------------------------------
    Failed to execute goal org.springframework.boot:spring-boot-maven-plugin:1.3.1.RELEASE:repackage (default) on project SpringBoot: Execution default of goal org.springframework.boot:spring-boot-maven-plugin:1.3.1.RELEASE:repackage failed: Unable to find main class -> [Help 1]
    
    repackage failed: Unable to find main class -> [Help 1]
    
    To see the full stack trace of the errors, re-run Maven with the -e switch.Re-run Maven using the -X switch to enable full debug logging.

其中抓取重要信息

Failed to execute goal org.springframework.boot:spring-boot-maven-plugin:1.3.1.RELEASE:repackage (default) on project SpringBoot: Execution default of goal org.springframework.boot:spring-boot-maven-plugin:1.3.1.RELEASE:repackage failed: Unable to find main class -> [Help 1]

提取信息为：

repackage failed: Unable to find main class -> [Help 1]

原因找到了，是因为缺少主类，修饰一下就是没有spring boot java入口配置类

于是：新建java文件就可以了：

package com.mycompany.springboot;
    
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    
    /**
     * TODO(在这里用一句话描述这个类的作用) 
     * @ClassNmae：NewClass   
     * @author zlx-雄雄
     * @date    2017-9-5 11:29:44
     * 
     */
    @SpringBootApplication
    public class NewClass {
        public static void main(String[] args) {
            
        }
    }

我这里用的开发工具是Netbeans8.0.3，但是这个配置跟开发工具没有关系  
其他开发工具可以参考：http://blog.csdn.net/Evan\_Leung/article/details/52498301?locationNum=7&fps=1