初次搭建spring boot maven项目报错之Unable to find main class-蒲公英云

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 04:32 425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>${project.build.directory}/endorsed</endorsed.dir>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <java.version>1.8</java.version>
    </properties>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.3.1.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <dependencies>
        <!--spring boot-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>javax</groupId>
            <artifactId>javaee-web-api</artifactId>
            <version>7.0</version>
            <scope>provided</scope>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.1</version>
                <configuration>
                    <source>1.7</source>
                    <target>1.7</target>
                    <compilerArguments>
                        <endorseddirs>${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) {
    }
}