Maven Build缺少主类[重复]

Question

我在创建带有依赖项的 jar 时遇到错误。运行 jar 时出现以下错误：

Error: Could not find or load main class com.faro.engine.MainAppLoader

这是我的 pom.xml 文件

<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>Faro</groupId>
<artifactId>Faro</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>Faro</name>
<url>http://maven.apache.org</url>

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <springfox-swagger.version>2.7.0</springfox-swagger.version>
</properties>

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.4.0.RELEASE</version>
    <relativePath /> <!-- lookup parent from repository -->
</parent>


<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-actuator</artifactId>
        <exclusions>
            <exclusion>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-logging</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-jersey</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
        <exclusions>
            <exclusion>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-logging</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
    <!-- https://mvnrepository.com/artifact/com.googlecode.json-simple/json-simple -->
    <dependency>
        <groupId>com.googlecode.json-simple</groupId>
        <artifactId>json-simple</artifactId>
        <version>1.1.1</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
    <!-- https://mvnrepository.com/artifact/commons-httpclient/commons-httpclient -->
    <dependency>
        <groupId>commons-httpclient</groupId>
        <artifactId>commons-httpclient</artifactId>
        <version>3.1</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/com.restfb/restfb -->
    <dependency>
        <groupId>com.restfb</groupId>
        <artifactId>restfb</artifactId>
        <version>2.0.0-rc.3</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/com.facebook.business.sdk/facebook-java-business-sdk -->
    <dependency>
        <groupId>com.facebook.business.sdk</groupId>
        <artifactId>facebook-java-business-sdk</artifactId>
        <version>3.0.0</version>
    </dependency>

    <!-- swagger -->
    <dependency>
        <groupId>io.springfox</groupId>
        <artifactId>springfox-swagger2</artifactId>
        <version>${springfox-swagger.version}</version>
    </dependency>

    <dependency>
        <groupId>io.springfox</groupId>
        <artifactId>springfox-swagger-ui</artifactId>
        <version>${springfox-swagger.version}</version>
    </dependency>


    <dependency>
        <groupId>com.google.api-client</groupId>
        <artifactId>google-api-client-gson</artifactId>
        <version>1.23.0</version>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-jdbc</artifactId>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.34</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
        <version>5.0.4.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>com.fasterxml.uuid</groupId>
        <artifactId>java-uuid-generator</artifactId>
        <version>3.1.5</version>
    </dependency>
    <dependency>
        <groupId>org.json</groupId>
        <artifactId>json</artifactId>
        <version>20150729</version>
    </dependency>
</dependencies>

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
            <configuration>
                <addClasspath>true</addClasspath>
                <mainClass>com.faro.engine.MainAppLoader</mainClass>
            </configuration>
            <executions>
                <execution>
                    <goals>
                        <goal>repackage</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>
        <plugin>
            <artifactId>maven-assembly-plugin</artifactId>
            <configuration>
                <archive>
                    <manifest>
                        <addClasspath>true</addClasspath>
                        <mainClass>com.faro.engine.MainAppLoader</mainClass>
                    </manifest>
                </archive>
                <descriptorRefs>
                    <descriptorRef>jar-with-dependencies</descriptorRef>
                </descriptorRefs>
            </configuration>
            <executions>
                <execution>
                    <id>assemble-all</id>
                    <phase>package</phase>
                    <goals>
                        <goal>single</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>
    </plugins>

</build>

我可以在 Eclipse 中运行它。但是当我生成 jar 时，我收到错误“找不到或加载主类 com.faro.engine.MainAppLoader” 这是我的 pom 文件。

有什么想法吗？

提前谢谢:)

Answer 1

你可以检查一些事情：

• MainAppLoader 是否在 com.faro.engine 包下？
• MainAppLoader 是否用@SpringBootApplication 注释？
• spring-boot-maven-plugin 已经将您的应用程序组装成一个带有依赖项的 jar。你真的需要maven-assembly-plugin吗？

作为健全性检查，您可以尝试将您的插件声明替换为。

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