Maven没有“主要清单属性”错误

Question

这是我的POM文件

    <?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.codetriage.scraper</groupId>
    <artifactId>codetriagescraper</artifactId>
    <version>1.0-SNAPSHOT</version>
    <name>codetriagescraper</name>
    <!-- FIXME change it to the project's website -->
    <url>http://www.example.com</url>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.7</maven.compiler.source>
        <maven.compiler.target>1.7</maven.compiler.target>
    </properties>
    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.jsoup</groupId>
            <artifactId>jsoup</artifactId>
            <version>1.11.3</version>
        </dependency>
    </dependencies>
    <build>
        <pluginManagement>
            <plugins>
                <plugin>
                    <groupId>org.apache.Maven.plugins</groupId>
                    <artifactId>Maven-shade-plugin</artifactId>
                    <version>3.2.0</version>
                    <executions>
                        <execution>
                            <phase>package</phase>
                            <goals>
                                <goal>shade</goal>
                            </goals>
                            <configuration>
                                <transformers>
                                    <transformer
                implementation="org.apache.Maven.plugins.shade.resource.ManifestResourceTransformer">
                                        <mainClass>com.codetriage.scraper.App</mainClass>
                                    </transformer>
                                </transformers>
                            </configuration>
                        </execution>
                    </executions>
                </plugin>
                <plugin>
                    <artifactId>maven-resources-plugin</artifactId>
                    <version>3.0.2</version>
                </plugin>
                <plugin>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <version>3.8.0</version>
                </plugin>
                <plugin>
                    <artifactId>maven-surefire-plugin</artifactId>
                    <version>2.22.1</version>
                </plugin>
                <plugin>
                    <artifactId>maven-jar-plugin</artifactId>
                    <version>3.0.2</version>
                </plugin>
                <plugin>
                    <artifactId>maven-install-plugin</artifactId>
                    <version>2.5.2</version>
                </plugin>
                <plugin>
                    <artifactId>maven-deploy-plugin</artifactId>
                    <version>2.8.2</version>
                </plugin>
                <plugin>
                    <artifactId>maven-site-plugin</artifactId>
                    <version>3.7.1</version>
                </plugin>
                <plugin>
                    <artifactId>maven-project-info-reports-plugin</artifactId>
                    <version>3.0.0</version>
                </plugin>
            </plugins>
        </pluginManagement>
    </build>
</project>

Mvn程序包很好，但是当我尝试java -jar target/codetriagescraper-1.0-SNAPSHOT.jar时，它返回“在target / codetriagescraper-1.0-SNAPSHOT.jar中没有主清单属性”。我试图添加不同的插件以使jar可执行，但是它们都没有用。顺便说一下，当我打包项目控制台时，只显示了默认插件。

Answer 1

行家需要清单说你的主要班级。你可以检查一下https://www.mkyong.com/maven/how-to-create-a-jar-file-with-maven/

<!-- Make this jar executable -->
        <plugin>
                  <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-jar-plugin</artifactId>
            <configuration>
              <excludes>
                    <exclude>**/log4j.properties</exclude>
              </excludes>
              <archive>
                <manifest>
                <addClasspath>true</addClasspath>
                     <mainClass>com.mkyong.core.utils.App</mainClass>
                <classpathPrefix>dependency-jars/</classpathPrefix>
                </manifest>
              </archive>
            </configuration>
        </plugin>