java - jar 文件错误 : Could not find or load main class while executing a .

Question

我使用 Intellij 创建了一个 Dropwizard 应用程序。 (这里com.indore.GalaxyApp是我的MainClass的名称)

这是pom.xml我的应用程序。

使用mvn clean package构建项目后，在我的target目录中创建了一个jar文件。

现在，我尝试通过终端运行包含 jar 文件的应用程序，我得到以下响应:

MANIFEST.MF

为了使jar可执行

1. 我已经配置了 Maven Archiver 并按照此 SO answer 在 pom.xml 中添加了以下插件

   

2. 我什至通过以下方式运行应用程序:

   java -cp target/galaxy-1.0-SNAPSHOT.jar com.indore.GalaxyApp

但仍然遇到同样的错误。

我引用了这些帖子:

setup-main-class-in-manifest , Cant execute jar file

谁能告诉我解决这个问题的方法吗？

Answer 1

我能够按照 documentation 解决此问题.

这里是示例pom.xml供引用

<?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.example</groupId>
<artifactId>example</artifactId>
<version>1.0-SNAPSHOT</version>

<properties>
    <maven.compiler.source>11</maven.compiler.source>
    <maven.compiler.target>11</maven.compiler.target>
</properties>

<dependencies>
    <!-- https://mvnrepository.com/artifact/io.dropwizard/dropwizard-core -->
    <dependency>
        <groupId>io.dropwizard</groupId>
        <artifactId>dropwizard-core</artifactId>
        <version>2.0.25</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/io.dropwizard/dropwizard-db -->
    <dependency>
        <groupId>io.dropwizard</groupId>
        <artifactId>dropwizard-db</artifactId>
        <version>2.0.25</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/io.dropwizard/dropwizard-hibernate -->
    <dependency>
        <groupId>io.dropwizard</groupId>
        <artifactId>dropwizard-hibernate</artifactId>
        <version>2.0.13</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.postgresql/postgresql -->
    <dependency>
        <groupId>org.postgresql</groupId>
        <artifactId>postgresql</artifactId>
        <version>42.3.1</version>
    </dependency>
</dependencies>
<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-jar-plugin</artifactId>
            <version>2.4</version>
            <configuration>
                <archive>
                    <manifest>
                        <addDefaultImplementationEntries>true</addDefaultImplementationEntries>
                    </manifest>
                </archive>
            </configuration>
        </plugin>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-shade-plugin</artifactId>
            <version>2.3</version>
            <configuration>
                <createDependencyReducedPom>true</createDependencyReducedPom>
                <filters>
                    <filter>
                        <artifact>*:*</artifact>
                        <excludes>
                            <exclude>META-INF/*.SF</exclude>
                            <exclude>META-INF/*.DSA</exclude>
                            <exclude>META-INF/*.RSA</exclude>
                        </excludes>
                    </filter>
                </filters>
            </configuration>
            <executions>
                <execution>
                    <phase>package</phase>
                    <goals>
                        <goal>shade</goal>
                    </goals>
                    <configuration>
                        <transformers>
                            <transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"/>
                            <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                                <mainClass>com.example.helloworld.HelloWorldApplication</mainClass>
                            </transformer>
                        </transformers>
                    </configuration>
                </execution>
            </executions>
        </plugin>
    </plugins>
</build>
</project>