Question

我想构建一个jar来包含3个程序集。目的是在shell中运行具有特定主类的jar。

java -jar Test-1.0-SNAPSHOT.jar FirstMain
java -jar Test-1.0-SNAPSHOT.jar SecondMain

但是，以下pom.xml配置会构建三个jar，即默认值 jar无法运行且出现错误＆＃34;无法加载Main-Class清单属性＆＃34;。如何修复此问题以使用单个jar文件运行所有三个main。

<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/4.0.0http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.my.test</groupId>
<artifactId>TheTest</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<name>Test</name>
<url>http://maven.apache.org</url>
<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.9</version>
        <scope>test</scope>
    </dependency>
</dependencies>
<build>
    <defaultGoal>compile</defaultGoal>
    <plugins>
        <plugin>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>2.3.2</version>
            <configuration>
                <source>1.6</source>
                <target>1.6</target>
            </configuration>
        </plugin>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-surefire-plugin</artifactId>
            <configuration>
                <testFailureIgnore>true</testFailureIgnore>
            </configuration>
        </plugin>
        <plugin>
            <artifactId>maven-assembly-plugin</artifactId>
            <version>2.4</version>
            <executions>
                <execution>
                    <id>build-firstmain</id>
                    <configuration>
                        <appendAssemblyId>false</appendAssemblyId>
                        <archive>
                            <manifest>
                                <mainClass>com.my.test.main.FirstMain</mainClass>
                            </manifest>
                        </archive>
                        <descriptorRefs>
                            <descriptorRef>jar-with-dependencies</descriptorRef>
                        </descriptorRefs>
                        <finalName>${project.artifactId}-FirstMain</finalName>
                    </configuration>
                    <phase>package</phase>
                    <goals>
                        <goal>single</goal>
                    </goals>
                </execution>
                <execution>
                    <id>build-secondmain</id>
                    <configuration>
                        <appendAssemblyId>false</appendAssemblyId>
                        <archive>
                            <manifest>
                                <mainClass>com.my.test.main.SecondMain</mainClass>
                            </manifest>
                        </archive>
                        <descriptorRefs>
                            <descriptorRef>jar-with-dependencies</descriptorRef>
                        </descriptorRefs>
                        <finalName>${project.artifactId}-SecondMain</finalName>
                    </configuration>
                    <phase>package</phase>
                    <goals>
                        <goal>single</goal>
                    </goals>
                </execution>
                <execution>
                    <id>build-appmain</id>
                    <configuration>
                        <appendAssemblyId>false</appendAssemblyId>
                        <archive>
                            <manifest>
                                <mainClass>com.my.test.main.ThirdMain</mainClass>
                            </manifest>
                        </archive>
                        <descriptorRefs>
                            <descriptorRef>jar-with-dependencies</descriptorRef>
                        </descriptorRefs>
                        <finalName>${project.artifactId}-ThirdMain</finalName>
                    </configuration>
                    <phase>package</phase>
                    <goals>
                        <goal>single</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-surefire-plugin</artifactId>
            <configuration>
                <testFailureIgnore>true</testFailureIgnore>
            </configuration>
        </plugin>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-resources-plugin</artifactId>
            <version>2.4</version>
        </plugin>
    </plugins>
</build>

Answer 1

当我想要一个可以执行任何几个主类的jar时，我只包含一个maven程序集执行，并指定了一个主类。当我想执行那个主类时，我会正常执行jar，例如：

java -jar Test-1.0-SNAPSHOT.jar

当我想执行其他主要类之一时，我将jar指定为类路径并指定我想在命令行上执行的类。例如：

java -cp Test-1.0-SNAPSHOT.jar com.my.test.main.SecondMain

请注意使用-cp代替-jar。

mvn包用多个程序集构建一个jar

1 个答案: