Java 无法在deployable.jar中加载主类
我正在尝试构建一个可执行jar,但得到的错误是:找不到或加载主类com.company.app.main。我已经重新启动了我的电脑,并尝试清理这个项目。我也尝试过使用Java 无法在deployable.jar中加载主类,java,maven,Java,Maven,我正在尝试构建一个可执行jar,但得到的错误是:找不到或加载主类com.company.app.main。我已经重新启动了我的电脑,并尝试清理这个项目。我也尝试过使用true,但运气不好 <build> <plugins> <plugin> <artifactId>maven-assembly-plugin</artifactId> <configuratio
true
,但运气不好
<build>
<plugins>
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<configuration>
<archive>
<manifest>
<mainClass>com.company.app.Main</mainClass>
</manifest>
</archive>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>2.4</version>
<configuration>
<skip>true</skip>
</configuration>
</plugin>
</plugins>
</build>
maven汇编插件
com.company.app.Main
带有依赖项的jar
包裹
单一的
org.apache.maven.plugins
maven jar插件
2.4
真的
是目前获得胖可执行jar的最简单解决方案
$ tree executable-jar-with-dependencies/
executable-jar-with-dependencies/
|-- pom.xml
`-- src
`-- main
`-- java
`-- com
`-- stackexchange
`-- stackoverflow
`-- ExecutableJar.java
6 directories, 2 files
pom.xml:
<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.stackoverflow</groupId>
<artifactId>question-19281476</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<build>
<plugins>
<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>
</configuration>
</plugin>
<!--
I prefer to use the maven-shade-plugin because the final built artifact maintains the original name
instead of appending "jar-with-dependencies" to the built artifact. But the maven-assembly-plugin works fine too.
-->
<!--
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>2.1</version>
<executions>
<execution>
<phase>package</phase>
<goals><goal>shade</goal></goals>
<configuration>
<transformers>
<transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass>com.stackexchange.stackoverflow.ExecutableJar</mainClass>
</transformer>
</transformers>
</configuration>
</execution>
</executions>
</plugin>
-->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<version>2.4</version>
<configuration>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
<archive>
<manifest>
<mainClass>com.stackexchange.stackoverflow.ExecutableJar</mainClass>
</manifest>
</archive>
</configuration>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
现在,从命令行执行以下命令可以演示这一点:
$ mvn clean package
$ java -jar target/question-19281476-1.0-SNAPSHOT-jar-with-dependencies.jar
Hello World
我不确定,但也许maven jar插件正在覆盖maven汇编插件的配置。此外,maven assembly插件在打包阶段将“jar with dependencies”附加到生成的工件上。只有那个工件是可执行的。maven shade插件不能做到这一点。请参阅下面我的答案中的一个工作示例。
$ mvn clean package
$ java -jar target/question-19281476-1.0-SNAPSHOT-jar-with-dependencies.jar
Hello World