[英]Fat JAR not working. "No Main Manifest Attribute". Tried POM file, still failing
I have a Netbeans project with Maven that I'm trying to compile into an executable JAR file.我有一个带有 Maven 的 Netbeans 项目,我试图将它编译成一个可执行的 JAR 文件。 I think so far everything works fine inside Netbeans however when I package it was a 20kb file-SNAPSHOT and couldnt get it to run.我认为到目前为止在 Netbeans 中一切正常,但是当我打包它是一个 20kb 的文件 SNAPSHOT 并且无法运行时。
Someone pointed me to some MAVEN code to package all dependencies and make it into a "FAT JAR" file.有人向我指出了一些 MAVEN 代码来打包所有依赖项并将其放入“FAT JAR”文件中。 I did that and started getting an error "No Main Manifest Attribute" I copied some more MAVEN snippets to add the main manifest however I still get the same error "No Main Manifest" so I assume I did something wrong.我这样做并开始收到错误“没有主清单属性”我复制了更多的 MAVEN 片段来添加主清单但是我仍然收到相同的错误“没有主清单”所以我认为我做错了什么。 Here's my POM.XML file: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>com.MyCompany</groupId>
<artifactId>Client_BoxTest</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<dependencies>
<dependency>
<groupId>com.fazecast</groupId>
<artifactId>jSerialComm</artifactId>
<version>[2.0.0,3.0.0)</version>
</dependency>
</dependencies>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>14</maven.compiler.source>
<maven.compiler.target>14</maven.compiler.target>
</properties>
<build>
<finalName>Client-Boxtest</finalName>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.6.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
<plugin>
<!-- Build an executable JAR -->
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>3.1.1</version>
<configuration>
<archive>
<manifest>
<addClasspath>true</addClasspath>
<classpathPrefix>lib/</classpathPrefix>
<mainClass>my.client_boxtest.BoxTestUI</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<version>3.1.1</version>
<configuration>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
<executions>
<execution>
<id>make-assembly</id>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
Now I am not sure about the location of my main class: it's a fairly simple program and my tree in NetBeans looks like this, with only one file:现在我不确定我的主类的位置:这是一个相当简单的程序,我在 NetBeans 中的树看起来像这样,只有一个文件:
The maven-shade-plugin is much more powerful for create an Uber jar or fat jar and is the preferred plugin for this task for over ten years. maven-shade-plugin 对于创建 Uber jar 或 fat jar 来说功能更强大,并且是该任务十多年来的首选插件。 https://maven.apache.org/plugins/maven-shade-plugin/examples/executable-jar.html describes how you should specify the mainClass. https://maven.apache.org/plugins/maven-shade-plugin/examples/executable-jar.html描述了您应该如何指定 mainClass。
Try to add a reference to the main class in your POM as described below, it works for me:尝试在 POM 中添加对主类的引用,如下所述,它对我有用:
<project>
[...]
<build>
[...]
<plugins>
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<version>3.3.0</version>
<configuration>
[...]
<archive>
<manifest>
<mainClass>org.sample.App</mainClass>
</manifest>
</archive>
</configuration>
[...]
</plugin>
[...]
</project>
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