java Intellij Maven：使用所有库依赖项创建 jar
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Intellij Maven: Create jar with all library dependencies
提问by D. Müller
Working with IntelliJ Idea, I want to implement the following:
使用 IntelliJ Idea，我想实现以下内容：
I want to export an application to a jar, which contains all needed libraries. E.g. I need the AWS Java SDK libraries for S3 access, but if I upload the jar to the server and run the jar I get an NoClassDefFoundError, see below:
我想将应用程序导出到 jar，其中包含所有需要的库。例如，我需要 AWS Java SDK 库来访问 S3，但是如果我将 jar 上传到服务器并运行该 jar，我会收到 NoClassDefFoundError，请参见下文：
Exception in thread "main" java.lang.NoClassDefFoundError: com/amazonaws/auth/AWSCredentials
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2625)
at java.lang.Class.getMethod0(Class.java:2866)
at java.lang.Class.getMethod(Class.java:1676)
at sun.launcher.LauncherHelper.getMainMethod(LauncherHelper.java:494)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:486)
Caused by: java.lang.ClassNotFoundException: com.amazonaws.auth.AWSCredentials
at java.net.URLClassLoader.run(URLClassLoader.java:366)
at java.net.URLClassLoader.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
... 6 more
Comparison: I created the same project in Eclipse and get no error! The jar file sizes are very different (Eclipse: ~35 MB vs. IntelliJ Idea: ~5,5 MB)!
比较：我在 Eclipse 中创建了相同的项目并且没有出错！jar 文件大小非常不同（Eclipse：~35 MB 与 IntelliJ Idea：~5,5 MB）！
I included the libraries via Maven and downloaded them also into the "lib" folder of my project:
我通过 Maven 包含了这些库，并将它们也下载到了我的项目的“lib”文件夹中：
As parameter in the run configurations I set "package", see screenshot below:
作为运行配置中的参数，我设置了“包”，请参见下面的屏幕截图：
SOLUTION:
解决方案：
Thanks for all your hints, I got it to work now! The trick was that I did't add the dependencies to the pom.xml file (because I thought that this would be done automatically after setting them in the Project Structure, but it didn't)!!! See also my other question: Intellij IDEA Maven Plugin - Manage Dependenciesand https://www.jetbrains.com/idea/help/maven.html! Add the dependencies by
感谢您的所有提示，我现在可以使用了！诀窍是我没有将依赖项添加到 pom.xml 文件中（因为我认为这会在项目结构中设置它们后自动完成，但事实并非如此）！！！另请参阅我的另一个问题：Intellij IDEA Maven 插件 - 管理依赖项和https://www.jetbrains.com/idea/help/maven.html！添加依赖项
- Open pom.xml
- Menu "Code" > "Generate" > "Dependency" (or shortcut ALT + INSERT)
- 打开 pom.xml
- 菜单“代码”>“生成”>“依赖项”（或快捷键 ALT + INSERT）
回答by Héctor
You need to use Maven Assembly Plugin to include dependencies:
您需要使用 Maven Assembly Plugin 来包含依赖项：
<build>
<plugins>
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<configuration>
<archive>
<manifest>
<mainClass>your.package.MainClass</mainClass>
</manifest>
</archive>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
</plugin>
</plugins>
</build>
and then: mvn clean compile assembly:single
接着： mvn clean compile assembly:single
回答by emanciperingsivraren
I recommend that you use the plugin shade. It is better than Assemblybecause it is possible to relocate classesif a conflict occur.
我建议您使用插件shade。这比Assembly因为发生冲突时可以重新定位类要好。
A typical setup can look like this: (copied from the official documentation)
典型的设置可能如下所示：（从官方文档中复制）
<project>
...
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>2.4.2</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<artifactSet>
<excludes>
<exclude>classworlds:classworlds</exclude>
<exclude>junit:junit</exclude>
<exclude>jmock:*</exclude>
<exclude>*:xml-apis</exclude>
<exclude>org.apache.maven:lib:tests</exclude>
<exclude>log4j:log4j:jar:</exclude>
</excludes>
</artifactSet>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
...
</project>
If size is important you can try to use the <minimizeJar>true</minimizeJar>to reduce size.
如果尺寸很重要，您可以尝试使用<minimizeJar>true</minimizeJar>来减小尺寸。
