我使用spring boot编程REST API,它使用一些外部库,这些库通过我的pom.xml中的依赖项包含在内 . 如果我通过 mvn spring-boot:run 在IntelliJ中启动项目一切正常,但如果我尝试通过 mvn package 将所有东西打包到jar中,除了spring-boot之外,所有外部依赖性calsses都会丢失 . 但是,相应的jar文件将复制到jar的lib文件夹中 . 所以,如果我启动jar一切正常(回答getRequests等)但是只要我想初始化 FFmpegFrameGrabber 类型的变量(来自bytedeco)我得到一个 NoClassDefFoundError
我的POM看起来如下:
<?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>spring-boot-test</groupId>
<artifactId>test</artifactId>
<version>1.0-SNAPSHOT</version>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.2.7.RELEASE</version>
</parent>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.bytedeco</groupId>
<artifactId>javacv</artifactId>
<version>1.1</version>
</dependency>
</dependencies>
<build>
<finalName>${project.artifactId}</finalName>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
类型jar的结构(部分):
jar
你好
LIB
META-INF
组织
---- springframework
----这里应该是bytedeco(?)
提前致谢
编辑:最小(非)工作示例
package hello;
import org.bytedeco.javacv.FFmpegFrameGrabber;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.bind.annotation.RequestMapping;
@RestController
public class HelloController {
@RequestMapping("/")
public String index() {
String path = "D:\\TestVideos\\1\\original.mp4";
FFmpegFrameGrabber frameGrabber;
System.out.println("Starting Frame Grabber for: " + path);
frameGrabber = new FFmpegFrameGrabber(path);
try {
frameGrabber.start();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return "Greetings from Spring Boot! Opening: " + path;
}
}
和Application.java
package hello;
import java.util.Arrays;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ApplicationContext;
@SpringBootApplication
public class Application {
public static void main(String[] args) {
ApplicationContext ctx = SpringApplication.run(Application.class, args);
System.out.println("Let's inspect the beans provided by Spring Boot:");
String[] beanNames = ctx.getBeanDefinitionNames();
Arrays.sort(beanNames);
for (String beanName : beanNames) {
System.out.println(beanName);
}
}
}
这是直接来自 Spring 季启动教程 . 再次坦克
1 回答
在
pom.xml
<build><plugins> ... </plugins></build>
部分添加以下插件 . 构建maven项目并执行jar命令 . 这个插件会将所有依赖的jar打包到最终的可执行jar中 .此页面包含有关maven程序集插件的更多信息 - https://maven.apache.org/plugins/maven-assembly-plugin/usage.html