Question

我有一个使用gradle的春季启动项目

apply plugin: 'java'
apply plugin: 'idea'
apply plugin: 'jetty'
apply plugin: 'war'
apply plugin: 'org.springframework.boot'

repositories {
    mavenCentral()
}

dependencies {
    compile("org.springframework.boot:spring-boot-starter-web:1.5.1.RELEASE") {
        exclude module: "spring-boot-starter-tomcat"
    }
    compile group: 'org.springframework.boot', name: 'spring-boot-starter-jetty', version: '1.5.1.RELEASE'
    compile group: 'org.springframework.boot', name: 'spring-boot-starter-actuator', version: '1.5.1.RELEASE'
    compile group: 'org.springframework', name: 'spring-webmvc', version: '4.3.6.RELEASE'
    compile group: 'org.springframework', name: 'spring-context-support', version: '4.3.6.RELEASE'
    compile group: 'org.springframework', name: 'spring-orm', version: '4.3.6.RELEASE'
    compile group: 'javax.servlet', name: 'javax.servlet-api', version: '3.1.0'
    compile group: 'org.freemarker', name: 'freemarker', version: '2.3.23'
    compile group: 'mysql', name: 'mysql-connector-java', version: '6.0.5'
    compile group: 'org.hibernate', name: 'hibernate-core', version: '5.1.4.Final'
    compile group: 'commons-validator', name: 'commons-validator', version: '1.5.1'
    compile group: 'junit', name: 'junit', version: '4.12'
    compile group: 'org.springframework.boot', name: 'spring-boot-starter-test', version: '1.5.1.RELEASE'
}

task wrapper(type: Wrapper) {
    gradleVersion = '2.2'
}

buildscript {
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath("org.springframework.boot:spring-boot-gradle-plugin:1.5.1.RELEASE")
    }
}

jar {
    baseName = 'base-name'
    version = '0.1.0'
    manifest {
        attributes 'Main-Class': 'some.application.Application'
    }
}

sourceCompatibility = 1.8
targetCompatibility = 1.8

我建立使用
./gradlew clean jar
然后尝试使用
运行 java -jar <jar-name>.jar

但是我收到错误

Exception in thread "main" java.lang.NoClassDefFoundError: org/springframework/boot/SpringApplication
        at some.application.Application.main(Application.java:11)
Caused by: java.lang.ClassNotFoundException: org.springframework.boot.SpringApplication
        at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        ... 1 more

我很困惑为什么我可以在IDE中运行它而不是jar。我还发现我的罐子里根本没有任何库。

编辑：

这是我的Application.class

打包some.application;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Application
{
    public static void main(String[] args)
    {
        SpringApplication.run(Application.class, args);
    }
}

Answer 1

这是因为您的依赖项未包含在结束jar文件中。

查看示例here或here。

或者使用应自动正确打包应用的./gradlew clean build。看看the official guide

Answer 2

在fatJar中定义一个名为build.gradle的任务：

jar {
    baseName = 'base-name'
    version = '0.1.0'
    manifest {
        attributes(
                'Main-Class': 'com.github:'
        )
    }
}

task fatJar(type: Jar) {
    manifest.from jar.manifest
//    classifier = 'all'
    from {
        configurations.runtime.collect { it.isDirectory() ? it : zipTree(it) }
    } {
        exclude "META-INF/*.SF"
        exclude "META-INF/*.DSA"
        exclude "META-INF/*.RSA"
    }
    with jar
}

artifacts {
    archives fatJar
}

运行gradle fatJar或./gradlew fatJar来生成具有所有依赖项的jar文件，该文件可以独立运行，但是可能很大（这就是为什么它被称为胖子）的原因。 / li>

java.lang.NoClassDefFoundError：尝试运行jar时

2 个答案: