Question

我用gradle在spring框架测试代码中构建jar文件。

然后运行jar文件“ java -jar jarFile.jar” 但是它无法运行并显示一些错误代码。

我在spring项目的build.gradle文件中检查了Main-Class属性和MANIFEST.FM文件放在jar文件中

这是我的主要课程Java代码

package com.apress.springrecipes.sequence;

import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

import com.apress.springrecipes.sequence.config.SequenceConfiguration;

public class Main {

    public static void main(String[] args) {

        ApplicationContext context =
                new AnnotationConfigApplicationContext(SequenceConfiguration.class);

        SequenceGenerator generator = context.getBean(SequenceGenerator.class);

        System.out.println(generator.getSequence());
        System.out.println(generator.getSequence());
    }
}

这是我的build.gradle文件

apply plugin: 'java'
apply plugin: 'eclipse'
apply plugin: 'application'

mainClassName = "com.apress.springrecipes.sequence.Main"

repositories {
    mavenCentral()
}

jar {
    baseName = "${rootProject.name}"
    version =  "0.0.1-SNAPSHOT"
    manifest {
        attributes "Implementation-Title": "${rootProject.name}",
                   "Implementation-Version": version,
                   "Main-Class": "${mainClassName}"
    }
}

sourceCompatibility = 1.8
targetCompatibility = 1.8

ext {
    springVersion = '4.2.0.RELEASE'
}

[compileJava, compileTestJava]*.options*.encoding = 'UTF-8'

dependencies {
    compile "org.springframework:spring-core:${springVersion}"
    compile "org.springframework:spring-context:${springVersion}"
    compile "org.slf4j:slf4j-simple:1.7.25"
}

这是jar文件中的MANIFEST.FM文件

Manifest-Version: 1.0
Implementation-Title: recipe_2_2
Implementation-Version: 0.0.1-SNAPSHOT
Main-Class: com.apress.springrecipes.shop.Main

当我运行jar文件时，我收到错误消息

Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.NoClassDefFoundError: org/springframework/context/ApplicationContext
    at java.lang.Class.getDeclaredMethods0(Native Method)
    at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
    at java.lang.Class.privateGetMethodRecursive(Class.java:3048)
    at java.lang.Class.getMethod0(Class.java:3018)
    at java.lang.Class.getMethod(Class.java:1784)
    at sun.launcher.LauncherHelper.validateMainClass(LauncherHelper.java:544)
    at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:526)
Caused by: java.lang.ClassNotFoundException: org.springframework.context.ApplicationContext
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:338)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 7 more

我该如何解决？

Answer 1

gradle“应用程序”插件将在 build / distributions 中输出zip文件，因此您可以将其提取到文件夹中，该文件夹具有 bin /，lib /

您可以像

一样运行程序

bin/${rootProject.name}

请不要直接在lib中运行您的jar文件

Spring Gradle构建罐无法通过NoClassDefFoundError找到主类

1 个答案: