java - 使用 gradle 处理 asm 依赖项时出现 NoClassDefFoundError

Question

当我尝试使用 gradle 使用 asm 包构建程序时，出现以下错误:

Exception in thread "main" java.lang.NoClassDefFoundError: org/objectweb/asm/ClassVisitor
    at analysis.CCMetric.main(CCMetric.java:5)
Caused by: java.lang.ClassNotFoundException:org.objectweb.asm.ClassVisitor
    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

我的gradle脚本如下:

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

mainClassName = 'analysis.CCMetric'

repositories {
    maven { url "http://repo.maven.apache.org/maven2" }    
}

sourceCompatibility = 1.8
targetCompatibility = 1.8

dependencies {
    compile 'org.ow2.asm:asm-all:5.0.2'
    compile 'commons-io:commons-io:2.4'
    compile 'org.jgrapht:jgrapht-core:0.9.1'
    compile 'asm:asm:3.3.1'
}

jar {
    manifest {
        attributes 'Main-Class': 'analysis.CCMetric'
    }
    baseName = 'CCMetric'
    version = '1.0.0'
}

task wrapper(type: Wrapper) {
    gradleVersion = '2.9'
}

我使用 gradle build 来构建项目，并使用 java -jar build/libs/CCMetric.jar 运行 jar 文件，然后得到了上述异常。

Answer 1

我从 Gradle 论坛找到了解决方案。现在我粘贴 Muschko, B 的答案。

You will also have to provide the external JARs you are depending on when executing the Java command. Gradle does not hook into the Java command magically and provide the external libraries. A good alternatively you can look into is the Application plugin which does something you are looking for out-of-the-box with the run task.