Gradle Build输出Jar不运行

Question

首先，这可能是Gradle build successful, error running jar

的欺骗

我构建了一个使用Gradle构建的非常基本的Dropwizard项目。我的build.gradle文件看起来像这样：

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

// use Java 1.8 by default
sourceCompatibility = 1.8
targetCompatibility = 1.8

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

// application version and name
mainClassName='com.mydomain.WebServiceApplication'
version = '0.1-' + (System.getenv("SVN_REVISION") == null ? "0" : System.getenv("SVN_REVISION"))
jar {
    manifest {
        attributes 'Implementation-Title': 'WebService',
                   'Implementation-Version': version,
                   'Main-Class': mainClassName
    }
}

// project variables go here
project.ext {
    dropwizardVersion='0.9.1'
}

// repositories that we're getting libraries from
repositories {
    mavenCentral()
}

dependencies {
    // compile-time dependencies
    compile (
        'commons-collections:commons-collections:3.2',
        'io.dropwizard:dropwizard-core:' + dropwizardVersion,
        'io.dropwizard:dropwizard-client:' + dropwizardVersion,
        'org.logback-extensions:logback-ext-loggly:0.1.4',
        'ch.qos.logback.contrib:logback-json-classic:0.1.2',
        'ch.qos.logback.contrib:logback-jackson:0.1.2'
    )

    // test dependencies - these will be stripped from production jar
    testCompile (
        'io.dropwizard:dropwizard-testing:' + dropwizardVersion,
        'junit:junit:4.+'
    )
}

run {
    args 'server', './src/main/resources/config.yml'
}

当我运行gradle build时，会创建一个包含名为./build/libs/的jar的webservice-0.1.jar文件夹。如果我尝试使用java -jar webservice-0.1.jar执行此jar，则会收到错误Error: Could not find or load main class com.mydomain.WebServiceApplication。

事情是，那个文件肯定存在。我可以做到以下几点：

$ makedir tmp
$ cd tmp
$ unzip ../webservice-0.1.jar
$ ls ./com/mydomain/

，文件WebServiceApplication.class就在那里。为了让java在我的jar里面找到类，我是否需要做某种类路径事务？我迷失了。