java – Shadow Plugin Gradle：mergeServiceFiles()做什么？

在我的build.gradle文件中,我需要添加以下行：

shadowJar {
    mergeServiceFiles()
}

否则罐子不能正常运行.我想知道这条线到底是做什么的？
我在Eclipse Luna中使用Gradle插件.我在一个Java项目上创建了jar,它依赖于另一个Java项目.

解决方法

/**
 * Syntactic sugar for merging service files in JARs
 * @return
 */
public ShadowJar mergeServiceFiles() {
    try {
        transform(ServiceFileTransformer.class);
    } catch (IllegalAccessException e) {
    } catch (InstantiationException e) {
    }
    return this;
}

正如您所看到的,它使用了定义为here的ServiceFileTransfomer.来自其文档：

Modified from org.apache.maven.plugins.shade.resource.ServiceResourceTransformer.java

Resources transformer that appends entries in META-INF/services resources into a single resource. For example,if there are several META-INF/services/org.apache.maven.project.ProjectBuilder resources spread across many JARs the individual entries will all be concatenated into a single META-INF/services/org.apache.maven.project.ProjectBuilder resource packaged into the resultant JAR produced by the shading process.

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