Gradle不在gradle构建上维护目录层次结构

Question

我正在使用gradle来构建它。文件夹结构如下：

java_data_structures
├── build.gradle
├── build
|   ├── classes
|   |   ├── groovy
|   |   |   └── test
|   |   |       └── DoublyLinkedListSpec.class
|   |   └── java
|   |       └── main
|   |           ├── Application.class
|   |           └── DoublyLinkedList.class
|   ├── distributions
|   └── other
|
└── src
    ├── main
    │   └── java
    │       ├── Application.java
    │       ├── graphs
    │       ├── maps
    │       ├── matricies
    │       ├── sets
    │       ├── trees
    │       ├── vectors
    │       |   └── DoublyLinkedList.java
    │       └── Application.java  
    └── test
        └── groovy
            └── vectors
                └── DoublyLinkedListSpec.groovy

问题是，build/classes/java和build/classes/groovy中的文件夹结构已经更改。它只是将所有类文件归为一个文件夹 - main和tests。这对我来说是个问题，因为在我的Application.java文件中，我有以下代码：

public class Application {

  public static void main(String[] args) {
    DoublyLinkedList<Integer> list;
    Integer[] array = {1, 2, 3};

    list = new DoublyLinkedList<Integer>(array);

    System.out.println(list);

  }
}

我可以在不使用DoublyLinkedList声明的情况下访问import。我希望我的代码看起来像这样：

import vectors.DoublyLinkedList;

public class Application {

  public static void main(String[] args) {
    DoublyLinkedList<Integer> list;
    Integer[] array = {1, 2, 3};

    list = new DoublyLinkedList<Integer>(array);

    System.out.println(list);

  }
}

但是，当我使用上面的代码运行gradle build时，我收到以下错误：

> Task :compileJava
/Users/jod/java_data_structures/src/main/java/Application.java:1: error: package vectors does not exist
import vectors.DoublyLinkedList;
              ^
1 error


FAILURE: Build failed with an exception.

这是可以预期的，因为build/classes/java/main文件夹的结构具有彼此相邻的所有类文件而没有它们各自的文件夹。我的gradle.build文件如下：

apply plugin: 'java'
apply plugin: 'groovy'
apply plugin: 'application'

sourceCompatibility = 1.8
targetCompatibility = 1.8

mainClassName = "Application"

jar {
  baseName = 'java_data_structures'
  version = '0.0.1'
}

repositories {
  mavenCentral()
}

dependencies {
  testCompile(
    'junit:junit:4.12',
    'org.codehaus.groovy:groovy-all:2.4.4',
    'org.spockframework:spock-core:1.0-groovy-2.4',
    'org.springframework.boot:spring-boot:1.2.1.RELEASE',
    'cglib:cglib-nodep:2.2.2'
  )
}

javadoc {
  destinationDir = new File("${projectDir}/doc/javadoc")
  source = sourceSets.main.allJava
  classpath = configurations.compile
}

我需要做什么才能使我的文件夹层次结构保持不变？这是我想要的结构：

java_data_structures
├── build.gradle
├── build
|   ├── classes
|   |   ├── groovy
|   |   |   └── test
|   |   |       └── vectors
|   |   |           └── DoublyLinkedList.class
|   |   └── java
|   |       └── main
|   |           ├── Application.class
|   |           └── vectors
|   |               └── DoublyLinkedList.class
|   ├── distributions
|   └── other
|
└── src
    ├── main
    │   └── java
    │       ├── Application.java
    │       ├── graphs
    │       ├── maps
    │       ├── matricies
    │       ├── sets
    │       ├── trees
    │       ├── vectors
    │       |   └── DoublyLinkedList.java
    │       └── Application.java  
    └── test
        └── groovy
            └── vectors
                └── DoublyLinkedListSpec.groovy