Question

我尝试使用用于不同层（Web，业务，dataAccess，common）的子项目来创建带有gradle的spring boot项目。

我遵循了官方gradle指南Creating Multi-Projects builds的指示。

两个子项目最初都是使用Spring.io创建的。

问题

我尝试在其他子项目 dataAccess 中使用子项目 common 的User类。导入在Intellij中工作正常。但是，当我运行gradlew :dataAccess:compileJava时，任务失败，因为找不到User：

任务：dataAccess：compileJava失败 ... \ dataAccess \ src \ main \ java \ ch \ wprogLK \ MyProject \ backend \ dataAccess \ MyProjectDataApplication.java：23：错误：找不到符号用户u = new User（）; ^ 符号：类User 位置：类MyProjectDataApplication）

common 项目在 dataAccess 项目之前进行编译。我猜这是一个gradle配置问题，即 dataAccess 项目在编译时对 common 项目一无所知（也许是类路径问题？）。我很高兴有任何帮助。谢谢。

项目设置

我的项目
- 常见
  - src / main / java / ch / wprogLK / myProject / backend / common / entities
    - User.java
  - build.gradle
  - settings.gradle
- 数据访问
  - src / main / java / ch / wprogLK / myProject / backend / dataAccess
    - AcLuDataApplication.java
  - build.gradle
  - settings.gradle
- build.gradle
- settings.gradle

代码

MyProject /build.gradle

plugins {
    id 'org.springframework.boot' version '2.1.8.RELEASE'
    id 'io.spring.dependency-management' version '1.0.8.RELEASE'
    id 'java'
}

group = 'ch.wprogLK'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = '1.8'

repositories {
    mavenCentral()
}

allprojects {
    apply plugin: 'java' 
}

dependencies {
    implementation 'org.springframework.boot:spring-boot-starter-web'
}

MyProject /settings.gradle

rootProject.name = 'MyProject'

include 'common'
include 'dataAccess'

MyProject / 常见 /build.gradle

plugins {
    id 'org.springframework.boot'
    id 'io.spring.dependency-management'
    id 'java'
}

group = 'ch.wprogLK'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = '1.8'

repositories {
    mavenCentral()
}

dependencies {
}

MyProject / 常见 /settings.gradle

rootProject.name = 'common'

MyProject / 常见 /src/main/java/ch/wprogLK/myProject/backend/common/entities/User.java

package ch.wprogLK.myProject.backend.common.entities;
public class User
{
    private Long userId;
    private String username;
}

MyProject / 数据访问 /build.gradle

plugins {
    id 'org.springframework.boot'
    id 'io.spring.dependency-management'
    id 'java'
}

group = 'ch.wprogLK'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = '1.8'

repositories {
    mavenCentral()
}

dependencies {
    compile project(":common")
}

MyProject / 数据访问 /settings.gradle

rootProject.name = 'dataAccess'

MyProject / dataAccess /src/main/java/ch/wprogLK/myProject/backend/dataAccess/MyProjectDataApplication.java

package ch.wprogLK.myProject.backend.dataAccess;
import ch.wprogLK.myProject.backend.common.entities.User;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class MyProjectDataApplication 
{
    public static void main(String[] args)
    {
        SpringApplication.run(MyProjectDataApplication.class, args);
    }

    public MyProjectDataApplication()
    {
        User u = new User(); //This line is the problem when running gradle :dataAccess:javaCompile
    }
}

Answer 1

缺少两个设置来表明common是一个库。因此，从项目的根目录添加以下配置以及compile和run。

common build.gradle

bootJar {
    enabled = false
}

jar {
    enabled = true
}

如何在运行gradle compileJava

1 个答案: