如何解决gradle compileJava运行中相关子项目中“找不到符号错误”的问题

Question

我尝试使用不同层(web、业务、dataAccess、common）的子项目创建一个带有gradle的spring boot项目。

我按照官方分级指南的指示创建多项目构建。

这两个子项目最初都是用Spring.io创建的。

问题

我尝试使用在其他子项目DataAccess中常见的子项目的user类。import在Intellij中运行良好。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：class用户位置：class MyProjectDataApplication）

common项目在dataAccess项目之前进行编译。我想这是一个分级配置问题，dataAccess项目在编译时不了解公共项目（也许是类路径问题？）。我很高兴有任何帮助。多谢了。

项目设置

• 我的项目
  • 通用
    • src/main//ch/wproglk/myproject/backend/common/entities
      • user.java
      • src/main/Java/ch/wproglk/myproject/backend/dataaccess
        • AcludataApplication.java

        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/Common/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/Common/Settings.Gradle

        rootProject.name = 'common'
        

        myproject/common/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/DataAccess/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/DataAccess/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

缺少设置两个配置以指示common是库。因此，添加以下配置，并从项目根目录添加compile、run。

通用Build.Gradle

bootJar {
    enabled = false
}

jar {
    enabled = true
}