Spring Boot多模块Gradle项目类路径问题:未找到软件包，未找到符号

Question

我在另一个名为common的项目中有一个spring boot gradle项目etl，它依赖于公共核心类。

常见/build.gradle

plugins {
    id 'net.ltgt.apt' version '0.21'
    id 'org.springframework.boot'
    id 'io.spring.dependency-management'
    id "io.freefair.lombok" version "5.1.0"
    id 'java'
    id 'idea'
    id 'eclipse'
}

group = 'com.intelease'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = '1.8'

repositories {
    jcenter()
    mavenCentral()
    maven {
        name "lightbend-maven-release"
        url "https://repo.lightbend.com/lightbend/maven-releases"
    }
    maven {
        name "Sonatype Snapshots"
        url "https://oss.sonatype.org/content/repositories/snapshots/"
    }
    ivy {
        name "lightbend-ivy-release"
        url "https://repo.lightbend.com/lightbend/ivy-releases"
        layout "ivy"
    }
}

dependencies {
    implementation 'com.typesafe.play:play-java_2.13:2.7.3'
    implementation 'com.typesafe.akka:akka-actor-typed_2.13:2.5.23'
    implementation "com.typesafe.play:play-guice_2.12:2.6.15"

    implementation 'org.springframework.boot:spring-boot-starter-data-elasticsearch'
    implementation 'org.springframework.boot:spring-boot-starter-data-mongodb-reactive'

    implementation 'org.neo4j.driver:neo4j-java-driver:1.7.5'
    implementation 'org.apache.poi:poi-ooxml:3.17'
    implementation 'com.google.maps:google-maps-services:0.13.0'
    implementation 'org.apache.commons:commons-text:1.8'
    implementation 'com.google.cloud:google-cloud-language:1.19.0'
    implementation 'com.google.cloud:google-cloud-vision:1.19.0'
    implementation 'technology.tabula:tabula:1.0.2'
    implementation 'com.amazonaws:aws-java-sdk:1.11.618'
    implementation 'edu.stanford.nlp:stanford-corenlp:3.8.0'
    implementation 'nz.ac.waikato.cms.weka:weka-stable:3.8.4'
    // https://mvnrepository.com/artifact/com.typesafe.play/play-java
    implementation 'org.joda:joda-money:0.11'
    implementation 'com.feth:play-easymail_2.12:0.9.0'
    implementation 'com.feth:play-authenticate_2.12:0.9.0'
    implementation 'org.apache.commons:commons-imaging:1.0-alpha1'
    implementation 'com.github.cloudyrock.mongock:mongock-core:3.3.2'
    implementation 'com.github.cloudyrock.mongock:mongock-spring:3.3.2'
    implementation 'net.logstash.logback:logstash-logback-encoder:5.3'
    implementation 'ch.qos.logback:logback-core:1.2.3'
    implementation 'ch.qos.logback:logback-classic:1.2.3'
    implementation 'com.google.firebase:firebase-admin:6.13.0'
    implementation 'org.mapstruct:mapstruct:1.3.1.Final'
    implementation 'org.jgrapht:jgrapht-core:1.4.0'
    implementation 'org.jgrapht:jgrapht-io:1.4.0'
    implementation 'commons-io:commons-io:2.6'
    implementation 'org.springframework.guice:spring-guice:1.1.4.RELEASE'
    implementation 'com.google.inject:guice:4.2.3'
    implementation 'commons-collections:commons-collections:3.2.2'
    implementation 'org.aspectj:aspectjrt:1.9.5'
    implementation 'org.ghost4j:ghost4j:1.0.1'
    annotationProcessor 'org.mapstruct:mapstruct-processor:1.3.1.Final'

    testAnnotationProcessor 'org.mapstruct:mapstruct-processor:1.3.1.Final' // if you are using mapstruct in test code

    testImplementation 'io.projectreactor:reactor-test:3.3.0.RELEASE'
    testImplementation 'org.springframework.boot:spring-boot-starter-test:2.2.0.RELEASE'
    testImplementation 'cloud.localstack:localstack-utils:0.1.22'
    testImplementation 'nl.jqno.equalsverifier:equalsverifier:3.3'
    testImplementation 'net.aichler:jupiter-interface:0.8.3'
    testImplementation 'org.mockito:mockito-junit-jupiter:3.0.0'
    testImplementation 'org.assertj:assertj-core:3.13.2'
    testImplementation 'org.junit.jupiter:junit-jupiter-params:5.5.2'
}

etl/settings.gradle：

rootProject.name = 'etl'

includeFlat ('common')

etl/build.gradle：

plugins {
    id 'org.springframework.boot' version '2.2.7.RELEASE'
    id 'io.spring.dependency-management' version '1.0.9.RELEASE'
    id 'eclipse'
    id 'idea'
    id 'java'
}

group = 'com.intelease'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = '1.8'

repositories {
    mavenCentral()
    jcenter()
    maven {
        name "lightbend-maven-release"
        url "https://repo.lightbend.com/lightbend/maven-releases"
    }
    ivy {
        name "lightbend-ivy-release"
        url "https://repo.lightbend.com/lightbend/ivy-releases"
        layout "ivy"
    }
}

ext {
    set('springCloudVersion', "Hoxton.SR4")
}

dependencies {
    implementation project(':common')
    implementation 'org.apache.kafka:kafka-streams'
    implementation 'io.debezium:debezium-core:1.1.1.Final'
    implementation 'org.springframework.cloud:spring-cloud-stream'
    implementation 'org.springframework.cloud:spring-cloud-stream-binder-kafka-streams'
    testImplementation('org.springframework.boot:spring-boot-starter-test') {
        exclude group: 'org.junit.vintage', module: 'junit-vintage-engine'
    }


    testImplementation 'org.springframework.cloud:spring-cloud-stream-test-support'
}

dependencyManagement {
    imports {
        mavenBom "org.springframework.cloud:spring-cloud-dependencies:${springCloudVersion}"
    }
}

test {
    useJUnitPlatform()
}

在文件系统中，etl项目和common项目只是并排在同一级别。

问题是，每当我试图构建依赖于common的etl项目时，它都显示出一些关于我期望从common项目中引入和可用的类的问题。

我已经通过使用includeFlat将common包含到了settings.gradle inside etl项目中，并且没有追踪到任何关于gradle多模块包含机制的问题。

这种扁平的多模块生态系统有什么问题？

构建脚本是etl文件夹中的./gradlew clean build。

Answer 1

这个问题是因为spring boot插件在etl和common项目中都存在。所以我发现在cammon/build.gradle中我必须添加这段代码：

...

bootJar {
    enabled = false
}

jar {
    enabled = true
}

...