Spring Boot Multi Module Gradle Project 类路径问题：Package Not Found, Symbol not Found

Posted 2023-02-27

【中文标题】Spring Boot Multi Module Gradle Project 类路径问题：Package Not Found, Symbol not Found

【英文标题】：Spring Boot Multi Module Gradle Project classpath problem: Package Not Found, Symbol not Found

【发布时间】：2020-09-24 22:04:57

【问题描述】：

我有一个 Spring Boot gradle 项目 etl，它依赖于另一个名为 common 的项目中的公共核心类。

common/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()

etl 项目和common 项目在文件系统的同一级别中并排。

问题是，每当我尝试构建依赖于common 的etl 项目时，它都会显示一些关于我希望从common 项目中获得并可用的类的问题。

我已使用includeFlat 将common 包含在etl 项目中的settings.gradle 中，并且无法追踪有关gradle 多模块包含机制的任何问题。

这个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。

【参考方案1】：

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

...

bootJar 
    enabled = false


jar 
    enabled = true


...