spring-boot - Spring Boot (kotlin) 循环依赖
问题描述
我使用 Spring Boot Initializer 创建了 Spring Boot 项目。我添加了核心、数据和服务模块。现在我在构建后和 IntelliJ 项目结构中看到一个警告:项目 exampleapi:“服务”模块、“数据”模块、“核心”模块之间存在循环依赖关系。
这是我的pom:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<packaging>jar</packaging>
<modules>
<module>service</module>
<module>data</module>
<module>core</module>
</modules>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.2.6.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.mjana</groupId>
<artifactId>exampleapi</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>exampleapi</name>
<description>Example Api</description>
<properties>
<java.version>11</java.version>
<kotlin.version>1.3.71</kotlin.version>
</properties>
<repositories>
<repository>
<id>exposed</id>
<name>exposed</name>
<url>https://dl.bintray.com/kotlin/exposed</url>
</repository>
</repositories>
<dependencies>
<!--Modules-->
<dependency>
<groupId>com.mjana</groupId>
<artifactId>core</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>com.mjana</groupId>
<artifactId>service</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>com.mjana</groupId>
<artifactId>data</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
<!--Data-->
<dependency>
<groupId>com.microsoft.sqlserver</groupId>
<artifactId>mssql-jdbc</artifactId>
<version>8.2.1.jre11</version>
</dependency>
<dependency>
<groupId>org.jetbrains.exposed</groupId>
<artifactId>exposed-spring-boot-starter</artifactId>
<version>0.22.1</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jdbc</artifactId>
<version>2.2.6.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.module</groupId>
<artifactId>jackson-module-kotlin</artifactId>
</dependency>
<dependency>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-reflect</artifactId>
</dependency>
<dependency>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-stdlib-jdk8</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
<build>
<sourceDirectory>${project.basedir}/src/main/kotlin</sourceDirectory>
<testSourceDirectory>${project.basedir}/src/test/kotlin</testSourceDirectory>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-maven-plugin</artifactId>
<configuration>
<args>
<arg>-Xjsr305=strict</arg>
</args>
<compilerPlugins>
<plugin>spring</plugin>
</compilerPlugins>
</configuration>
<dependencies>
<dependency>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-maven-allopen</artifactId>
<version>${kotlin.version}</version>
</dependency>
</dependencies>
</plugin>
</plugins>
</build>
</project>
并且除了artifactId之外,每个模块的pom都是一样的:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-
4.0.0.xsd">
<parent>
<artifactId>exampleapi</artifactId>
<groupId>com.mjana</groupId>
<version>0.0.1-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>service</artifactId>
<packaging>jar</packaging>
</project>
解决方案
您会得到循环依赖错误 b/c 每个子模块都继承了父模块的配置,您在其中声明了对子模块的依赖关系。因此循环依赖错误。
您需要parent
从每个子项中删除引用,以免它们继承此依赖项配置。
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