多模块项目的 Kotlin 编译错误"Unresolved reference"

Question

我有一个多模块结构的spring-boot应用程序。

first-module:
- services:
- interfaces.kt

second-module:
...

第二个模块具有弹簧引导应用

@SpringBootApplication
class Application {
companion object {
@JvmStatic
fun main(args: Array<String>) {
SpringApplicationBuilder(Application::class.java)
.initializers(ConfigServerInitializer.create())
.run(*args)
}
}
}

并且second-module也有接口实现。但当我使用maven编译它时，我面临着下一个错误：

[WARNING] Using experimental Kotlin incremental compilation
[INFO] Non-incremental compilation will be performed: No information on previous build
[INFO] Kotlin compile iteration: /Users/slandshow/Project/Test/test-project/src/main/kotlin/org/test/Application.kt, /Users/slandshow/Project/Test/test-project/src/main/kotlin/org/test/template/TemplateService.kt
[INFO] Exit code: COMPILATION_ERROR
.../template/TemplateService.kt: (4, 32) Unresolved reference: models
...

我真的不明白为什么我会有这样的编译问题。

此外，我还有下一个pom插件。

1. 第一个模块

<build>
<plugins>
<plugin>
<artifactId>kotlin-maven-plugin</artifactId>
<groupId>org.jetbrains.kotlin</groupId>
<version>${kotlin.version}</version>
<configuration>
<compilerPlugins>
<plugin>no-arg</plugin>
</compilerPlugins>
</configuration>
<dependencies>
<dependency>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-maven-noarg</artifactId>
<version>${kotlin.version}</version>
</dependency>
</dependencies>
</plugin>
</plugins>
</build>

2. 第二模块

<build>
<plugins>
<plugin>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-maven-plugin</artifactId>
<version>${kotlin.version}</version>
<configuration>
<compilerPlugins>
<plugin>spring</plugin>
</compilerPlugins>
</configuration>
<executions>
<execution>
<id>compile</id>
<phase>compile</phase>
<goals>
<goal>compile</goal>
</goals>
<configuration>
<sourceDirs>
<sourceDir>${project.basedir}/src/main/kotlin</sourceDir>
<sourceDir>${project.basedir}/src/main/java</sourceDir>
</sourceDirs>
</configuration>
</execution>
<execution>
<id>test-compile</id>
<phase>test-compile</phase>
<goals>
<goal>test-compile</goal>
</goals>
<configuration>
<sourceDirs>
<sourceDir>${project.basedir}/src/test/kotlin</sourceDir>
<sourceDir>${project.basedir}/src/test/java</sourceDir>
</sourceDirs>
</configuration>
</execution>
</executions>
<dependencies>
<dependency>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-maven-allopen</artifactId>
<version>${kotlin.version}</version>
</dependency>
</dependencies>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<executions>
<execution>
<id>default-compile</id>
<phase>none</phase>
</execution>
<execution>
<id>default-testCompile</id>
<phase>none</phase>
</execution>
<execution>
<id>java-compile</id>
<phase>compile</phase>
<goals>
<goal>compile</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>${maven-surefire-plugin.version}</version>
<configuration>
<includes>
<include>**/*IT.*</include>
<include>**/*Test.*</include>
</includes>
</configuration>
</plugin>
</plugins>
</build>

3. 常见pom

<dependency>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-stdlib-common</artifactId>
<version>${kotlin.version}</version>
</dependency>
<dependency>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-reflect</artifactId>
<version>${kotlin.version}</version>
</dependency>
<dependency>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-maven-allopen</artifactId>
<version>${kotlin.version}</version>
<exclusions>
<exclusion>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-stdlib</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-maven-noarg</artifactId>
<version>${kotlin.version}</version>
<exclusions>
<exclusion>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-stdlib</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<executions>
<execution>
<id>default-compile</id>
<phase>none</phase>
</execution>
<execution>
<id>default-testCompile</id>
<phase>none</phase>
</execution>
<execution>
<id>java-compile</id>
<phase>compile</phase>
<goals>
<goal>compile</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>

这里怎么了？

Answer 1

我创建了多个使用多模块结构的项目，但这个项目有点独特；因为其中一个子模块只持有后来被另一个子模块使用的服务。

类似的场景在Spring文档中为多模块java项目定义。

我花了一些时间创建了这个github repo，它创建了您想要的多模块结构。

请看一看，如果你有任何问题，请告诉我。