尝试运行应用程序时出现Micronaut NonUniqueBeanException

问题描述

我正在尝试将Micronaut项目从1.3.2升级到最新版本版。我已经开始使用mn create-app实用程序来生成一个新的骨架项目，为此，我使用了其build.gradle文件来帮助我进行迁移。

我已经处理了所有依赖关系，并且能够正确构建应用程序，但是当我尝试运行它时，出现以下异常：

Message: Multiple possible bean candidates found: [com.mongodb.client.MongoClient,com.mongodb.client.MongoClient]
Path Taken: new MailSenderListener([CampaignEmailRepository emailRepository],CampaignRunRepository runRepository,CampaignEmailResponseConverter converter) --> new CampaignEmailRepositoryImpl([MongoClient mongoClient])
    at io.micronaut.context.AnnotationProcessorListener.onCreated(AnnotationProcessorListener.java:92)
    at io.micronaut.context.AnnotationProcessorListener.onCreated(AnnotationProcessorListener.java:45)
    at io.micronaut.context.DefaultBeanContext.doCreateBean(DefaultBeanContext.java:1954)
    at io.micronaut.context.DefaultBeanContext.addCandidatetoList(DefaultBeanContext.java:2990)
    at io.micronaut.context.DefaultBeanContext.getBeansOfTypeInternal(DefaultBeanContext.java:2865)
    at io.micronaut.context.DefaultBeanContext.streamOfType(DefaultBeanContext.java:772)
    at io.micronaut.context.DefaultBeanContext.streamOfType(DefaultBeanContext.java:759)
    at io.micronaut.context.DefaultBeanContext.lambda$initializeContext$32(DefaultBeanContext.java:1596)
    at java.base/java.util.HashMap.forEach(HashMap.java:1336)
    at io.micronaut.context.DefaultBeanContext.initializeContext(DefaultBeanContext.java:1595)
    at io.micronaut.context.DefaultApplicationContext.initializeContext(DefaultApplicationContext.java:220)
    at io.micronaut.context.DefaultBeanContext.readAllBeanDeFinitionClasses(DefaultBeanContext.java:2780)
    at io.micronaut.context.DefaultBeanContext.start(DefaultBeanContext.java:233)
    at io.micronaut.context.DefaultApplicationContext.start(DefaultApplicationContext.java:166)
    at io.micronaut.test.extensions.AbstractMicronautExtension.startApplicationContext(AbstractMicronautExtension.java:326)
    at io.micronaut.test.extensions.AbstractMicronautExtension.beforeClass(AbstractMicronautExtension.java:226)
    at io.micronaut.test.extensions.junit5.Micronautjunit5Extension.beforeAll(Micronautjunit5Extension.java:61)
    at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$invokeBeforeAllCallbacks$8(ClassBasedTestDescriptor.java:368)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
    at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.invokeBeforeAllCallbacks(ClassBasedTestDescriptor.java:368)
    at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.before(ClassBasedTestDescriptor.java:192)
    at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.before(ClassBasedTestDescriptor.java:78)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:136)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129)
    at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)
    at java.base/java.util.ArrayList.forEach(ArrayList.java:1541)

我曾尝试研究此问题，但老实说，我不知道为什么会这样。供参考，这是我的build.gradle文件。

plugins {
    id "com.github.johnrengelman.shadow" version "6.0.0"
    id "io.micronaut.application" version '1.0.5'
    id 'com.diffplug.spotless' version '5.7.0'
    id "org.sonarqube" version "2.7"
    id "jacoco"
    id "com.sourcemuse.mongo" version "1.0.7"
}

mainClassName = "fts.marketing.Application"

version "0.1"
group "fts.marketing"

distTar.enabled = false
distZip.enabled = false

repositories {
    mavenCentral()
    jcenter()
}

micronaut {
    runtime "netty"
    testRuntime "junit5"
    processing {
        incremental true
        annotations "fts.marketing.*"
    }
}

dependencies {
    implementation("io.micronaut:micronaut-validation")
    implementation("io.micronaut:micronaut-runtime")
    implementation("javax.annotation:javax.annotation-api")
    implementation("io.micronaut:micronaut-http-client")
    implementation("io.micronaut.mongodb:micronaut-mongo-sync")
    implementation("org.mongodb:mongo-java-driver:3.12.7")
    implementation("io.micronaut.kafka:micronaut-kafka")
    runtimeOnly("ch.qos.logback:logback-classic")
    implementation("org.apache.commons:commons-collections4:4.4")
    implementation("org.apache.commons:commons-lang3:3.9")
    implementation("com.fasterxml.jackson.datatype:jackson-datatype-jsr310:2.9.9")
    implementation("ch.qos.logback.contrib:logback-jackson:0.1.5")
    implementation("ch.qos.logback.contrib:logback-json-classic:0.1.5")
    implementation("org.codehaus.janino:janino:3.1.0")

    // LOMBOK
    compileOnly("org.projectlombok:lombok:1.18.16")
    annotationProcessor("org.projectlombok:lombok:1.18.16")

    //TEST DEPENDENCIES
    testImplementation("org.apache.kafka:kafka-clients:2.3.0:test")
    testImplementation("org.apache.kafka:kafka_2.12:2.3.0")
    testImplementation("org.apache.kafka:kafka_2.12:2.3.0:test")
    testImplementation("org.mockito:mockito-core:3.6.0")
    testImplementation("org.mockito:mockito-junit-jupiter:3.6.0")

}

我正在使用Lombok（最新版本）以及所有mn实用工具创建的东西。任何帮助将不胜感激。

解决方法

事实证明，问题源于我用来手动创建和配置MongoClientFactory的此类MongoClient。为了能够配置Mongo编解码器，在1.3.x版中需要此功能。

不再需要此操作，因为在更高版本中已解决了为Mongo同步驱动程序注册自定义编解码器的行为。

只需删除此类并用@Singleton注释各种编解码器即可解决此问题。

java java micronaut mongodb mongodb