kafka.utils.TestUtils.tempDir(TestUtils.scala)：scala/java.lang.NoClassDefFoundError/GenTraversableOnce

Question

在使用@EmbeddedKafka(topics = { "checkins" })时，我得到了一个错误

Caused by: java.lang.NoClassDefFoundError: scala/collection/GenTraversableOnce
    at kafka.utils.TestUtils.tempDir(TestUtils.scala)
    at org.springframework.kafka.test.EmbeddedKafkaBroker$EmbeddedZookeeper.<init>(EmbeddedKafkaBroker.java:738)
    at org.springframework.kafka.test.EmbeddedKafkaBroker.afterPropertiesSet(EmbeddedKafkaBroker.java:291)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1853)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1790)

我使用的是弹簧引导2.3.3。

我的秤看起来就像

            compile("io.confluent:kafka-json-serializer:$confluentJsonVersion")
            compile ("org.apache.kafka:kafka-clients: $kafkaVersion")
            implementation ("org.springframework.boot:spring-boot-starter-validation")
            implementation("org.springframework.kafka:spring-kafak:$springKafkaVersion")
            implementation "org.apache.kafka:kafka-clients:$kafkaVersion"

        testImplementation("org.springframework.kafka:spring-kafka-test:$springKafkaVersion")
        testImplementation("org.apache.kafka:kafka_2.13:$kafkaVersion")
        testImplementation("org.apache.kafka:kafka_2.13:$kafkaVersion:test")
        testImplementation ("org.apache.kafka:kafka-clients:$kafkaVersion:test")

Answer 1

该接口只存在于kafka_2.12 jars中。

似乎您有一个2.12 ...-test jar和一个2.13 kafka jar (这不是您的gradle说的)。

gradle dependencies怎么说？