ClassNotFoundException：使用 kafka 主题时出现 org.apache.flink.streaming.api.checkpoint.CheckpointNotifier

我正在使用最新的 Flink-1.1.2-Hadoop-27 和 flink-connector-kafka-0.10.2-hadoop1 jar。

Flink消费者如下：

StreamExecutionEnvironment env=StreamExecutionEnvironment.getExecutionEnvironment();
        if (properties == null) {
            properties = new Properties();
            InputStream props = Resources.getResource(KAFKA_CONFIGURATION_FILE).openStream();
            properties.load(props);

            DataStream<String> stream = env.addSource(new FlinkKafkaConsumer082<>(KAFKA_SIP_TOPIC, new SimpleStringSchema() , properties));

以下是我执行后得到的异常：

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/flink/streaming/api/checkpoint/CheckpointNotifier
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at com.bt.oss.voice.main.FlnkConsumer.main(FlnkConsumer.java:50)Caused by: java.lang.ClassNotFoundException: org.apache.flink.streaming.api.checkpoint.CheckpointNotifier
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 25 more

你正在混合版本。 Flink 0.10.2 的 Kafka 消费者无法与 Flink 1.1.2 配合使用。

您应该使用 Flink 1.1.2 提供的 Kafka 连接器并包含以下 Maven 依赖项：

<dependency>
  <groupId>org.apache.flink</groupId>
  <artifactId>flink-connector-kafka-0.8_2.10</artifactId>
  <version>1.1.2</version>
</dependency>

请查看文档 https://ci.apache.org/projects/flink/flink-docs-release-1.1/apis/streaming/connectors/kafka.html了解详情。