(8条消息) java.lang.NoClassDefFoundError: org/apache/flink/streaming/api/datastream/DataStream

在学习flink是出现以下错误：

java.lang.NoClassDefFoundError: org/apache/flink/streaming/api/datastream/DataStream
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
at java.lang.Class.privateGetMethodRecursive(Class.java:3048)
at java.lang.Class.getMethod0(Class.java:3018)
at java.lang.Class.getMethod(Class.java:1784)
at sun.launcher.LauncherHelper.validateMainClass(LauncherHelper.java:544)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:526)
Caused by: java.lang.ClassNotFoundException: org.apache.flink.streaming.api.datastream.DataStream
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 7 more

原因是：没有导入flink 的lib下的jar包

解决方案：

指定到lib文件下就可以啦

我的pom文件

       <dependency>
           <groupId>org.apache.flink</groupId>
           <artifactId>flink-core</artifactId>
           <version>1.3.1</version>
       </dependency>

       <!-- https://mvnrepository.com/artifact/org.apache.flink/flink-java -->
       <dependency>
           <groupId>org.apache.flink</groupId>
           <artifactId>flink-java</artifactId>
           <version>1.3.1</version>
       </dependency>

       <!-- https://mvnrepository.com/artifact/org.apache.flink/flink-streaming-java -->
       <dependency>
           <groupId>org.apache.flink</groupId>
           <artifactId>flink-streaming-java_2.11</artifactId>
           <version>1.3.1</version>
           <scope>provided</scope>
       </dependency>

       <dependency>
           <groupId>org.apache.flink</groupId>
           <artifactId>flink-connector-kafka-0.9_2.10</artifactId>
           <version>1.0.3-hadoop1</version>
       </dependency>
       <!-- https://mvnrepository.com/artifact/org.apache.flink/flink-clients -->
       <dependency>
           <groupId>org.apache.flink</groupId>
           <artifactId>flink-clients_2.11</artifactId>
           <version>1.3.1</version>
       </dependency>
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