1、ERROR：No implicits found for parameter evidence$16: TypeInformation[String]
    image.png

    原因是导包错误，无法识别隐式转换
    导入 import org.apache.flink.api.scala._ 即可

    21.报错：

    1. Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/flink/api/scala/typeutils/CaseClassTypeInfo
    2.     at java.lang.ClassLoader.defineClass1(Native Method)
    3.     at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
    4.     at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    5.     at java.net.URLClassLoader.defineClass(URLClassLoader.java:468)
    6.     at java.net.URLClassLoader.access$100(URLClassLoader.java:74)
    7.     at java.net.URLClassLoader$1.run(URLClassLoader.java:369)
    8.     at java.net.URLClassLoader$1.run(URLClassLoader.java:363)
    9.     at java.security.AccessController.doPrivileged(Native Method)
    10.     at java.net.URLClassLoader.findClass(URLClassLoader.java:362)
    11.     at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    12.     at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
    13.     at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    14.     at com.hairuo.flink.streaming.chapter1.AverageSensorReadings.main(AverageSensorReadings.scala)
    15. Caused by: java.lang.ClassNotFoundException: org.apache.flink.api.scala.typeutils.CaseClassTypeInfo
    16.     at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
    17.     at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    18.     at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
    19.     at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    20.     ... 13 more
    21. Process finished with exit code 1

    2.错误分析：主要看这一句
    Exception in thread “main” java.lang.NoClassDefFoundError: org/apache/flink/api/scala/typeutils/CaseClassTypeInfo
    大概意思是找不到类

    3.解决办法：
    修改pom文件中的依赖项

    <dependency>
            <groupId>org.apache.flink</groupId>
            <artifactId>flink-scala_${scala.binary.version}</artifactId>
            <version>${flink.version}</version>
            <scope>provided</scope>
        </dependency>

    去掉scope即可

    <dependency>
            <groupId>org.apache.flink</groupId>
            <artifactId>flink-scala_${scala.binary.version}</artifactId>
            <version>${flink.version}</version>
<!--            <scope>provided</scope>-->
        </dependency>