记录：471

场景：使用IntelliJ IDEA本地启动调试Flink流计算时，报错一：加载DataStream报错java.lang.ClassNotFoundException。报错二：No ExecutorFactory found to execute the application。

版本：JDK 1.8,flink-1.11.6,IntelliJ IDEA 2021.2.3。

一、解决加载DataStream报错java.lang.ClassNotFoundException

1.前提

在代码工程中已经正确引入flink-streaming-java_2.11-1.11.6.jar，在此jar包存在org.apache.flink.streaming.api.datastream.DataStream类。

2.场景

在执行启动类的main函数时报错。

3.异常信息

java.lang.NoClassDefFoundError: org/apache/flink/streaming/api/datastream/DataStreamat 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.DataStreamat 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
Error: A JNI error has occurred, please check your installation and try again

4.解决：

(1)选择菜单: Run => Edit Configurations...

(2)在 Run/Debug Configurations页面中，点击: Modify options

(3)在菜单列表中勾选: Add dependencies with "Provided" scope to classpath

(4)点击OK确认保存

菜单列表如图一：

二、解决No ExecutorFactory found to execute the application异常

1.异常信息

Exception in thread "main" java.lang.IllegalStateException: No ExecutorFactory found to execute the application.at org.apache.flink.core.execution.DefaultExecutorServiceLoader.getExecutorFactory(DefaultExecutorServiceLoader.java:88)at org.apache.flink.streaming.api.environment.StreamExecutionEnvironment.executeAsync(StreamExecutionEnvironment.java:1764)at org.apache.flink.streaming.api.environment.StreamExecutionEnvironment.execute(StreamExecutionEnvironment.java:1665)at org.apache.flink.streaming.api.environment.LocalStreamEnvironment.execute(LocalStreamEnvironment.java:73)at org.apache.flink.streaming.api.environment.StreamExecutionEnvironment.execute(StreamExecutionEnvironment.java:1651)

2.解决

在代码工程pom.xml中添加依赖。

<dependency><groupId>org.apache.flink</groupId><artifactId>flink-clients_2.11</artifactId><version>1.11.6</version><scope>provided</scope>
</dependency>

以上，感谢。

2023年9月5日