Flink 1.9.0 Error: A JNI error has occurred, please check your installation and try again

僅供和我一樣的小白閱讀，大牛請略過！

今天趟 Flink 19.0 遇到了一個官網的坑：官網可能默認每一位開發者都非常熟悉 Maven 但是今天我這個小白實實在在的躺了次坑：

java.lang.NoClassDefFoundError: org/apache/flink/table/descriptors/ConnectorDescriptor
	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.table.descriptors.ConnectorDescriptor
	at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	... 7 more
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" 

這個報錯實際上是 pom 文件的問題。

官網上的 pom 依賴：

<!-- Either... -->
<dependency>
  <groupId>org.apache.flink</groupId>
  <artifactId>flink-table-api-java-bridge_2.11</artifactId>
  <version>1.9.0</version>
  <scope>provided</scope>
</dependency>
<!-- or... -->
<dependency>
  <groupId>org.apache.flink</groupId>
  <artifactId>flink-table-api-scala-bridge_2.11</artifactId>
  <version>1.9.0</version>
  <scope>provided</scope>
</dependency>
<!-- Either... (for the old planner that was available before Flink 1.9) -->
<dependency>
  <groupId>org.apache.flink</groupId>
  <artifactId>flink-table-planner_2.11</artifactId>
  <version>1.9.0</version>
  <scope>provided</scope>
</dependency>
<!-- or.. (for the new Blink planner) -->
<dependency>
  <groupId>org.apache.flink</groupId>
  <artifactId>flink-table-planner-blink_2.11</artifactId>
  <version>1.9.0</version>
  <scope>provided</scope>
</dependency>
<dependency>
  <groupId>org.apache.flink</groupId>
  <artifactId>flink-streaming-scala_2.11</artifactId>
  <version>1.9.0</version>
  <scope>provided</scope>
</dependency>
<dependency>
  <groupId>org.apache.flink</groupId>
  <artifactId>flink-table-common</artifactId>
  <version>1.9.0</version>
  <scope>provided</scope>
</dependency>

這個錯誤其實就是 ：

<scope>provided</scope>

這個範圍設置造成的。

解決方案：

1： 直接將全部的這個屬性註釋掉，打包需要的時候在解開。

2：更換生效範圍。

3：在<profiles> <profile> 中 <dependencies> 中添加全部的 <scope>provided</scope> 屬性的依賴，並將本屬性修改爲：<scope>compile</scope> 。