我正在尝试在intellij中运行一个项目,每次运行特定的类时,都会收到以下错误消息:
*Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/spark/streaming/StreamingContext
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.spark.streaming.StreamingContext
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)**
答案 0 :(得分:0)
您必须使用spark版本将spark-streaming依赖项添加到SBT中:
libraryDependencies + =“ org.apache.spark” %%“ spark-streaming”%“您的Spark版本”
答案 1 :(得分:0)
很长时间以来,我都面临着相同的问题,我的代码在执行以下行时引发了相同的错误:
val ssc = new StreamingContext(sc, Seconds(10))
我的POM.xml看起来像这样:
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-streaming_2.11</artifactId>
<version>2.3.4</version>
<scope>provided</scope>
</dependency>
您看到另外的行<scope>
吗?一旦我从POM文件中删除了该行,代码便回到了正确的轨道,并成功执行了。
因此,请确保从<scope>
中删除dependency
。
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-streaming_2.11</artifactId>
<version>2.3.4</version>
</dependency>