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我想將Java文件編譯爲jar。我希望它可以由Spark運行。我確實試圖正常編譯,但它有這樣的錯誤。如何爲Spark編譯Java?
java.lang.NoClassDefFoundError: JavaWordCount (wrong name: org/apache/spark/examples/JavaWordCount)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at org.apache.spark.util.Utils$.classForName(Utils.scala:229)
at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:700)
at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:187)
at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:212)
at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:126)
at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
這就是我編譯Java的方式。
javac -classpath spark-sql_2.11-2.1.1.jar:spark-core_2.11-2.1.1.jar:scala-compiler-2.11.8.jar:scala-library-2.11.8.jar JavaWordCount.java
這就是如何使jar文件
jar cvf JavaWordCount.jar JavaWordCount*.class
但是做這樣的上面,當我試圖火花提交錯誤上來。
spark-submit --class JavaWordCount JavaWordCount.jar README.md
我也沒有試圖改變全班分成org.apache.spark.examples.JavaWordCount但它仍然給了我同樣的錯誤。
我哪裏錯了?任何建議? PS我在Spark文件夾中使用了一個示例JavaWordCount。