Spark作业报错ClassNotFoundException
记一次本地跑 spark 作业时报错:
Exception in thread "main" java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
at java.net.URLClassLoader.findClass(URLClassLoader.java:387)
at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
at org.apache.spark.sql.execution.datasources.jdbc.DriverRegistry$.register(DriverRegistry.scala:45)
at org.apache.spark.sql.execution.datasources.jdbc.JDBCOptions$$anonfun$6.apply(JDBCOptions.scala:79)
at org.apache.spark.sql.execution.datasources.jdbc.JDBCOptions$$anonfun$6.apply(JDBCOptions.scala:79)
at scala.Option.foreach(Option.scala:257)
at org.apache.spark.sql.execution.datasources.jdbc.JDBCOptions.(JDBCOptions.scala:79)
at org.apache.spark.sql.execution.datasources.jdbc.JDBCOptions.(JDBCOptions.scala:35)
at org.apache.spark.sql.execution.datasources.jdbc.JdbcRelationProvider.createRelation(JdbcRelationProvider.scala:34)
at org.apache.spark.sql.execution.datasources.DataSource.resolveRelation(DataSource.scala:341)
at org.apache.spark.sql.DataFrameReader.loadV1Source(DataFrameReader.scala:239)
at org.apache.spark.sql.DataFrameReader.load(DataFrameReader.scala:227)
at org.apache.spark.sql.DataFrameReader.load(DataFrameReader.scala:164)
at SparkTest$.main(SparkTest.scala:29)
at SparkTest.main(SparkTest.scala)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.spark.deploy.JavaMainApplication.start(SparkApplication.scala:52)
at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:894)
at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:198)
at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:228)
at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:137)
at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
原因:由于spark运行本地作业脚本启动参数设置问题所引起
解决:
在用spark连接mysql数据库时出现java.lang.ClassNotFoundException: com.mysql.jdbc.Driver报错,可以通过设置–driver-class-path /path/mysql-connector-java-8.0.20.jar来解决
例:
./spark-submit --driver-class-path /home/hadoop/spark/file/mysql-connector-java-8.0.20.jar --class SparkTest /home/hadoop/spark/file/testSpark.jar
后面也可以再加上mysql的连接地址等参数
./spark-submit --driver-class-path /home/hadoop/spark/file/mysql-connector-java-8.0.20.jar --class SparkTest /home/hadoop/spark/file/testSpark.jar jdbc:mysql://127.0.0.1:3306/bd com.mysql.jdbc.Driver users root 123456
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