Can't find postgresql jdbc driver when using external datasource

[JaeSung Jun]

Hi,

I tried to get external data base table running sitting on postgresql.
i've got java.lang.ClassNotFoundException even if i added driver jar using
--jars option like followings :

is it class loader hierarchy problem or any idea?

thanks

-----------------

spark-sql --jars ../lib/postgresql-9.4-1200.jdbc41.jar

spark-sql> CREATE TEMPORARY TABLE uusr

         > USING org.apache.spark.sql.jdbc

         > OPTIONS (

         > url
"jdbc:postgresql://localhost/spark_db?user=postgres&password=password",

         > driver "org.postgresql.Driver",

         > dbtable "uusr"

         > );

..

java.lang.ClassNotFoundException: org.postgresql.Driver

at java.net.URLClassLoader$1.run(URLClassLoader.java:366)

at java.net.URLClassLoader$1.run(URLClassLoader.java:355)

at java.security.AccessController.doPrivileged(Native Method)

at java.net.URLClassLoader.findClass(URLClassLoader.java:354)

at java.lang.ClassLoader.loadClass(ClassLoader.java:425)

at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)

at java.lang.ClassLoader.loadClass(ClassLoader.java:358)

at java.lang.Class.forName0(Native Method)

at java.lang.Class.forName(Class.java:191)

 at
org.apache.spark.sql.jdbc.DefaultSource.createRelation(JDBCRelation.scala:97)

-----------------------------