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java.lang.NullPointerException: 	at org.apache.spark.sql.execution.datasources.jdbc.JDBCRDD$.resolveTable(JDBCRDD.scala:158)	at org.apache.spark.sql.execution.datasources.jdbc.JDBCRelation.(JDBCRelation.scala:117)	at org.apache.spark.sql.DataFrameReader.jdbc(DataFrameReader.scala:237)	at org.apache.spark.sql.DataFrameReader.jdbc(DataFrameReader.scala:159)	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 py4j.reflection.MethodInvoker.invoke(MethodInvoker.java:237)	at py4j.reflection.ReflectionEngine.invoke(ReflectionEngine.java:357)	at py4j.Gateway.invoke(Gateway.java:280)	at py4j.commands.AbstractCommand.invokeMethod(AbstractCommand.java:128)	at py4j.commands.CallCommand.execute(CallCommand.java:79)	at py4j.GatewayConnection.run(GatewayConnection.java:211)	at java.lang.Thread.run(Thread.java:745)