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java.lang.NullPointerException: 	at com.mysql.jdbc.PreparedStatement.asSql(PreparedStatement.java:586)	at com.mysql.jdbc.PreparedStatement.asSql(PreparedStatement.java:524)	at com.mysql.jdbc.PreparedStatement.toString(PreparedStatement.java:3551)	at java.lang.String.valueOf(Unknown Source)	at java.lang.StringBuffer.append(Unknown Source)	at com.mysql.jdbc.trace.Tracer.printParameters(Tracer.aj:240)	at com.mysql.jdbc.trace.Tracer.printEntering(Tracer.aj:167)	at com.mysql.jdbc.trace.Tracer.entry(Tracer.aj:126)	at com.mysql.jdbc.trace.Tracer.ajc$before$com_mysql_jdbc_trace_Tracer$1$f51c62b8(Tracer.aj:45)	at com.mysql.jdbc.Connection.registerStatement(Connection.java)	at com.mysql.jdbc.Statement.(Statement.java:197)	at com.mysql.jdbc.PreparedStatement.(PreparedStatement.java:442)	at com.mysql.jdbc.ServerPreparedStatement.asSql(ServerPreparedStatement.java:347)	at com.mysql.jdbc.PreparedStatement.asSql(PreparedStatement.java:524)	at com.mysql.jdbc.ServerPreparedStatement.toString(ServerPreparedStatement.java:2327)	at java.lang.String.valueOf(Unknown Source)	at java.lang.StringBuffer.append(Unknown Source)	at com.mysql.jdbc.trace.Tracer.printParameters(Tracer.aj:240)	at com.mysql.jdbc.trace.Tracer.printEntering(Tracer.aj:167)	at com.mysql.jdbc.trace.Tracer.entry(Tracer.aj:126)	at com.mysql.jdbc.trace.Tracer.ajc$before$com_mysql_jdbc_trace_Tracer$1$f51c62b8(Tracer.aj:45)	at com.mysql.jdbc.Connection.registerStatement(Connection.java)	at com.mysql.jdbc.Statement.(Statement.java:197)	at com.mysql.jdbc.PreparedStatement.(PreparedStatement.java:423)	at com.mysql.jdbc.ServerPreparedStatement.(ServerPreparedStatement.java:280)	at com.mysql.jdbc.Connection.prepareStatement(Connection.java:4363)	at com.mysql.jdbc.Connection.prepareStatement(Connection.java:4301)	at com.tutorialspoint.JDBCBatchUpdateExample.batchInsertRecordsIntoTable(JDBCBatchUpdateExample.java:49)	at com.tutorialspoint.JDBCBatchUpdateExample.main(JDBCBatchUpdateExample.java:29)