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  1. MariaDB Connector/J
  2. CONJ-519

Updatable result-set possible NPE when same field is repeated.

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    Description

      When using an updatable resultset (using ResultSet.CONCUR_UPDATABLE), If query concern only one table AND having same field repeat multiple time, getting a value using resultset.getXXX() from one of those repeated field will result in a NPE.

      example : 

              stmt.execute("CREATE TABLE TT ( t1 varchar(50) NOT NULL, t2 varchar(50), PRIMARY KEY (t1))");
      		 
              stmt.execute("insert into tt values ('a', 'b'), ('c', 'd')");
      		 
              PreparedStatement preparedStatement = sharedConnection.prepareStatement("SELECT t1, t2, t1 as t3 FROM TT", ResultSet.FETCH_FORWARD, ResultSet.CONCUR_UPDATABLE);
      		 
              ResultSet rs = preparedStatement.executeQuery();
      		 
              while (rs.next()) {
      		 
                  rs.getObject(3); //will thow an NPE 
              }

      resulting error is : 

      java.lang.NullPointerException
      		 
      	at org.mariadb.jdbc.internal.com.read.resultset.SelectResultSet.getInternalObject(SelectResultSet.java:2099)
      		 
      	at org.mariadb.jdbc.internal.com.read.resultset.SelectResultSet.getObject(SelectResultSet.java:1936)

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            diego dupin Diego Dupin
            diego dupin Diego Dupin
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