[jira] [Created] (CASSANDRA-2734) NPE running res.next() for a select statement

[Cathy Daw (JIRA)]

NPE running res.next() for a select statement
---------------------------------------------

                 Key: CASSANDRA-2734
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2734
             Project: Cassandra
          Issue Type: Bug
    Affects Versions: 0.8.0 beta 2
            Reporter: Cathy Daw
            Priority: Minor


*The following statement fails when used with a Statement or PreparedStatement*
{code}
res = stmt.executeQuery("SELECT bar FROM users");  
res.next();
{code}

*Error Message*
{code}
    [junit] Testcase: simpleSelect(com.datastax.cql.reproBugTest):      Caused 
an ERROR
    [junit] null
    [junit] java.lang.NullPointerException
    [junit]     at 
org.apache.cassandra.cql.jdbc.ColumnDecoder.makeKeyColumn(ColumnDecoder.java:136)
    [junit]     at 
org.apache.cassandra.cql.jdbc.CResultSet.next(CResultSet.java:388)
    [junit]     at 
com.datastax.cql.reproBugTest.simpleSelect(reproBugTest.java:57)
    [junit] 
    [junit] 
    [junit] Test com.datastax.cql.reproBugTest FAILED
{code}


*Here is a quick repro.  Showing that res.next() works with other statements 
but not select.  I noticed in the existing driver tests similar test cases, so 
not sure the issue.*
* you will need to drop this in your test directory
* change the package declaration
* ant test -Dtest.name=reproBugTest

{code}
package com.datastax.cql;

import java.sql.DriverManager;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import org.junit.Test;

public class reproBugTest {
    
    @Test
    public void simpleSelect() throws Exception {   
        Connection connection = null;
        ResultSet res;
        Statement stmt;
        
        try {
            Class.forName("org.apache.cassandra.cql.jdbc.CassandraDriver");
            
            // Check create keyspace
            connection = 
DriverManager.getConnection("jdbc:cassandra:root/root@127.0.0.1:9160/default"); 
    
            stmt = connection.createStatement();

            try {
              System.out.println("Running DROP KS Statement");  
              res = stmt.executeQuery("DROP KEYSPACE ks1");  
              res.next();
              
              System.out.println("Running CREATE KS Statement");
              res = stmt.executeQuery("CREATE KEYSPACE ks1 with strategy_class 
=  'org.apache.cassandra.locator.SimpleStrategy' and 
strategy_options:replication_factor=1");  
              res.next();

            } catch (SQLException e) {
                if (e.getMessage().startsWith("Keyspace does not exist")) 
                {
                    res = stmt.executeQuery("CREATE KEYSPACE ks1 with 
strategy_class =  'org.apache.cassandra.locator.SimpleStrategy' and 
strategy_options:replication_factor=1");  
                } 
            }   
            connection.close();    
            
            // Run Test
            connection = 
DriverManager.getConnection("jdbc:cassandra:root/root@127.0.0.1:9160/ks1");     
            stmt = connection.createStatement();

            System.out.println("Running CREATE CF Statement");
            res = stmt.executeQuery("CREATE COLUMNFAMILY users (KEY varchar 
PRIMARY KEY, password varchar, gender varchar, session_token varchar, state 
varchar, birth_year bigint)");    
            res.next();
            
            System.out.println("Running INSERT Statement");
            res = stmt.executeQuery("INSERT INTO users (KEY, password) VALUES 
('user1', 'ch@nge')");  
            res.next();
            
            System.out.println("Running SELECT Statement");
            res = stmt.executeQuery("SELECT bar FROM users");  
            res.next();
                  
            connection.close();               

        } catch (SQLException e) {
            e.printStackTrace();
        }
    }      
}

{code}


--
This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira