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/[email protected]: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/[email protected]: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}
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