Problem with inserting two BLOBs into a table using setBinaryStream

Question

DBMS 9.2.0.1.0, Oracle JDBC driver 10.1.0.2.0
The following code insert in one INSERT two BLOBs
into two columns using PreparedStatement.setBinaryStream(). When the size of the of at least one blob exceeds
some limit (? 2k, 4k ?), the values are swapped and
inserted into wrong columns.
Please, is this a problem in JDBC driver?
====================================================
import java.io.ByteArrayInputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.sql.Statement;
* Test - two BLOBs swapped problem.
* If size of the blob is larger that some treshold, they are swapped in the database.
public class BlobSwapTest {
private static Connection getConnection() throws SQLException {
try {
Class.forName("oracle.jdbc.driver.OracleDriver");
} catch (ClassNotFoundException cnfe) {
throw new SQLException("ClassNotFoundException: " + cnfe.getMessage());
return DriverManager.getConnection("jdbc:oracle:thin:@//HOST:1521/DB", "USER", "PSWD");
private static void createTable() throws SQLException {
Connection conn = getConnection();
Statement stmt = null;
try {
stmt = conn.createStatement();
try {
stmt.execute("DROP TABLE BlobTest2");
} catch (SQLException e) {
System.err.println("Table BlobTest2 was not deleted: " + e.getMessage());
stmt.execute(
"CREATE TABLE BlobTest2 ("
+ " pk VARCHAR(512), "
+ " blob BLOB, "
+ " blobB BLOB, "
+ " PRIMARY KEY (pk)"
+ ")"
} finally {
try {
if (stmt != null) stmt.close();
} finally {
conn.close();
public static void main(String[] args) throws SQLException {
createTable();
Connection conn = getConnection();
PreparedStatement pstmt = null;
try {
conn.setAutoCommit(false);
pstmt = conn.prepareStatement("INSERT INTO BlobTest2 VALUES (?,?,?)");
final int size = 5000; // change the value to 500 and the test is OK
byte[] buf = new byte[size];
byte[] buf2 = new byte[size];
for (int i = 0; i < size; i++) {
buf = 66;
buf2 = 88;
pstmt.setString(1, "PK value");
pstmt.setBinaryStream(2, new ByteArrayInputStream(buf), size);
pstmt.setBinaryStream(3, new ByteArrayInputStream(buf2), size);
pstmt.executeUpdate();
conn.commit();
} finally {
if (pstmt != null) pstmt.close();
conn.close();
====================================================

Answer 1

See my response in the JVM forum.