loading an image as a BLOB into MySQL using Java

Posted on 2006-07-10
Last Modified: 2008-02-26

I'm trying to load an image as a BLOB into a MySQL database. The database is set up fine, and working correctly. However, when I try to add images to the required table, the Java class throws the following error when I run it from a command line,

Exception in thread "main" java.lang.NoClassDefFoundError: DPToolTesting/LoadImage/java

I run this program with the following command from a terminal,

java DPToolTesting.LoadImage test.jpg 1 "Test Image"

The code for the Java class is as follows,

package DPToolTesting;

import java.sql.*;

public class LoadImage
  public static void main( String[] args )
    if( args.length < 3 )
      System.out.println( "Usage: LoadImage <image-filename> <album-id> <name>" );
      System.exit( 0 );

    String filename = args[ 0 ];
    int albumId = Integer.parseInt( args[ 1 ] );
    String name = args[ 2 ];
    Connection conn = null;
    PreparedStatement ps = null;
      Class.forName( "com.mysql.jdbc.Driver" );
      String url = "jdbc:mysql://localhost/signlists";
      String username = "root";
      String password = "";
      conn = DriverManager.getConnection( url, username, password );
      ps = conn.prepareStatement(
        "INSERT INTO Image (album_id, image_name, image_full) VALUES( ?, ?, ? )" );

      ps.setInt( 1, albumId );
      ps.setString( 2, name );

      // Insert the image into the second Blob
      File image = new File( filename );
      FileInputStream fis = new FileInputStream( image );
      ps.setBinaryStream( 3, fis, ( int )image.length() );

      // Execute the INSERT
      int count = ps.executeUpdate();
      System.out.println( "Rows inserted: " + count );
    catch( Exception e )
        if( ps != null ) ps.close();
        if( conn != null ) conn.close();
      catch( Exception ee )

I've probably missed something obvious, but I can't seem to see where the problem might be.

Any help or advice would be appreciated.

Question by:nhay59
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LVL 86

Accepted Solution

CEHJ earned 500 total points
ID: 17073611
You need to be running from the parent directory of DPToolTesting, or it must be in the classpath


Author Comment

ID: 17074206

I've used 'cd' to change to the parent directory at the terminal, and run the same command. It is still showing the same error,

Exception in thread "main" java.lang.NoClassDefFoundError: DPToolTesting/LoadImage

I really can't see why this error is occurring just because I run it from the terminal.

Any help or advice appreciated.


Author Comment

ID: 17074439

I've solved the above error by moving the file etc to the default home directory and compiling and running from there. I just need to solve the accompanying SQL errors now.

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LVL 23

Expert Comment

ID: 17074468
> I just need to solve the accompanying SQL errors now.
What errors are you getting?

Author Comment

ID: 17074503

Thanks for all the replies. I've now solved the SQL errors as well. Everything is working fine now.

Thanks to all for their help.

LVL 86

Expert Comment

ID: 17076585

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