JPA: Persist binary data (byte array)

Hi,
   when trying to add a field to an entity to hold binary data as a Byte[] (array of objects) NWDS "finds" the following error:
Class with name '[Ljava.lang.Byte;' not found
If the field is of type byte[] (array of primitives):
Class with name '[B' not found
However, according to the JEE Tutorial (page 686), byte array and Byte array are valid types. Is the JPA implementation lacking this feature or am I missing something? Here the field declaration, including the annotations:
     @Column(name="IMPL_BINARY")
     @Lob
     private byte[] implBinary;
Thank you for your help in advance.
Cheers,
Patrik

Looks like you're using JDK 6 and Eclipse/WTP has the issue described [here|http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6500212]. JDK 6 is not supported as runtime yet anyway, so even if you had been able to build your project, it would not run on the server. Therefore, I'd suggest that you switch to JDK 1.5.
HTH!
\-- Vladimir

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Message was edited by:
        yzme yzme
Message was edited by:
        yzme yzme

Hi yzme,
You need to convert the binary data to characters, a String, before you can properly display it. You say that <i>System.err.println(rs.getBytes("MESSAGE").toString());</i> prints human unreadable stuff. Maybe you need to use another character encoding, like this
byte[] message = rs.getBytes("MESSAGE");
String s = new String(message, "UTF-8"); // or "ISO-8859-1"
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| ((value & 0x00ff0000) >> 8)
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your problem? It sounds interesting. Again my simulation could be way
off. (I'm also running this on LV60 for Linux so my results could be
different)
- Kevin
In article <[email protected]>,
"momolxg" wrote:
> Is there a VI for writing binary data to a file without carriage returns
> being inserted every 512 bytes? Thanks

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H:\java_card_kit-2_2_1-win-dom\java_card_kit-2_2_1\samples\src\com\sun\javacard\samples\photocard
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import javax.media.control.*;
import javax.media.protocol.*;
import javax.media.datasink.*;
import javax.media.format.AudioFormat;
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import java.io.*;
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synchronized( waitSync ){
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controllerEvent instanceof PrefetchCompleteEvent ){
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stateTransitionOK = true;
waitSync.notifyAll();
} else if( controllerEvent instanceof ResourceUnavailableEvent ){
synchronized( waitSync ){
stateTransitionOK = false;
waitSync.notifyAll( );
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QueueDataSourceTester tester = new QueueDataSourceTester();
tester.testIt();
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boolean fileSuccess = true;
boolean waitForFileDone(){
synchronized( waitFileSync ){
try{
waitFileSync.wait( 5000 );
catch( Exception e ){
System.err.println( "Error on waiting file to be done" );
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if( dataSinkEvent instanceof EndOfStreamEvent ){
synchronized( waitFileSync ){
fileDone = true;
waitFileSync.notifyAll();
else if ( dataSinkEvent instanceof DataSinkErrorEvent ){
synchronized( waitFileSync ){
fileDone = true;
fileSuccess = false;
waitFileSync.notifyAll();
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* @author wguo
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protected QueueSourceStream streams[];
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printDebug( "QueueDataSource: QueueDataSource( LinkedList) " );
streams = new QueueSourceStream[1];
streams[0] = new QueueSourceStream( source );
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printDebug( "QueueDataSource: connect() " );
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printDebug( "QueueDataSource: disconnect()" );
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return ContentDescriptor.RAW;
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printDebug( "QueueDataSource: getControl(String) " );
return null;
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printDebug( "QueueDataSource: getControls() " );
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return DURATION_UNKNOWN;
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printDebug( "QueueDataSource: stop() " );
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printDebug( "QueueSourceStream:getControl( String) " );
return null;
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printDebug( "QueueSourceStream:getControls()" );
return new Object[0];
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printDebug( "QueueSourceStream:getFormat()" );
return audioFormat;
public void read(javax.media.Buffer buffer) throws java.io.IOException {
buffer.setData( (byte[])sourceQueue.removeFirst() );
buffer.setOffset( 0 );
buffer.setLength( 1024 );
buffer.setFormat( audioFormat );
printDebug( "QueueSourceStream: read( Buffer ) " );
else {
buffer.setEOM( true );
buffer.setOffset( 0 );
buffer.setLength( 0 );
ended = true;
System.out.println( "Done reading byte array" );
return;
public boolean willReadBlock() {
printDebug( "QueueSourceStream: willReadBlock()" );
if( myQueue.isEmpty() )
return true;
else
return false;
private void printDebug( String methodInfo ){
System.out.println( methodInfo + " is called. " );

Truncate byte array of UTF-8 characters without corrupting the data?

Hi all,
I need to be able to determine if the byte array, which is truncated from the original byte array representing UTF-8 string, contains corrupted character. Knowing if the byte array contains corrupted character allows me to remove it from the truncated array.
As in the sample code below, when truncate the string with 16 bytes it displays ok. However, truncate with 17 bytes, the last character is corrupted. Is there a way to check to see if the character is corrupted so that it can be removed from the truncated byte array?
Thanks in advance,
Phuong
PS: The Japanese characters I chose it randomly from Unicode charts. I don't know their meaning so if it is offensive, please forgive me.
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.UnsupportedEncodingException;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.SwingUtilities;
public class TestTruncateUTF8 extends JFrame
    private static final long serialVersionUID = 1L;
    private JTextArea textArea = new JTextArea(5,20);
    private JLabel japanese = new JLabel("Japanese: " + "\u65e5\u672c\u3041\u3086\u308c\u306e");
     * @param args
    public static void main(String[] args)
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run()
                JFrame frame = new TestTruncateUTF8();
                frame.setVisible(true);
    public TestTruncateUTF8()
        super("Test Truncated");
        JButton truncate17Button = new JButton("Truncate 17 bytes");
        truncate17Button.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e)
                truncates(17);
        JButton truncate16Button = new JButton("Truncate 16 bytes");
        truncate16Button.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e)
                truncates(16);
        JPanel panel1 = new JPanel();
        panel1.setLayout(new BoxLayout(panel1, BoxLayout.Y_AXIS));
        panel1.add(japanese);
        panel1.add(truncate16Button);
        panel1.add(truncate17Button);
        panel1.add(new JScrollPane(textArea));
        this.setLayout(new BorderLayout());
        this.add(panel1, BorderLayout.CENTER);
        this.pack();
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    private void truncates(int numOfBytesToTruncate)
        try
            byte[] bytes = japanese.getText().getBytes("UTF-8");
            byte[] newBytes = new byte[numOfBytesToTruncate];
            System.arraycopy(bytes, 0, newBytes, 0, numOfBytesToTruncate);
            TestTruncateUTF8.this.putTextInsideJTextArea(bytes, newBytes);
        catch (UnsupportedEncodingException e1)
            e1.printStackTrace();
    private void putTextInsideJTextArea(byte[] original, byte[] truncated)
        try
            textArea.append("\nOriginal String: " + new String(original, "UTF-8"));
            textArea.append("\nTruncated String: " + new String(truncated, "UTF-8"));
            textArea.append("\n*****************************\n");
        catch (UnsupportedEncodingException e)
            e.printStackTrace();
}

Since the byte array is in UTF-8, you can easily examine whether it is corrupt or not by taking a look at the last 4 bytes (at most). That is because the bit distribution of each byte (1st, 2nd, 3rd, and 4th) in UTF-8 encoding is well defined in its spec.
BTW, a Japanese Hiragana/Kanji character typically has 3 bytes in UTF-8, so truncating with neither 16 nor 17 bytes would produce correct truncation.
HTH,
Naoto

How to load and display a byte array (jpeg) image file dynamically in Flex?

My web service client (servlet) received a binary jpeg data from an Image Server. The Flex application invokes the
servlet via HttpService and receives the binary jpeg data as byte array. How could it be displayed dynamically
without writing the byte array to a jpeg file? Please help (some sample code is very much appreciated).

JPEGEncoder is only useful for converting BitmapData to ByteArray, not the other way around.
By the way JPEGEncoder and PNGEncoder are part of the Flex SDK now, so no need to use AS3Lib (alltough it's a good library to have around).
To display/use a ByteArray as image, use a Loader instance with the loadBytes method.
    Loader.loadBytes(bytes:ByteArray, context:LoaderContext = null);
Listen for the complete event on the Loader.contentLoaderInfo and get the BitmapData in the event handler.
private function loadJpeg():void {
    var loader:Loader = new Loader();
    loader.contentLoaderInfo.addEventListener(Event.COMPLETE, loaderCompleteHandler);
    //jpgBA is the ByteArray loaded from webservice
    loader.loadBytes(jpgBA);
private function loaderCompleteHandler(evt:Event):void {
    var t:LoaderInfo = evt.currentTarget as LoaderInfo;
    // display the jpeg in an Image component
    img.source = t.content;
<mx:Image id="img" scaleContent="false" />

JPA: Persist binary data (byte array)

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