Storing a Blob into MySql from a JTextArea

I'm using Java 1.4.1, MySql 4.0.12, and MyConnector/J 3.06
I have an application with a JTextArea and I want to put the contents of the JTextArea into the database stored as a Blob Object. The only reason I'm using Blob is because varchar is limited in lenght by 255 characters.
The problem I am having is actually creating the Blob Object. I get a null pointer exception no matter what I do.(Even when there is text in the JTextArea) Please take a look at my code and please help me out if you can.
I'm not sure if I'm using the java Blob correctly as it cannot be instantiated and it's an interface not a class.
Please give me any suggestions including if there is a better way to doing this without using a Blob object. Thanks in advance.
// create a new Blob Object, must initialize to something
Blob tempBlob = null;
// viewOrdData.notes is the JTextArea
if (viewOrdData.notes.getText().length() > 0) {
// THIS IS THE LINE WHERE I GET THE NULL POINTER EXCEPTION
// I tried initial position both 0 and 1
tempBlob.setBytes(0,viewOrdData.notes.getText().getBytes())
stmt.executeUpdate(
"UPDATE WORKORDER "+
"SET NOTES = "+tempBlob+" "+ // NOTES is of type Blob
"WHERE WRKID = "+viewOrdData.workOrderID); // primary key

Now, Storing a Blob into Database from a JTextArea or any text components becomes easy with the SerialBlob class( javax.sql.rowset.serial.SerialBlob - JDK 1.5).
For eg..
For Storing a Blob to Database
pstmt.setBlob(1,new SerialBlob(jtextArea.getText().getBytes()));For Retrieving a Blob to JTextArea
SerialBlob sblob = new SerialBlob(rs.getBlob("FieldName"));
jTextArea.setText(new String(sblob.getBytes(1, (int)sblob.length())));Hope this serves this problem well.
Regards,
R.Amirdha Gopal.

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