I have an application which stores PDF documents in a longblob column of a MySQL 5 table. A standalone Java application writes to the table and persists the documents to the table. The documents can be downloaded via a web application. The code to retrieve the documents is straight forward: ... rs = stmt.executeQuery(); if (rs.next()) { Blob blob = rs.getBlob(1); InputStream in = blob.getBinaryStream(); } The code works in Tomcat 5 but in JBoss 4.0.2 the call to rs.getBlob(1) throws the following exception: java.lang.reflect.UndeclaredThrowableException at $Proxy77.getBlob(Unknown Source) Caused by: java.lang.IllegalAccessException: Method=public abstract java.sql.Blob java.sql.ResultSet.getBlob(int) throws java.sql.SQLException does not return Serializable ... .. Replacing rs.getBlob(1) with rs.getBinaryStream(1) also throws the same exception. This problem and a few other JDBC related problems are beginning to raise a lot of doubts in my head about JBoss. The application works on Geronimo and Tomcat, but I hate Geronimo and Tomcat has no EJB container. Help! View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3962693#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...