Dan Kane [http://community.jboss.org/people/kanedk] created the discussion "OptionalDataException when retrieving cached session" To view the discussion, visit: http://community.jboss.org/message/591755#591755 -------------------------------------------------------------- JBoss AS 4.2.2, JBoss Cache 1.4.1sp5 My appserver uses DB2 as a backend for JBoss Cache to persist sessions. I can kill the appserver, restart it and continue my session just fine - proving that it is storing and retrieving the session correctly. However, I would like to write a standalone java app that accesses the session data in the JBOSSCACHE table, to inspect/verify it. I can use a JDBCCacheLoader to connect to the DB. I create a Fqn and can use it to iterate through its children (the session records). I can even retrieve the byte[] that is supposedly the serialized form of the session object. However, when I try to use an ObjectInputStream to readObject(), I always get an OptionalDataException, which makes no sense. Code snippet: http://community.jboss.org/message/591755#591755 OptionalDataException when retrieving cached session   JDBCCacheLoader cl = new JDBCCacheLoader();       Properties props = new Properties();       props.setProperty("cache.jdbc.driver", "com.ibm.db2.jcc.DB2Driver");       props.setProperty("cache.jdbc.url", "jdbc:db2:-//host.domain.com");       props.setProperty("cache.jdbc.user", "username");       props.setProperty("cache.jdbc.password", "password");       cl.setConfig(props);       try       {         cl.create();         String[] path = new String[] { "JSESSION", "localhost", "ROOT" };         Fqn root = new Fqn(path);         Set children = cl.getChildrenNames(root);         int count = 5;         for (Object c : children)         {           if (count == 0)           {             break;           }           count--;           if (c instanceof String)           {             String cStr = root.toString() +"/"+ (String)c;             Map m = cl.get(Fqn.fromString(cStr));             Object obj = m.get(c);             if (obj != null)             {               InputStream is = new ByteArrayInputStream((byte[])obj);               try               {                 ObjectInputStream ois = new ObjectInputStream(is);                 Object sess = ois.readObject(); // ***OptionalDataException***                 sess.hashCode();               }               catch (Exception ex)               {                 //...               }             }             else             {               //...             }           }         }       }       catch (Exception ex)       {         Logger.getLogger(MainFrame.class.getName()).log(Level.ERROR, null, ex);       } /code /code -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/591755#591755] Start a new discussion in JBoss Cache at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]