<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<body link="#355491" alink="#4262a1" vlink="#355491" style="background: #e2e2e2; margin: 0; padding: 20px;">
<div>
<table cellpadding="0" bgcolor="#FFFFFF" border="0" cellspacing="0" style="border: 1px solid #dadada; margin-bottom: 30px; width: 100%; -moz-border-radius: 6px; -webkit-border-radius: 6px;">
<tbody>
<tr>
<td>
<table border="0" cellpadding="0" cellspacing="0" bgcolor="#FFFFFF" style="border: solid 2px #ccc; background: #dadada; width: 100%; -moz-border-radius: 6px; -webkit-border-radius: 6px;">
<tbody>
<tr>
<td bgcolor="#000000" valign="middle" height="58px" style="border-bottom: 1px solid #ccc; padding: 20px; -moz-border-radius-topleft: 3px; -moz-border-radius-topright: 3px; -webkit-border-top-right-radius: 5px; -webkit-border-top-left-radius: 5px;">
<h1 style="color: #333333; font: bold 22px Arial, Helvetica, sans-serif; margin: 0; display: block !important;">
<!-- To have a header image/logo replace the name below with your img tag -->
<!-- Email clients will render the images when the message is read so any image -->
<!-- must be made available on a public server, so that all recipients can load the image. -->
<a href="http://community.jboss.org/index.jspa" style="text-decoration: none; color: #E1E1E1">JBoss Community</a></h1>
</td>
</tr>
<tr>
<td bgcolor="#FFFFFF" style="font: normal 12px Arial, Helvetica, sans-serif; color:#333333; padding: 20px; -moz-border-radius-bottomleft: 4px; -moz-border-radius-bottomright: 4px; -webkit-border-bottom-right-radius: 5px; -webkit-border-bottom-left-radius: 5px;"><h3 style="margin: 10px 0 5px; font-size: 17px; font-weight: normal;">
OptionalDataException when retrieving cached session
</h3>
<span style="margin-bottom: 10px;">
created by <a href="http://community.jboss.org/people/kanedk">Dan Kane</a> in <i>JBoss Cache</i> - <a href="http://community.jboss.org/message/591755#591755">View the full discussion</a>
</span>
<hr style="margin: 20px 0; border: none; background-color: #dadada; height: 1px;">
<div class="jive-rendered-content"><p>JBoss AS 4.2.2, JBoss Cache 1.4.1sp5</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>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.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>However, I would like to write a standalone java app that accesses the session data in the JBOSSCACHE table, to inspect/verify it.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>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.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>However, when I try to use an ObjectInputStream to readObject(), I always get an OptionalDataException, which makes no sense.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Code snippet:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><a class="" href="http://community.jboss.org/message/591755#591755">OptionalDataException when retrieving cached session</a></p><p>  JDBCCacheLoader cl = new JDBCCacheLoader();</p><p>      Properties props = new Properties();</p><p>      props.setProperty("cache.jdbc.driver", "com.ibm.db2.jcc.DB2Driver");</p><p>      props.setProperty("cache.jdbc.url", "jdbc:db2:-//host.domain.com");</p><p>      props.setProperty("cache.jdbc.user", "username");</p><p>      props.setProperty("cache.jdbc.password", "password");</p><p>      cl.setConfig(props);</p><p>      try</p><p>      {</p><p>        cl.create();</p><p>        String[] path = new String[] { "JSESSION", "localhost", "ROOT" };</p><p>        Fqn root = new Fqn(path);</p><p>        Set children = cl.getChildrenNames(root);</p><p>        int count = 5;</p><p>        for (Object c : children)</p><p>        {</p><p>          if (count == 0)</p><p>          {</p><p>            break;</p><p>          }</p><p>          count--;</p><p>          if (c instanceof String)</p><p>          {</p><p>            String cStr = root.toString() <em>"/"</em> (String)c;</p><p>            Map m = cl.get(Fqn.fromString(cStr));</p><p>            Object obj = m.get(c);</p><p>            if (obj != null)</p><p>            {</p><p>              InputStream is = new ByteArrayInputStream((byte[])obj);</p><p>              try</p><p>              {</p><p>                ObjectInputStream ois = new ObjectInputStream(is);</p><p>                Object sess = ois.readObject(); // **<strong>OptionalDataException</strong>**</p><p>                sess.hashCode();</p><p>              }</p><p>              catch (Exception ex)</p><p>              {</p><p>                //...</p><p>              }</p><p>            }</p><p>            else</p><p>            {</p><p>              //...</p><p>            }</p><p>          }</p><p>        }</p><p>      }</p><p>      catch (Exception ex)</p><p>      {</p><p>        Logger.getLogger(MainFrame.class.getName()).log(Level.ERROR, null, ex);</p><p>      }</p><p><a class="jive-link-external-small" href="/code">/code</a></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p></div>
<div style="background-color: #f4f4f4; padding: 10px; margin-top: 20px;">
<p style="margin: 0;">Reply to this message by <a href="http://community.jboss.org/message/591755#591755">going to Community</a></p>
<p style="margin: 0;">Start a new discussion in JBoss Cache at <a href="http://community.jboss.org/choose-container!input.jspa?contentType=1&containerType=14&container=2052">Community</a></p>
</div></td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
</div>
</body>
</html>