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:
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