Losing servlet-ldap connection

Question

Hi,
The problem :
I have a servlet that accesses an Ldap server (iplanet). The servlet loses the ldap connection after being unsused for a long while.
What I tried :
I implemented my own method (isConnected(), see the code below) to check the connection : this method performs a silly search in the Ldap. I call this method before any other call to the Ldap. When the connection is lost, the method hangs for a long while (more than 5 minutes) although I set the serverTimeLimit parameter to 10 seconds. The servlet is hanging during the call to the search method of the Ldap.
The question :
Do you know the ways to check if the ldap connection is still valid or not ?
The details :
Environment : Unix, Solaris 8
Tomcat server 4.1
Iplanet 5.1
Ldap access : SDK
The code :
* isConnected()
* Test the Ldap connection trying to perform a search request
* @author mba
* @version
public boolean isConnected()
boolean zb_IsConnected = true;
// Test the connection with a request
try
String lDN = "ObjectName=*";
String lFilter = "(ObjectName=*)";
String lAttrs[] = {"ObjectID"};
mLDAP.getSearchConstraints().setServerTimeLimit(10);
LDAPSearchResults lResults = mLDAP.search (mSwitchDir, LDAPConnection.SCOPE_ONE, lFilter, lAttrs, false);
catch (LDAPException e)
if( (e.getLDAPResultCode() == LDAPException.SERVER_DOWN) ||
(e.getLDAPResultCode() == LDAPException.CONNECT_ERROR) ||
(e.getLDAPResultCode() == LDAPException.CONNECT_ERROR) ||
(e.getLDAPResultCode() == LDAPException.TIME_LIMIT_EXCEEDED) ||           
(e.getLDAPResultCode() != LDAPException.SUCCESS) )
if(!reconnect())
System.out.println("ldapMain::isConnected() - Error, failed to reconnect");          
          zb_IsConnected = false;
return zb_IsConnected;
}

Answer 1

Hi All,
I am working on a project which uses jsp and ldap. I am getting a very strange kind of error, sometimes for LDAP operation error called SERVER_DOWN(80) is coming it it goes if I refresh the page. behaviour of this error is very uncertain sometimes it comes and sometimes it does not come.
Does anybody has any idea how to solve? is it something related to LDAP server settings or memory leaks. please guide
thanks in advance
-presi