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From Pid <...@pidster.com>
Subject Re: MISC; After one Tomcat Cluster node shutdown Session Replication working but a Hashmap object is getting empty
Date Mon, 02 Nov 2009 18:29:37 GMT
On 02/11/2009 17:33, Imad Hachem wrote:
> Dear chris,
>
> Thanks for your reply.
>
> You are right about the case of Tomcat Node non shutdown, HashMap is not
> replicated correctly to the other node.
>
> Note that I am saving a secretKey (javax.crypto.SecretKey) as a VALUE
> for the sessionid KEY stored in the HashMap.
>
> How can I make sure that this secretKey or all HaspMap data are
> serializable?
>
> Note I am using the below code to store in the HashMap:
>
> 	static HashMap userSessionMapArray = new HashMap();
> 	SecretKey  	b =
> KeyGenerator.getInstance("DESede").generateKey();
> 	QueryCryptUser  qcu = new QueryCryptUser(sessionID, b);
> 	userSessionMapArray.put(sessionID, qcu);

Why is the HashMap static?
I don't think the code above will cause anything to replicate.

> Note that I have tried to create the "QueryCryptUser" Class to
> implements java.io.Serializable but still facing the same problem and
> HashMap not replicated to the 2nd Node.

Are you storing the QueryCryptUser, or the HashMap in an HTTPSession 
somewhere else?

What is it that you are actually trying to achieve?


p


> Imad Hachem | Asst.Product Development Manager
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> Path Solutions
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>
> -----Original Message-----
> From: Christopher Schultz [mailto:chris@christopherschultz.net]
> Sent: Monday, November 02, 2009 5:18 PM
> To: Tomcat Users List
> Subject: Re: MISC; After one Tomcat Cluster node shutdown Session
> Replication working but a Hashmap object is getting empty
>
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Imad,
>
> On 11/1/2009 1:41 AM, Imad Hachem wrote:
>> After setting a Tomcat Cluster of 2 nodes on separate machine, Session
>> replication is working very fine except one library objects
>> (QueryCrypt.jar included in this Web Project) having a Hashmap where
> we
>> store Users SESSION ID.
>>
>> After one node shutdown, this Hashmap object is getting empty, note
> that
>> all other session variables have been replicated successfully and
>> SESSIONID.jvmRoute still the same which is correct and expected
>> behavior.
>
> If that node does /not/ shut down, can you observe that the HashMap is
> correctly replicated to the other node? I suspect not.
>
> My guess is that your HashMap has data other than just the SESSIONID,
> and that data is not serializable.
>
> Can you run this code against your HashMap in the session?
>
> Map map = (Map)session.getAttribute("whatever");
>
> for(Iterator i=map.entrySet().iterator(); i.hasNext(); )
> {
>    Map.Entry entry = (Map.Entry)i;
>
>    Object key = entry.getKey();
>    Object value = entry.getValue();
>
>    System.out.print(key);
>    System.out.print(" (");
>    System.out.print((null == key ? "null" : key.getClass().getName()));
>    System.out.print(") ->  ");
>
>    System.out.print(value);
>    System.out.print(" (");
>    System.out.print((null == value
>                      ? "null"
>                      : value.getClass().getName()));
>    System.out.println(")");
> }
>
> - -chris
> -----BEGIN PGP SIGNATURE-----
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>
> iEYEARECAAYFAkru+DcACgkQ9CaO5/Lv0PAfgACbB7Vu9eKS/9rrfhYxqoBcKnv+
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> =Vz81
> -----END PGP SIGNATURE-----
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