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From "Imad Hachem" <IHac...@lb.path-solutions.com>
Subject RE: MISC; After one Tomcat Cluster node shutdown Session Replication working but a Hashmap object is getting empty
Date Tue, 03 Nov 2009 04:03:57 GMT
Hi Pid,

Thanks for your reply.

I am using a URL Encrytion/Decryption Open Source Library called
"QueryCrypt", and HaspMap object has been declared in this Library as
Static.

QueryCrypt Library is based on HashMap where it has been used to store
Users SESSIONIDs and Encryption KEYs.


For each user we are inserting an Entry (Key=SESSIONID,
VALUE=Encryption_key) after an encryption Call of One URL String.

After a Decryption Call, QueryCrypt fetch the HashMap table and retrieve
the "Encryption_key" for the related "SESSIONID".

What is happening, the HasMap table is not replicated at all between
Clustered Tomcats, and after Decryption I am loosing and not able to
Retrieve my "Encryption_key" in order to Decrypt my URL String.


Are you suggesting to Store the HashMap and QueryCryptUser objects to
the HTTPSession in order to be retrieved later on or just to store them
on the session to force the HashMap to be replicated?




Imad Hachem | Asst.Product Development Manager
e-Banking Department
Path Solutions
Tel: +961 1 697444 ext. 222
Fax: +961 1 696744
www.path-solutions.com



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-----Original Message-----
From: Pid [mailto:pid@pidster.com] 
Sent: Monday, November 02, 2009 8:30 PM
To: users@tomcat.apache.org
Subject: Re: MISC; After one Tomcat Cluster node shutdown Session
Replication working but a Hashmap object is getting empty

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
> e-Banking Department
> Path Solutions
> Tel: +961 1 697444 ext. 222
> Fax: +961 1 696744
> www.path-solutions.com
>
>
>
> Disclaimer
> [The information contained in this e-mail message and any attached
files
> are confidential information and intended solely for the use of the
> individual or entity to whom they are addressed. This transmission may
> contain information that is privileged, confidential or exempt from
> disclosure under applicable law. If you have received this e-mail in
> error, please notify the sender immediately and delete all copies. If
> you are not the intended recipient, any disclosure, copying,
> distribution, or use of the information contained herein is STRICTLY
> PROHIBITED. Path Solutions accepts no responsibility for any errors,
> omissions, computer viruses and other defects.]
>
>
>
>
> -----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-----
> Version: GnuPG v1.4.10 (MingW32)
> Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/
>
> iEYEARECAAYFAkru+DcACgkQ9CaO5/Lv0PAfgACbB7Vu9eKS/9rrfhYxqoBcKnv+
> ARQAoKFbk70KLHU/dh+0CypVk839V2ku
> =Vz81
> -----END PGP SIGNATURE-----
>
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