I was doing load balancing using two OFBiz servers in Session Replication
mode with Apache HTTP Server.
Servers run properly in load balanced mode, If I shut down one server in
the middle of browser session, the other OFBiz server continues the
browser session without any problem. User login information also persistes
in the session, so the second server does not ask for login again. But
when I go for placing the order, and close the server in middle of the
check out process, rest all the details persist but cart comes out to be
empty , and if there is some promotional item present in the cart, that
promotional item persists inside the cart when second server continues
browser session but all the other items get removed.
And I was getting this exception :
2009-10-29 12:06:49,971 (pool-2-thread-6) [ DeltaManager.java:1329:ERROR]
Manager [/ordermgr]: Unable to receive message through TCP channel
java.io.InvalidClassException: org.ofbiz.order.shoppingcart.ShoppingCart;
local class incompatible: stream classdesc serialVersionUID =
326289553356146708, local class serialVersionUID = -202274068516513625
at java.io.ObjectStreamClass.initNonProxy(Unknown Source)
at java.io.ObjectInputStream.readNonProxyDesc(Unknown Source)
at java.io.ObjectInputStream.readClassDesc(Unknown Source)
at java.io.ObjectInputStream.readNonProxyDesc(Unknown Source)
at java.io.ObjectInputStream.readClassDesc(Unknown Source)
at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
at java.io.ObjectInputStream.readObject0(Unknown Source)
at java.io.ObjectInputStream.readObject(Unknown Source)
at javolution.util.FastMap.readObject(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at java.io.ObjectStreamClass.invokeReadObject(Unknown Source)
at java.io.ObjectInputStream.readSerialData(Unknown Source)
at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
at java.io.ObjectInputStream.readObject0(Unknown Source)
at java.io.ObjectInputStream.readObject(Unknown Source)
at
org.apache.catalina.ha.session.DeltaRequest$AttributeInfo.readExternal(DeltaRequest.java:361)
at
org.apache.catalina.ha.session.DeltaRequest.readExternal(DeltaRequest.java:255)
at
org.apache.catalina.ha.session.DeltaManager.deserializeDeltaRequest(DeltaManager.java:619)
at
After some debugging I found that It was problem of DeltaManager, so I
used BackupManager as manager-class and set the value of
apps-distributable="true" and apps-cross-context="true".After these
settings load balancing in replication mode is working properly.
Now my question is that that why we are using DeltaManager as
manager-class in ofbiz-containers.xml ?
Thanks & Regards,
Anil Soni
[email protected]
Tel : 91-22-6795 4324
Mobile : 9930302283
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