JBoss Cache Issue
We are using jboss cache (Tree cache) to cache our objects in all our products. We are facing a critical issue. After saving an object to the jboss cache using put method and retrieving the object from jboss cache using get method and changing the state of the object, the state of the object inside the jboss cache is also getting modified. According to the jboss cache documentation the state of the object inside the cache should not be modified until I call put method.
I am forwarding a test case
Test Case
------------
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.jboss.cache.PropertyConfigurator;
import org.jboss.cache.TreeCache;
public class TestCache {
public static void main(String[] args) throws Exception{
List l1 = new ArrayList();
List l2 = new ArrayList();
l2.add("One");
l2.add("Two");
l2.add("Three");
l1.add(l2);
TreeCache jbossCache = null;
try {
jbossCache = new TreeCache();
PropertyConfigurator config = new PropertyConfigurator();
config.configure(jbossCache, "C:\\jboss_cache.xml");
jbossCache.startService();
}
catch(Exception ex) {
System.out.println(ex);
}
jbossCache.put("fqn", "ListInList", l1);
System.out .println("l1 : "+l1.hashCode());
List l3 = (List) jbossCache.get("fqn","ListInList");
System.out .println("l3 : "+l3.hashCode());
for (Iterator i = l3.iterator(); i.hasNext(); ){
List l4 = (List) i.next();
for (Iterator i1 = l4.iterator(); i1.hasNext(); ){
String str = (String) i1.next();
System.out .println(str);
}
}
List l5 = (List)l3.get(0);
l5.remove(1);
List l6 = (List) jbossCache.get("fqn","ListInList");
System.out .println("l6 : "+l6.hashCode());
for (Iterator i2 = l6.iterator(); i2.hasNext(); ){
List l7 = (List) i2.next();
for (Iterator i3 = l7.iterator(); i3.hasNext(); ){
String str = (String) i3.next();
System.out .println(str);
}
}
}
}
Configuration File
---------------------
<?xml version="1.0" encoding="UTF-8"?>
<!-- ===================================================================== -->
<!-- -->
<!-- ECMF Base TreeCache Service Configuration -->
<!-- -->
<!-- ===================================================================== -->
<!-- ==================================================================== -->
<!-- Defines TreeCache configuration -->
<!-- ==================================================================== -->
jboss:service=Naming
jboss:service=TransactionManager
<!--
Configure the TransactionManager
-->
org.jboss.cache.GenericTransactionManagerLookup
<!--
Node locking scheme:
OPTIMISTIC
PESSIMISTIC (default)
-->
PESSIMISTIC
<!--
Note that this attribute is IGNORED if your NodeLockingScheme above is OPTIMISTIC.
Isolation level : SERIALIZABLE
REPEATABLE_READ (default)
READ_COMMITTED
READ_UNCOMMITTED
NONE
-->
READ_COMMITTED
<!--
Valid modes are LOCAL
REPL_ASYNC
REPL_SYNC
INVALIDATION_ASYNC
INVALIDATION_SYNC
-->
REPL_SYNC
<!--
Just used for async repl: use a replication queue
-->
false
<!--
Replication interval for replication queue (in ms)
-->
0
<!--
Max number of elements which trigger replication
-->
0
<!-- Name of cluster. Needs to be the same for all clusters, in order
to find each other
-->
@cache_cluster_name@
<!-- JGroups protocol stack properties. Can also be a URL,
e.g. file:/home/bela/default.xml
-->
<!-- UDP: if you have a multihomed machine,
set the bind_addr attribute to the appropriate NIC IP address, e.g bind_addr="192.168.0.2"
-->
<!-- UDP: On Windows machines, because of the media sense feature
being broken with multicast (even after disabling media sense)
set the loopback attribute to true -->
<UDP mcast_addr="228.1.2.3" mcast_port="48866" ip_ttl="64"
ip_mcast="true" mcast_send_buf_size="150000"
mcast_recv_buf_size="80000" ucast_send_buf_size="150000"
ucast_recv_buf_size="80000" loopback="false" />
<PING timeout="2000" num_initial_members="3" up_thread="false"
down_thread="false" />
<MERGE2 min_interval="10000" max_interval="20000" />
<!-- <FD shun="true" up_thread="true" down_thread="true" />-->
<FD_SOCK />
<VERIFY_SUSPECT timeout="1500" up_thread="false"
down_thread="false" />
<pbcast.NAKACK gc_lag="50"
retransmit_timeout="600,1200,2400,4800" max_xmit_size="8192"
up_thread="false" down_thread="false" />
<UNICAST timeout="600,1200,2400" window_size="100"
min_threshold="10" down_thread="false" />
<pbcast.STABLE desired_avg_gossip="20000" up_thread="false"
down_thread="false" />
<FRAG frag_size="8192" down_thread="false" up_thread="false" />
<pbcast.GMS join_timeout="5000" join_retry_timeout="2000"
shun="true" print_local_addr="true" />
<pbcast.STATE_TRANSFER up_thread="true" down_thread="true" />
<!--
Whether or not to fetch state on joining a cluster
NOTE this used to be called FetchStateOnStartup and has been renamed to be more descriptive.
-->
true
<!--
The max amount of time (in milliseconds) we wait until the
initial state (ie. the contents of the cache) are retrieved from
existing members in a clustered environment
-->
20000
<!--
Number of milliseconds to wait until all responses for a
synchronous call have been received.
-->
20000
<!-- Max number of milliseconds to wait for a lock acquisition -->
150
<!-- Name of the eviction policy class. -->
org.jboss.cache.eviction.LRUPolicy
<!-- Specific eviction policy configurations. This is LRU -->
5
<!-- Cache wide default -->
5000
1000
5000
1000
5
4
<!--
Indicate whether to use region based marshalling or not. Set this to true if you are running under a scoped
class loader, e.g., inside an application server. Default is "false".
-->
false
<!-- Uncomment to get a graphical view of the TreeCache MBean above -->
<!-- -->
<!-- jboss.cache:service=TreeCache-->
<!-- jboss.cache:service=TreeCache-->
<!-- -->
Can you please give us any solution / suggestion?
--Rahul
