Clustering wise problem

Question

Hi all
i have an ear application which has been deployed in OC4J application server 10.1.3 in that ear i have one stateless session bean i have created a singleton object in that i am storing registered and online users. it is working fine. but when i deployed in clustering topology some times object is not holding values i observed object we have created is in instance level . in load balancing concept when request is served by another instance then i am unable to get those values which are created by previous instance.
Is there any solution which will fulfill my requirement
please tell any solution
can we create any object that object scope must be container level ( i mean it must be available for all instances )
thanks in advance

Answer 1

Hi, I am deploying my apllication in OCJ instance gruop i.e. in two instances(Clusteing environment). I have 2 applications namely App1 and App2. I m communicating with App2 using App1. Im running the oc4j instances on solaris environment. I have implemented the coherence in the following way. When ever I down either one of the instance its working fine and again restarted the down instance and again make the other instance state as down. At this moment its failing to hold the cahce values. Where I can keep the coherence-cache-config.xml file in the server environmet. for this I have created one environment variable and set like the following way, -
Dtangosol.coherence.cacheconfig=../2ee/home\config\coherence-cache-config.xml
The following is the code where I implented caching.
package com.deceval.brc.brcentcmdframework;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.HashMap;
import org.apache.log4j.Logger;
import com.deceval.brc.brcentcmd.EntCmdProxyObj;
import com.tangosol.net.CacheFactory;
import com.tangosol.net.NamedCache;
public class EntCmdRefObj implements Serializable{
     private static final long serialVersionUID = 1L;
     private static EntCmdRefObj refObj = null;
     private HashMap<String, Integer> refMap = null;
     private ArrayList<EntCmdProxyObj> arregloFirmantes;
     private final NamedCache m_cache = CacheFactory.getCache("FirmanteCache");
     public static Logger mLog = Logger.getLogger(EntCmdRefObj.class);
     public EntCmdRefObj() {
          refMap = new HashMap<String, Integer>();
          setArregloFirmantes(new ArrayList<EntCmdProxyObj>());
          //arregloFirmantes = new ArrayList<EntCmdProxyObj>();
     public static EntCmdRefObj getInstance() {
          if (refObj == null) {
               refObj = new EntCmdRefObj();
          return refObj;
     public HashMap<String, Integer> getRefMap() {
          return refMap;
     public void setRefMap(HashMap<String, Integer> refMap) {
          this.refMap = refMap;
     public ArrayList<EntCmdProxyObj> getArregloFirmantes() {
          mLog.info("IN ENtCmdRefObj : " + (ArrayList<EntCmdProxyObj>)m_cache.get("FirmanteCache"));
          mLog.info("IN ENtCmdRefObj : " + ((ArrayList<EntCmdProxyObj>)m_cache.get("FirmanteCache")).size());
          return (ArrayList<EntCmdProxyObj>)m_cache.get("FirmanteCache");
     public void lock() {
          m_cache.lock("monitor", -1L);
     public void unlock() {
          m_cache.unlock("monitor");
     public void setArregloFirmantes(ArrayList<EntCmdProxyObj> pArregloFirmantes) {
          m_cache.put("FirmanteCache", pArregloFirmantes);
          //this.arregloFirmantes = arregloFirmantes;
coherence-cache-config.xml
<?xml version="1.0"?>
<!DOCTYPE cache-config SYSTEM "cache-config.dtd">
<cache-config>
<caching-scheme-mapping>
<!--
Caches with any name will be created as default replicated.
-->
<cache-mapping>
<cache-name>*</cache-name>
<scheme-name>default-replicated</scheme-name>
</cache-mapping>
<cache-mapping>
<cache-name>FirmanteCache</cache-name>
<scheme-name>default-distributed</scheme-name>
</cache-mapping>
</caching-scheme-mapping>
<caching-schemes>
<!--
Default Replicated caching scheme.
-->
<replicated-scheme>
<scheme-name>default-replicated</scheme-name>
<service-name>ReplicatedCache</service-name>
<backing-map-scheme>
<class-scheme>
<scheme-ref>default-backing-map</scheme-ref>
</class-scheme>
</backing-map-scheme>
</replicated-scheme>
<!--
Default Distributed caching scheme.
-->
<distributed-scheme>
<scheme-name>default-distributed</scheme-name>
<service-name>DistributedCache</service-name>
<backing-map-scheme>
<class-scheme>
<scheme-ref>default-backing-map</scheme-ref>
</class-scheme>
</backing-map-scheme>
</distributed-scheme>
<!--
Default backing map scheme definition used by all
The caches that do not require any eviction policies
-->
<class-scheme>
<scheme-name>default-backing-map</scheme-name>
<class-name>com.tangosol.util.SafeHashMap</class-name>
</class-scheme>
</caching-schemes>
</cache-config>