Replicated cache with cache store configuration

Question

Hi All,
I am having two different applications. One is Admin kind of module from where data will be insterted/updated and another application will read data from Coherence cache.
My requirement is to use Replicated cache and data also needs to be stored in the database. I am configuring cache with cache store DB operation.
I have following coherence configuration. It works fine. Other application is able to read updated data. But while second application is trying to join the first application coherence cluster I am getting following exception in cache store. If I use distributed cache the same cache store works fine without any issues.
Also note that eventhough it is throwing exception, application is working fine as expected. Other thing I am pre loading data on application start up in first application.
Let me know if you need any further information.
Thanks in advance.
coherence-cache-config.xml
<?xml version="1.0"?>
<!DOCTYPE cache-config SYSTEM "cache-config.dtd">
<cache-config>
<caching-scheme-mapping>
<cache-mapping>
<cache-mapping>
<cache-name>TestCache</cache-name>
<scheme-name>TestCacheDB</scheme-name>
</cache-mapping>
</caching-scheme-mapping>
<caching-schemes>
<replicated-scheme>
<scheme-name>TestCacheDB</scheme-name>
<service-name>ReplicatedCache</service-name>
<backing-map-scheme>
<local-scheme>
<scheme-name>TestDBLocal</scheme-name>
<cachestore-scheme>
<class-scheme>
<class-name>test.TestCacheStore</class-name>
<init-params>
<init-param>
<param-type>java.lang.String</param-type>
<param-value>TEST_SUPPORT</param-value>
</init-param>
</init-params>
</class-scheme>
</cachestore-scheme>
</local-scheme>
</backing-map-scheme>
<listener/>
<autostart>true</autostart>
</replicated-scheme>
<!--
Proxy Service scheme that allows remote clients to connect to the
cluster over TCP/IP.
-->
<proxy-scheme>
<scheme-name>proxy</scheme-name>
<service-name>ProxyService</service-name>
<thread-count system-property="tangosol.coherence.extend.threads">10</thread-count>
<acceptor-config>
<tcp-acceptor>
<local-address>
<address system-property="tangosol.coherence.extend.address">localhost</address>
<port system-property="tangosol.coherence.extend.port">7001</port>
<reusable>true</reusable>
</local-address>
</tcp-acceptor>
<serializer>
<class-name>com.tangosol.io.pof.ConfigurablePofContext</class-name>
<init-params>
<init-param>
<param-type>String</param-type>
<param-value>pof-config.xml</param-value>
</init-param>
</init-params>
</serializer>
</acceptor-config>
<autostart system-property="tangosol.coherence.extend.enabled">false</autostart> </proxy-scheme>
</caching-schemes>
</cache-config>
Exception:
2010-08-31 10:46:09.062/171.859 Oracle Coherence GE 3.5.2/463 <Error> (thread=ReplicatedCache, member=2): java.lang.Clas
sCastException: com.tangosol.util.Binary cannot be cast to test.TestBean
at test.TestCacheStore.store(TestCacheStore.java:137)
at com.tangosol.net.cache.LocalCache$InternalListener.onModify(LocalCache.java:637)
at com.tangosol.net.cache.LocalCache$InternalListener.entryInserted(LocalCache.java:599)
at com.tangosol.util.MapEvent.dispatch(MapEvent.java:206)
at com.tangosol.util.MapEvent.dispatch(MapEvent.java:166)
at com.tangosol.util.MapListenerSupport.fireEvent(MapListenerSupport.java:556)
at com.tangosol.net.cache.OldCache.dispatchEvent(OldCache.java:1916)
at com.tangosol.net.cache.OldCache$Entry.onAdd(OldCache.java:1985)
at com.tangosol.util.SafeHashMap.put(SafeHashMap.java:244)
at com.tangosol.net.cache.OldCache.put(OldCache.java:266)
at com.tangosol.coherence.component.util.CacheHandler.onLeaseUpdate(CacheHandler.CDB:42)
at com.tangosol.coherence.component.util.CacheHandler.populateCache(CacheHandler.CDB:33)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.ReplicatedCache$CacheUpdate.onReceiv
ed(ReplicatedCache.CDB:5)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Grid.onMessage(Grid.CDB:9)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Grid.onNotify(Grid.CDB:136)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.ReplicatedCache.onNotify(ReplicatedC
ache.CDB:3)
at com.tangosol.coherence.component.util.Daemon.run(Daemon.CDB:42)
at java.lang.Thread.run(Thread.java:619)
2010-08-31 10:46:09.203/216.735 Oracle Coherence GE 3.5.2/463 <D5> (thread=DistributedCache, member=2): Deferring the di
stribution due to 128 pending configuration updates
TestBean.java
public class TestBean implements PortableObject, Serializable {
     private static final long serialVersionUID = 1L;
     private String name;
     private String number;
     private String taskType;
     public String getName() {
          return name;
     public void setName(String name) {
          this.name = name;
     public String getNumber() {
          return productId;
     public void setNumber(String number) {
          this.number= number;
     public String getTaskType() {
          return taskType;
     public void setTaskType(String taskType) {
          this.taskType = taskType;
     @Override
     public void readExternal(PofReader reader) throws IOException {
          name = reader.readString(0);
          number = reader.readString(1);
          taskType = reader.readString(2);
     @Override
     public void writeExternal(PofWriter writer) throws IOException {
          writer.writeString(0, name);
          writer.writeString(1, number);
          writer.writeString(2, taskType);
TestCacheStore.java
public class TestCacheStore extends Base implements CacheStore {
     @Override
     public void store(Object oKey, Object oValue) {
     if(logger.isInfoEnabled())
          logger.info("store :"+oKey);
     TestBean testBean = (TestBean)oValue; //Giving classcast exception here
//Doing some processing here over testBean
          ConnectionFactory connectionFactory = ConnectionFactory.getInstance();
          //Get the Connection
          Connection con = connectionFactory.getConnection();
          if(con != null){
//Code to insert into the database
          }else{
               logger.error("Connection is NULL");
Edited by: user8279242 on Aug 30, 2010 11:44 PM

Answer 1

Hello,
The problem is that replicated caches are not supported with read write backing maps.
Please refer to the link below for more information.
http://download.oracle.com/docs/cd/E15357_01/coh.360/e15723/cache_rtwtwbra.htm#CFHEJHCI
Best regards,
-Dave