Unable to load the pof configuration

Question

Hi all,
Im trying with pof serialization but unable to load the pof configuration and im getting the following error:
2013-06-12 14:41:49,582 [catalina-exec-1] ERROR com.distcachedemo.KnCacheDemoServlet - doPost(HttpServletRequest, HttpServletResponse)::
(Wrapped) java.io.NotSerializableException: com.distcachedemo.dto.KnMasterListResponse
    at com.tangosol.util.ExternalizableHelper.toBinary(ExternalizableHelper.java:215)
    at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.partitionedService.PartitionedCache$ConverterValueToBinary.convert(PartitionedCache.CDB:3)
    at com.tangosol.util.ConverterCollections$ConverterMap.put(ConverterCollections.java:1674)
    at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.partitionedService.PartitionedCache$ViewMap.put(PartitionedCache.CDB:1)
    at com.tangosol.coherence.component.util.SafeNamedCache.put(SafeNamedCache.CDB:1)
    at com.distcachedemo.KnCorpContactInfoControllerDemo.getMasterList(KnCorpContactInfoControllerDemo.java:183)
    at com.distcachedemo.KnCacheDemoServlet.doPost(KnCacheDemoServlet.java:60)
Please let me know what is that i need to correct in the below:
NOTE: I have also tried Proxy Scheme with serializer and it too did not work
          From the coherence logs i havent found the log of POF configuration being loaded.
Configuration used:
============
cache-config.xml::
<?xml version="1.0"?>
<cache-config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xmlns="http://xmlns.oracle.com/coherence/coherence-cache-config"
   xsi:schemaLocation="http://xmlns.oracle.com/coherence/coherence-cache-config coherence-cache-config.xsd">
   <caching-scheme-mapping>
      <cache-mapping>
         <cache-name>nspoc*</cache-name>
         <scheme-name>distributed-ns</scheme-name>
      </cache-mapping>
     <cache-mapping>
         <cache-name>poc*</cache-name>
         <scheme-name>distributed</scheme-name>
      </cache-mapping>
   </caching-scheme-mapping>
<caching-schemes>
      <distributed-scheme>
         <scheme-name>distributed-ns</scheme-name>
         <service-name>DistributedCache-ns</service-name>
         <thread-count>4</thread-count>
         <request-timeout>60s</request-timeout>
         <backing-map-scheme>
                    <external-scheme>
                        <nio-memory-manager>
                            <initial-size>1MB</initial-size>
                            <maximum-size>100MB</maximum-size>
                        </nio-memory-manager>
                        <high-units>100</high-units>
                        <unit-calculator>BINARY</unit-calculator>
                        <unit-factor>1048576</unit-factor>
                    </external-scheme>
         </backing-map-scheme>
         <autostart>true</autostart>
      </distributed-scheme>
      <distributed-scheme>
         <scheme-name>distributed</scheme-name>
         <service-name>DistributedCache</service-name>
         <thread-count>4</thread-count>
         <request-timeout>60s</request-timeout>
         <backing-map-scheme>
            <read-write-backing-map-scheme>
                <internal-cache-scheme>
                    <external-scheme>
                        <nio-memory-manager>
                            <initial-size>1MB</initial-size>
                            <maximum-size>100MB</maximum-size>
                        </nio-memory-manager>
                        <high-units>100</high-units>
                        <unit-calculator>BINARY</unit-calculator>
                        <unit-factor>1048576</unit-factor>
                    </external-scheme>
              </internal-cache-scheme>
              <cachestore-scheme>
                <class-scheme>
                    <class-factory-name>com.distcachedemo.KnPocCacheStoreFactory</class-factory-name>
                    <method-name>loadCacheStore</method-name>
                    <init-params>
                      <init-param>
                        <param-type>java.lang.String</param-type>
                        <param-value>{cache-name}</param-value>
                      </init-param>
                    </init-params>
                </class-scheme>
               </cachestore-scheme>
            </read-write-backing-map-scheme>
         </backing-map-scheme>
         <autostart>true</autostart>
      </distributed-scheme>
      <local-scheme>
         <scheme-name>LocalSizeLimited</scheme-name>
         <eviction-policy>LRU</eviction-policy>
         <high-units>5000</high-units>
         <expiry-delay>1h</expiry-delay>
      </local-scheme>
   </caching-schemes>
</cache-config>
=================
tangosol-coherence-override.xml:
<?xml version='1.0'?>
<coherence xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xmlns="http://xmlns.oracle.com/coherence/coherence-operational-config"
   xsi:schemaLocation="http://xmlns.oracle.com/coherence/coherence-operational-config coherence-operational-config.xsd">
   <cluster-config>
      <member-identity>
         <cluster-name system-property="tangosol.coherence.cluster">kn_test</cluster-name>
      </member-identity>
      <unicast-listener>
         <well-known-addresses>
            <socket-address id="719">
               <address>192.168.7.19</address>
               <port>8088</port>
            </socket-address>
            <socket-address id="3246">
               <address>192.168.3.246</address>
               <port>8088</port>
            </socket-address>
            <socket-address id="77">
               <address>192.168.7.7</address>
               <port>8088</port>
            </socket-address>
         </well-known-addresses>
         <address system-property="tangosol.coherence.localhost">192.168.7.7</address>
         <port system-property="tangosol.coherence.localport">8088</port>
         <port-auto-adjust system-property="tangosol.coherence.localport.adjust">true</port-auto-adjust> 
      </unicast-listener>
<serializers>
      <serializer id="java">
         <class-name>com.tangosol.io.DefaultSerializer</class-name>
      </serializer>
      <serializer id="pof">
         <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>
   </serializers>
   </cluster-config>
   <configurable-cache-factory-config>
      <init-params>
         <init-param>
            <param-type>java.lang.String</param-type>
            <param-value system-property="tangosol.coherence.cacheconfig">cache-config.xml</param-value>
         </init-param>
      </init-params>
   </configurable-cache-factory-config>
</coherence>
======================
pof-config.xml:
<?xml version='1.0'?>
<pof-config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xmlns="http://xmlns.oracle.com/coherence/coherence-pof-config"
   xsi:schemaLocation="http://xmlns.oracle.com/coherence/coherence-pof-config
   coherence-pof-config.xsd">
   <user-type-list>
      <include>coherence-pof-config.xml</include>
      <user-type>
        <type-id>1001</type-id>
        <class-name>com.distcachedemo.dto.KnMasterListResponse</class-name>
      </user-type>
   </user-type-list>
</pof-config>
============
Java Code:
package com.distcachedemo.dto;
import com.tangosol.io.pof.PofReader;
import com.tangosol.io.pof.PofWriter;
import com.tangosol.io.pof.PortableObject;
import java.io.IOException;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
public class KnMasterListResponse implements PortableObject {
  private static final long serialVersionUID = -9114918011531875153L;
  private KnHierarchyListDTO hierarchyListDTO;
  private Map subsMap;
  public KnHierarchyListDTO getHierarchyListDTO() {
  return hierarchyListDTO;
  public void setHierarchyListDTO(KnHierarchyListDTO hierarchyListDTO) {
  this.hierarchyListDTO = hierarchyListDTO;
  public Map getSubsMap() {
  return subsMap;
  public void setSubsMap(Map subsMap) {
  this.subsMap = subsMap;
  public String toString() {
  StringBuilder strBuffer = new StringBuilder(100);
  if (hierarchyListDTO.getHierachyDTOs() != null) {
  strBuffer.append(" hierarchyListDTO - ").append(hierarchyListDTO.getHierachyDTOs().size());
  if (subsMap != null) {
  strBuffer.append(" subsMap - ").append(subsMap.size());
  return strBuffer.toString();
  @Override
  public void readExternal(PofReader pofReader) throws IOException {
  subsMap = pofReader.readMap(0, new HashMap<>());
  hierarchyListDTO = (KnHierarchyListDTO) pofReader.readObject(1);
  @Override
  public void writeExternal(PofWriter pofWriter) throws IOException {
  pofWriter.writeMap(0, subsMap);
  pofWriter.writeObject(1, hierarchyListDTO);
Thanks,
Ravi Shanker

Answer 1

Hi Ravi,
it is generally recommended that all new classes support POF in this or that way. This or that means either implementing PortableObject or to provide a PofSerializer implementation to be able to optimally serialize their state. Obviously it is not always possible but you should try to achieve that.
If it is not possible, then you can still convert them to byte[] or String by some other means. If that other means is Java serialization, then Coherence provides a different PofContext implementation (SafeConfigurablePofContext) which you can use instead of ConfigurablePofContext and which is able to fall back to Java serialization for Serializable classes (and also for types not registered in POF configuration but which implement PortableObject). However it is recommended that SafeConfigurablePofContext is not used in production, typically because Java serialization is generally inferior to POF serialization when looking at performance and serialized size, and SafeConfigurablePofContext does not force you to do the right thing, and finally because Java serialization is not platform-independent whereas POF is.
Best regards,
Rob