Issue with POF serialization - Failure to deserialize an Invocable object: java.io.StreamCorruptedException

Question

Am running into following exception even after following all guidelines to implement POF. The main objective is to perform Distributed Bulk cache loading.
Oracle Coherence GE 3.7.1.10 <Error> (thread=Invocation:InvocationService, member=1): Failure to deserialize an Invocable object: java.io.StreamCorruptedException: unknown user type: 1001
java.io.StreamCorruptedException: unknown user type: 1001
  at com.tangosol.io.pof.PofBufferReader.readAsObject(PofBufferReader.java:3312)
  at com.tangosol.io.pof.PofBufferReader.readObject(PofBufferReader.java:2604)
  at com.tangosol.io.pof.ConfigurablePofContext.deserialize(ConfigurablePofContext.java:371)
  at com.tangosol.coherence.component.util.daemon.queueProcessor.Service.readObject(Service.CDB:1)
  at com.tangosol.coherence.component.net.Message.readObject(Message.CDB:1)
  at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.InvocationService$InvocationRequest.read(InvocationService.CDB:8)
  at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Grid.deserializeMessage(Grid.CDB:19)
  at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Grid.onNotify(Grid.CDB:31)
  at com.tangosol.coherence.component.util.Daemon.run(Daemon.CDB:42)
  at java.lang.Thread.run(Thread.java:662)
Following is the pof-config.xml
<?xml version="1.0" encoding="UTF-8" ?>
<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/1.1/coherence-pof-config.xsd">
  <user-type-list>
    <include>coherence-pof-config.xml</include>
    <user-type>
      <type-id>1001</type-id>
      <class-name>com.westgroup.coherence.bermuda.loader.DistributedLoaderAgent</class-name>
      <serializer>
        <class-name>com.tangosol.io.pof.PofAnnotationSerializer</class-name>     
        <init-params>
          <init-param>
            <param-type>int</param-type>
            <param-value>{type-id}</param-value>
          </init-param>
          <init-param>
            <param-type>java.lang.Class</param-type>
            <param-value>{class}</param-value>
          </init-param>
          <init-param>
            <param-type>boolean</param-type>
            <param-value>true</param-value>
          </init-param>
        </init-params>
      </serializer>
    </user-type>
     <user-type>
      <type-id>1002</type-id>
      <class-name>com.westgroup.coherence.bermuda.profile.lpa.LPACacheProfile</class-name>
      <serializer>
        <class-name>com.tangosol.io.pof.PofAnnotationSerializer</class-name>     
        <init-params>
          <init-param>
            <param-type>int</param-type>
            <param-value>{type-id}</param-value>
          </init-param>
          <init-param>
            <param-type>java.lang.Class</param-type>
            <param-value>{class}</param-value>
          </init-param>
          <init-param>
            <param-type>boolean</param-type>
            <param-value>true</param-value>
          </init-param>
        </init-params>
      </serializer>
    </user-type>
     <user-type>
      <type-id>1003</type-id>
      <class-name>com.westgroup.coherence.bermuda.profile.lpa.Address</class-name>
      <serializer>
        <class-name>com.tangosol.io.pof.PofAnnotationSerializer</class-name>     
        <init-params>
          <init-param>
            <param-type>int</param-type>
            <param-value>{type-id}</param-value>
          </init-param>
          <init-param>
            <param-type>java.lang.Class</param-type>
            <param-value>{class}</param-value>
          </init-param>
          <init-param>
            <param-type>boolean</param-type>
            <param-value>true</param-value>
          </init-param>
        </init-params>
      </serializer>
    </user-type>
     <user-type>
      <type-id>1004</type-id>
      <class-name>com.westgroup.coherence.bermuda.profile.lpa.Discipline</class-name>
      <serializer>
        <class-name>com.tangosol.io.pof.PofAnnotationSerializer</class-name>     
        <init-params>
          <init-param>
            <param-type>int</param-type>
            <param-value>{type-id}</param-value>
          </init-param>
          <init-param>
            <param-type>java.lang.Class</param-type>
            <param-value>{class}</param-value>
          </init-param>
          <init-param>
            <param-type>boolean</param-type>
            <param-value>true</param-value>
          </init-param>
        </init-params>
      </serializer>
    </user-type>
     <user-type>
      <type-id>1005</type-id>
      <class-name>com.westgroup.coherence.bermuda.profile.lpa.Employment</class-name>
      <serializer>
        <class-name>com.tangosol.io.pof.PofAnnotationSerializer</class-name>     
        <init-params>
          <init-param>
            <param-type>int</param-type>
            <param-value>{type-id}</param-value>
          </init-param>
          <init-param>
            <param-type>java.lang.Class</param-type>
            <param-value>{class}</param-value>
          </init-param>
          <init-param>
            <param-type>boolean</param-type>
            <param-value>true</param-value>
          </init-param>
        </init-params>
      </serializer>
    </user-type>
  </user-type-list>
  <allow-interfaces>true</allow-interfaces>
  <allow-subclasses>true</allow-subclasses>
</pof-config>
cache-config.xml
<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 http://xmlns.oracle.com/coherence/coherence-cache-config/1.1/coherence-cache-config.xsd">
   <defaults>
    <serializer>pof</serializer>
    </defaults>
  <caching-scheme-mapping>
  <cache-mapping>
  <cache-name>DistributedLPACache</cache-name>
  <scheme-name>LPANewCache</scheme-name>
  <init-params>
  <init-param>
  <param-name>back-size-limit</param-name>
  <param-value>250MB</param-value>
  </init-param>
  </init-params>
  </cache-mapping>
  </caching-scheme-mapping>
  <caching-schemes>
  <!-- Distributed caching scheme. -->
  <distributed-scheme>
  <scheme-name>LPANewCache</scheme-name>
  <service-name>HBaseLPACache</service-name>
  <serializer>
  <instance>
             <class-name>com.tangosol.io.pof.ConfigurablePofContext</class-name>
             <init-params>
               <init-param>
                 <param-type>java.lang.String</param-type>
                 <param-value>pof-config.xml</param-value>
               </init-param>
             </init-params>
        </instance>
  </serializer>
  <backing-map-scheme>
  <read-write-backing-map-scheme>
  <internal-cache-scheme>
  <class-scheme>
  <class-name>com.tangosol.util.ObservableHashMap</class-name>
  </class-scheme>
  </internal-cache-scheme>
  <cachestore-scheme>
  <class-scheme>
  <class-name>com.westgroup.coherence.bermuda.profile.lpa.LPACacheProfile</class-name>
  </class-scheme>
  </cachestore-scheme>
  <read-only>false</read-only>
  <write-delay-seconds>0</write-delay-seconds>
  </read-write-backing-map-scheme>
  </backing-map-scheme>
  <autostart>true</autostart>
  </distributed-scheme>
  <invocation-scheme>
       <scheme-name>InvocationService</scheme-name>
       <service-name>InvocationService</service-name>
       <thread-count>5</thread-count>
       <autostart>true</autostart>
    </invocation-scheme>
  </caching-schemes>
</cache-config>
DistributedLoaderAgent (user type 1001)
import java.io.IOException;
import java.io.Serializable;
import java.lang.annotation.Annotation;
import org.apache.log4j.Logger;
import com.tangosol.io.pof.PofReader;
import com.tangosol.io.pof.PofWriter;
import com.tangosol.io.pof.PortableObject;
import com.tangosol.io.pof.annotation.Portable;
import com.tangosol.io.pof.annotation.PortableProperty;
import com.tangosol.net.AbstractInvocable;
import com.tangosol.net.InvocationService;
@Portable
public class DistributedLoaderAgent extends AbstractInvocable implements PortableObject{
  private static final long serialVersionUID = 10L;
  private static Logger m_logger = Logger.getLogger(DistributedLoaderAgent.class);
  @PortableProperty(0)
  public String partDumpFileName = null;
  public String getPartDumpFileName() {
  return partDumpFileName;
  public void setPartDumpFileName(String partDumpFileName) {
  this.partDumpFileName = partDumpFileName;
  public DistributedLoaderAgent(){
  super();
  m_logger.debug("Configuring this loader ");
  public DistributedLoaderAgent(String partDumpFile){
  super();
  m_logger.debug("Configuring this loader to load dump file "+ partDumpFile);
  partDumpFileName = partDumpFile;
  @Override
  public void init(InvocationService service) {
  // TODO Auto-generated method stub
  super.init(service);
  @Override
  public void run() {
  // TODO Auto-generated method stub
  try{
  m_logger.debug("Invoked DistributedLoaderAgent");
  MetadataTranslatorService service = new MetadataTranslatorService(false, "LPA");
  m_logger.debug("Invoking service.loadLPACache");
  service.loadLPACache(partDumpFileName);
  }catch(Exception e){
  m_logger.debug("Exception in DistributedLoaderAgent " + e.getMessage());
  @Override
  public void readExternal(PofReader arg0) throws IOException {
  // TODO Auto-generated method stub
  setPartDumpFileName(arg0.readString(0));
  @Override
  public void writeExternal(PofWriter arg0) throws IOException {
  // TODO Auto-generated method stub
  arg0.writeString(0, getPartDumpFileName());
Please assist.

Answer 1

OK I have two suggestions.
1. Always create and flush the ObjectOutputStream before creating the ObjectInputStream.
2. Always close the output before you close the input. Actually once you close the output stream both the input stream and the socket are closed anyway so you can economize on this code. In the above you have out..writeObject() followed by input.close() followed by out.close(). Change this to out.writeObject() followed by out.close(). It may be that something needed flushing and the input.close() prevented the flush from happening.