POFing Enums... InstantiationException

Question

I'm getting this exception
Exception in thread "Thread-1" (Wrapped) java.io.IOException: An exception occurred instantiating a PortableObject user type from a POF stream: type-id=10015, class-name=oms.grid.SendingType, exception=
java.lang.InstantiationException: oms.grid.SendingType
        at com.tangosol.util.ExternalizableHelper.fromBinary(ExternalizableHelper.java:265)
        at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.partitionedService.PartitionedCache$ConverterFromBinary.convert(PartitionedCache.CDB:4)
        at com.tangosol.util.ConverterCollections$ConverterInvocableMap.invoke(ConverterCollections.java:2281)
        at com.tangosol.util.ConverterCollections$ConverterNamedCache.invoke(ConverterCollections.java:2747)
        at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.partitionedService.PartitionedCache$ViewMap.invoke(PartitionedCache.CDB:11)
        at com.tangosol.coherence.component.util.SafeNamedCache.invoke(SafeNamedCache.CDB:1)
        at coup.QueueReader.run(QueueReader.java:105)
        at java.lang.Thread.run(Thread.java:722)
Caused by: java.io.IOException: An exception occurred instantiating a PortableObject user type from a POF stream: type-id=10015, class-name=oms.grid.SendingType, exception=java.lang.InstantiationException: oms.grid.SendingType
        at com.tangosol.io.pof.PortableObjectSerializer.deserialize(PortableObjectSerializer.java:122)
        at com.tangosol.io.pof.PofBufferReader.readAsObject(PofBufferReader.java:3306)
        at com.tangosol.io.pof.PofBufferReader.readAsObjectArray(PofBufferReader.java:3350)
        at com.tangosol.io.pof.PofBufferReader.readAsObject(PofBufferReader.java:2924)
        at com.tangosol.io.pof.PofBufferReader.readObject(PofBufferReader.java:2603)
        at com.tangosol.io.pof.ConfigurablePofContext.deserialize(ConfigurablePofContext.java:358)
        at com.tangosol.util.ExternalizableHelper.deserializeInternal(ExternalizableHelper.java:2745)
        at com.tangosol.util.ExternalizableHelper.fromBinary(ExternalizableHelper.java:261)
        ... 7 moremy SendingType.java file looks like
package oms.grid;
import com.tangosol.io.pof.PofReader;
import com.tangosol.io.pof.PofWriter;
import com.tangosol.io.pof.PortableObject;
import java.io.IOException;
public enum SendingType implements PortableObject {
    NEW_ORDER,
    CANCEL,
    REPLACE,
    IGNORE;
    public void readExternal(PofReader reader) throws IOException {
    public void writeExternal(PofWriter writer) throws IOException {
}probably I'm making this too difficult, right?
Thanks,
Andrew

Answer 1

We just use a generic serializer for all enums:
public class EnumSerializer implements PofSerializer {
     @SuppressWarnings({ "rawtypes" })
     private final Class<Enum> type;
     private final Object[] enumValues;
     @SuppressWarnings({ "unchecked", "rawtypes" })
     public EnumSerializer(int typeId, Class<Enum> type) {
          try {
               this.type = type;
               enumValues = EnumSet.allOf(type).toArray();
          } catch(Throwable t) {
               t.printStackTrace();
               throw new RuntimeException(t);
    @Override
    public Object deserialize(PofReader in) throws IOException {
         try {
              final int ordinal = in.readInt(0);
              try {
                   return enumValues[ordinal];
              } catch(ArrayIndexOutOfBoundsException e) {
                   throw new IOException(String.format("An error ocurred trying to deserialize enum [%s]: ordinal %d is not a valid value.", type.getName(), ordinal), e);
        } finally {
            in.readRemainder();
    @SuppressWarnings({ "rawtypes" })
    @Override
    public void serialize(PofWriter out, Object obj) throws IOException {
         Enum e = (Enum) obj;
        out.writeInt(0, e.ordinal());
        out.writeRemainder(null);
}Regards, Paul