Blob field using cmp

Hi ,
I need to retrieve the blob data stored in oracle 9i database.
I am using studio 5 to create a CMP using which the blob field gets mapped to java.io.Serializable class. Oracle thin driver is used and an image of size 1 kb is stored in the table.
When the client (servlet) calls the method to get the contents of the blob field, the following exceptions are thrown :
com.sun.jdo.api.persistence.support.JDOFatalDataStoreException: IOException reading serializable object from byte array.
NestedException: java.io.StreamCorruptedException: invalid stream header
     at com.sun.jdo.spi.persistence.support.ejb.cmp.JDOEJB11HelperImpl.readSerializableObjectFromByteArray(JDOEJB11HelperImpl.java:340)
     at orclblobfolder.orclejb.orclblobBean_1927863344_ConcreteImpl.getImage(orclblobBean_1927863344_ConcreteImpl.java:177)
     at orclblobfolder.orclejb.orclblobBean.getBlobImage(orclblobBean.java:84)
     at orclblobfolder.orclejb.orclblobBean_1927863344_ConcreteImpl_EJBObjectImpl.getBlobImage(orclblobBean_1927863344_ConcreteImpl_EJBObjectImpl.java:22)
     at orclblobfolder.orclejb._orclblobBean_1927863344_ConcreteImpl_EJBObjectImpl_Tie._invoke(Unknown Source)
     at com.sun.corba.ee.internal.POA.GenericPOAServerSC.dispatchToServant(GenericPOAServerSC.java:569)
     at com.sun.corba.ee.internal.POA.GenericPOAServerSC.internalDispatch(GenericPOAServerSC.java:211)
     at com.sun.corba.ee.internal.POA.GenericPOAServerSC.dispatch(GenericPOAServerSC.java:113)
     at com.sun.corba.ee.internal.iiop.ORB.process(ORB.java:275)
     at com.sun.corba.ee.internal.iiop.LocalClientRequestImpl.invoke(LocalClientRequestImpl.java:96)
     at com.sun.corba.ee.internal.corba.ClientDelegate.invoke(ClientDelegate.java:237)
     at com.sun.corba.ee.internal.POA.GenericPOAClientSC.invoke(GenericPOAClientSC.java:97)
     at org.omg.CORBA.portable.ObjectImpl._invoke(ObjectImpl.java:457)
     at orclblobfolder.orclejb._orclblob_Stub.getBlobImage(Unknown Source)
     at orclblobfolder.orclejb._orclblob_Stub.getBlobImage(Unknown Source)
     at test.processRequest(test.java:67)
     at test.doGet(test.java:127)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.catalina.core.StandardWrapperValve.invokeServletService(StandardWrapperValve.java:720)
     at org.apache.catalina.core.StandardWrapperValve.access$000(StandardWrapperValve.java:118)
     at org.apache.catalina.core.StandardWrapperValve$1.run(StandardWrapperValve.java:278)
     at java.security.AccessController.doPrivileged(Native Method)
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:274)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:212)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:203)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)
     at com.iplanet.ias.web.connector.nsapi.NSAPIProcessor.process(NSAPIProcessor.java:157)
     at com.iplanet.ias.web.WebContainer.service(WebContainer.java:598)
snippet of bean class is :
public abstract java.io.Serializable getImage();
public abstract void setImage(java.io.Serializable image);
public java.io.Serializable getBlobImage() {
//method which client calls
return getImage();
Similar exceptions are thrown when I use poinbase wherein blob data is mapped to byte[] instead of java.io.Serializable.
Please let me know how can I resolve this problem.
Thanks a lot,
-Amol

How does it effect, when the blob data is stored indatabase using an external source
The current CMP implementation assumes that a serializable field is stored by serializing it to a byte[] and then storing the byte[] as blob. while retrieving the data, it always tries to de-serialize the byte[] in to a serializable field. Hence if you have stored the data externally, it would fail with "JDOFatalDataStoreException: IOException reading serializable object from byte array."
Thanks,
Mitesh

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