Exception writing persisted object with XMLEncoder

abulhaaris · **Posted:** Wed Jan 21, 2004 1:50 am

I loaded a hibernate persisted object using session.load(id) and Hibernate.initialize the collections contained with the object. When I attempted to write out the object graph using java.bean.XMLEncoder, I ended up with the following exception:

Code:

java.lang.IllegalArgumentException: object is not an instance of declaring class
java.lang.Exception: discarding statement XMLEncoder0.writeObject(Quotation$$EnhancerByCGLIB$$bc2ff890);

It is evident that the CGLIB enhanced object is being passed to XMLEncoder. Here is the code that is attempting to write:

Code:

          Quotation q = iman.getQuotation(new Long(41));
          XMLEncoder e = null;
          try {
             e = new XMLEncoder(new FileOutputStream("Quotation.xml"));
             e.writeObject(q); // this will write the entire object graph.
          }
          catch(Exception ex) {
            System.out.println(ex);
          }

How do I pass the "right" object to XMLEncoder's writeObject method?

Here is the hbm for the object in question:

Code:

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
   "-//Hibernate/Hibernate Mapping DTD//EN"
   "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">
   <!-- $Id: Quotation.hbm.xml,v 1.1 2004/01/20 12:19:40 aslam Exp $ -->

<hibernate-mapping schema="CPO2">
 <class name="com.cgc.esd.purchasing.Quotation" table="CPO_RFQ_QUOTS"
        proxy="com.cgc.esd.purchasing.Quotation">

   <id name="id" column="QUOT_ID" type="java.lang.Long"
            unsaved-value="null">
          <generator class="native">
            <param name ="sequence">CPO_RFQ_QUOTS_S</param>
          </generator>
   </id>

        <property name="quotationCreationDate"  column="QUOT_CREATION_DATE" type="timestamp"/>
        <property name="supplierQuotationId"  column="SUPL_QUOT_ID" type="java.lang.Long"/>
        <property name="statusLookup"  column="QUOT_STATUS_LKP" type="string"/>
        <property name="termsOfPaymentLookup"  column="TERMS_OF_PAYMENT_LKP" type="string"/>
        <property name="modeOfPaymentLookup"  column="MODE_OF_PAYMENT_LKP" type="string"/>
        <property name="typeLookup"  column="QUOT_TYPE_LKP" type="string"/>
        <property name="deliveryTerms"  column="DELIVERY_TERMS" type="string"/>
        <property name="shipmentTermsLookup"  column="SHIPMENT_TERMS_LKP" type="string"/>
        <property name="freightAndOtherCharges"  column="FRGT_AND_OTHER_CHARGES" type="java.lang.Long"/>
        <property name="receiveDate"  column="QUOT_RECEIVE_DATE" type="timestamp"/>
        <property name="shipmentFromLookup"  column="SHIPMENT_FROM_LKP" type="string"/>
        <property name="currencyLookup"  column="CURRENCY_LKP" type="string"/>
        <property name="discountPercentage"  column="DISCOUNT_PCT" type="java.lang.Long"/>
        <property name="discountValue"  column="DISCOUNT_VAL" type="java.lang.Long"/>
        <property name="importRebatePercentage"  column="IMPORT_REBATE_PCT" type="java.lang.Long"/>
        <property name="importRebateValue"  column="IMPORT_REBATE_VAL" type="java.lang.Long"/>
        <property name="remarks"  column="REMARKS" type="string"/>
        <property name="agentCode"  column="AGENT_CODE" type="java.lang.Long"/>
        <property name="validFrom"  column="QUOT_VALID_FROM" type="timestamp"/>
        <property name="agentCommission"  column="AGENT_COMMISSION" type="java.lang.Long"/>
        <property name="validTill"  column="QUOT_VALID_TILL" type="timestamp"/>
        <property name="supplierBankName"  column="SUPL_BANK_NAME" type="string"/>
        <property name="bankBranchName"  column="BANK_BRANCH_NAME" type="string"/>
        <property name="bankAccountNumber"  column="BANK_ACCT_NUM" type="string"/>
        <property name="inspectionAtLookup"  column="INSPECTION_AT_LKP" type="string"/>

        <property  name="lastUpdate" column="LAST_UPDATE_DATE" type="timestamp"></property>
        <property name="createByUserId" column="CREATED_BY" type="java.lang.Long"/>
        <property name="creationDate" column="CREATION_DATE" type="timestamp"/>
        <property name="lastUpdatedByUserId" column="LAST_UPDATED_BY" type="java.lang.Long"/>

        <many-to-one name="rfq"
               class="com.cgc.esd.purchasing.RFQ"
               column="RFQ_ID" not-null="true"/>

        <many-to-one name="rfqSupplier"
               class="com.cgc.esd.purchasing.RFQSupplier"
               column="SUPL_ID"  not-null="true"/>

        <bag name="suppliedItems" table="CPO_QUOT_SUPL_ITEMS"
              lazy="true" cascade="all-delete-orphan" inverse="true"
              outer-join="auto">
          <key column="QUOT_ID"/>
     <one-to-many class="com.cgc.esd.purchasing.QuotationSuppliedItem"/>
        </bag>

 </class>

</hibernate-mapping>

[/code]

g1friend · **Joined:** Thu Sep 18, 2003 1:50 am **Posts:** 17

Remove the proxy attribute of the class.

trebiani · **Posted:** Tue Apr 27, 2004 4:25 am

I tried to serialize a hibernate-persistent Class with the java.beans.XMLEncoder and i get the folowing errors:

java.lang.IllegalAccessException: Class java.beans.Statement can not access a member of class net.sf.hibernate.impl.SessionImpl$CollectionEntry with modifiers ""
Continuing ...
java.lang.RuntimeException: failed to evaluate: <unbound>=SessionImpl$CollectionEntry.new();
Continuing ...
java.lang.IllegalAccessException: Class java.beans.Statement can not access a member of class net.sf.hibernate.impl.SessionImpl$CollectionEntry with modifiers ""
Continuing ...
java.lang.RuntimeException: failed to evaluate: <unbound>=SessionImpl$CollectionEntry.new();
Continuing ...
java.lang.IllegalAccessException: Class java.beans.Statement can not access a member of class net.sf.hibernate.impl.SessionImpl$CollectionEntry with modifiers ""
Continuing ...
java.lang.RuntimeException: failed to evaluate: <unbound>=SessionImpl$CollectionEntry.new();
Continuing ...

Any hints?

kic · **Joined:** Wed Jan 28, 2004 2:06 am **Posts:** 33

I am also facing the same problem. Can u guys help me out how u solved the problem. I am keeping the session open... still i get an exception