User application-id and existing schema: Enhancer doesn't work properly

Question

I want to use JDO, but I have an existing schema and I need to use my own
primary keys.
Unfortunately the documentation and examples show only one thing at a
time.
Either it describes how to use an existing schema or it shows how to use
application-controlled keys.
Below I pasted a simplified example which shows my problem.
Is there something obviously wrong in my setup? Do I forget something
maybe quite simple?
Thanks for any help - I am pretty much stuck here,
Claudia
Error:
======
Enhancing first seems to have worked fine.
But when using the enhanced classes in my business code (before
actually creating or querying) I get an error message which shows
that during the enhancement process something went wrong:
java.lang.VerifyError:
(class: DBEntry, method: jdoCopyKeyFieldsToObjectId signature:
(Ljavax/jdo/PersistenceCapable$ObjectIdFieldManager;Ljava/lang/Object;)V)
Bad type in putfield/putstatic
My package.jdo:
================
<?xml version="1.0"?>
<jdo>
<package name="de.erv.be.biz.conf.jdo">
<class name="DBEntry" identity-type="application"
objectid-class="MyObjectId">
<extension vendor-name="kodo" key="table" value="DB_TABLE"/>
<extension vendor-name="kodo" key="pk-column" value="ID"/>
<extension vendor-name="kodo" key="lock-column" value="none"/>
<extension vendor-name="kodo" key="class-column" value="none"/>
<field name="id" primary-key="true">
<extension vendor-name="kodo" key="id-data-column" value="ID"/>
</field>
<field name="data">
<extension vendor-name="kodo" key="data-column" value="DATA"/>
</field>
</class>
</package>
</jdo>
My class DBEntry which matches a table in the database:
=======================================================
package jdoTest;
import javax.jdo.*;
public class DBEntry{
private Long id;
private String data;
public void setId(Long p_id){
id = p_id;
public void setData(String p_data){
data = p_data;
public Long getId(){
return id;
public String getData(){
return data;
My class MyObjectId:
====================
public class MyObjectId{
public Long id;
public boolean equals(Object other){
          if (other == this)
               return true;
          if (!(other instanceof ObjectId))
               return false;
          ObjectId obj = (ObjectId) other;
          return this.id == obj.id;
public int hashCode(){
return id.hashCode();

Answer 1

The problem here is actually a bug in the 0.95 spec, which Kodo 2.2.x
implements. It has been resolved in the 1.0 spec. Keep an eye on this
newsgroup for an announcement of our 1.0-compliant beta sometime tomorrow.
To temporarily resolve the problem at hand, see
https://bugzilla.solarmetric.com/show_bug.cgi?id=123.
-Patrick
On 6/4/02 10:37 AM, "Claudia Bach" <[email protected]> wrote:
I want to use JDO, but I have an existing schema and I need to use my own
primary keys.
Unfortunately the documentation and examples show only one thing at a
time.
Either it describes how to use an existing schema or it shows how to use
application-controlled keys.
Below I pasted a simplified example which shows my problem.
Is there something obviously wrong in my setup? Do I forget something
maybe quite simple?
Thanks for any help - I am pretty much stuck here,
Claudia
Error:
======
Enhancing first seems to have worked fine.
But when using the enhanced classes in my business code (before
actually creating or querying) I get an error message which shows
that during the enhancement process something went wrong:
java.lang.VerifyError:
(class: DBEntry, method: jdoCopyKeyFieldsToObjectId signature:
(Ljavax/jdo/PersistenceCapable$ObjectIdFieldManager;Ljava/lang/Object;)V)
Bad type in putfield/putstatic
My package.jdo:
================
<?xml version="1.0"?>
<jdo>
<package name="de.erv.be.biz.conf.jdo">
<class name="DBEntry" identity-type="application"
objectid-class="MyObjectId">
<extension vendor-name="kodo" key="table" value="DB_TABLE"/>
<extension vendor-name="kodo" key="pk-column" value="ID"/>
<extension vendor-name="kodo" key="lock-column" value="none"/>
<extension vendor-name="kodo" key="class-column" value="none"/>
<field name="id" primary-key="true">
<extension vendor-name="kodo" key="id-data-column" value="ID"/>
</field>
<field name="data">
<extension vendor-name="kodo" key="data-column" value="DATA"/>
</field>
</class>
</package>
</jdo>
My class DBEntry which matches a table in the database:
=======================================================
package jdoTest;
import javax.jdo.*;
public class DBEntry{
private Long id;
private String data;
public void setId(Long p_id){
id = p_id;
public void setData(String p_data){
data = p_data;
public Long getId(){
return id;
public String getData(){
return data;
My class MyObjectId:
====================
public class MyObjectId{
public Long id;
public boolean equals(Object other){
if (other == this)
return true;
if (!(other instanceof ObjectId))
return false;
ObjectId obj = (ObjectId) other;
return this.id == obj.id;
public int hashCode(){
return id.hashCode();
Patrick Linskey [email protected]
SolarMetric Inc. http://www.solarmetric.com