Scott,
a couple of things ...
there's no evidence in your test case of defining your type system. To
create any DataObject there must be an instance of commonj.sdo.Type that is
accessible. No DataObject can exist without a Type. The ChangeSummary test
case you mention creates these Type instances in its setup routine with ...
protected void setUp() throws Exception {
super.setUp();
// Populate the meta data for the test (Stock Quote) model
URL url = getClass().getResource(TEST_MODEL);
InputStream inputStream = url.openStream();
XSDHelper.INSTANCE.define(inputStream, url.toString());
inputStream.close();
}
by supplying an xml schema which SDO can convert into Types. Only after
this can DataObjects relating to the types defined in the schema be
created.
If I understand your problem correctly you'll need to have something like
the xml schema referenced by the TEST_MODEL constant, adapted for your
needs.
also your namespace looks a bit funny in this posting, perhaps thats your
email client trying to be clever, but
" <http://www.example.com/sample>
http://www.example.com/sample";;
is not a valid namespace -- you just need the single URL "
http://www.example.com/sample";;
By the way, programs using dynamic type definition in this way (as opposed
to generaing Java classes) do not fall foul of the current problems of SDO
initialization mentioned earlier in this thread. It's only in some cases
using generated Java classes that we sometimes have to add the explicit call
to DataObjectUtil.initRuntime()
Regards, Kelvin.
On 16/08/06, Scott Kurinskas <[EMAIL PROTECTED]> wrote:
Thanks Hasan.
I tried this but I receive the exact same exception. I've also tried
other
mechanisms to initiate the SDO runtime (DataObjectUtil.initRuntime();) to
no
avail. I realize this has to be a trivial issue, but I'm stumped. Below
is
the little class I'm using.
import org.apache.tuscany.sdo.util.DataObjectUtil;
import org.apache.tuscany.sdo.util.SDOUtil;
import commonj.sdo.ChangeSummary;
import commonj.sdo.DataGraph;
import commonj.sdo.DataObject;
import commonj.sdo.helper.DataFactory;
import commonj.sdo.helper.TypeHelper;
import commonj.sdo.Type;
public class SDOTest {
/**
* @param args
*/
static final String CUSTOMER_NAMESPACE = " <http://www.example.com/sample>
http://www.example.com/sample";;
public static void main(String[] args) {
// TODO Auto-generated method stub
SDOUtil.createTypeHelper();
//DataObjectUtil.initRuntime();
try {
DataGraph dataGraph = SDOUtil.createDataGraph();
DataObject customer = dataGraph.createRootObject("
<http://www.example.com/simple> http://www.example.com/simple";,
"Customer");
if (customer == null) {
System.out.println("dobj is null");
}
else {
customer.setString("firstName", "scott");
System.out.println("first name = " + customer.getString("firstName"));
}
}
catch (Exception e)
{
e.printStackTrace();
}
}
}
_____
From: Hasan Muhammad [mailto:[EMAIL PROTECTED]
Sent: Tuesday, August 15, 2006 9:23 AM
To: [email protected]
Subject: Re: java.lang.NullPointerException when trying to create an empty
dat a graph
Hi Scott,
It looks like the SDO Runtime did not get initialized prior to creating
the
DataGraph. If so, it would most likely fail to get the right SDO Factory
and
hence could return a null object for the DataGraph. Hence the
NullPointerException.
You could initiate the SDO Runtime simply by inserting the following line
in
the beginning before any SDO calls..
SDOUtil.createTypeHelper();
regards
Hasan Muhammad
Allah's Messenger Muhammad (Pbuh) said, "While a man was on the way, he
found a thorny branch of a tree there on the way and removed it. Allah
thanked him for that deed and forgave him."
Inactive hide details for Scott Kurinskas
<[EMAIL PROTECTED]>Scott Kurinskas <
[EMAIL PROTECTED]>
Scott Kurinskas <[EMAIL PROTECTED]>
08/14/2006 08:03 PM
Please respond to
[email protected]
To
[email protected]
cc
Subject
java.lang.NullPointerException when trying to create an empty dat a graph
Hi-
I'm trying to put togther a very simple example constructing an empty
DataObject. Its very similar to the ChangeSummary test case. However,
whenever I try to construct an empty DataObject, I receive a null pointer
exception. My example is below. Its failing on 'DataObject customer
...'.
I do not understand why this exception occurs. Any assistance would be
greatly appreciated.
try {
DataGraph dataGraph = SDOUtil.createDataGraph();
DataObject customer =
dataGraph.createRootObject("http://www.example.com/simple
<http://www.example.com/simple> ", "Customer");
...
Exception:
java.lang.NullPointerException
at org.eclipse.emf.ecore.util.EcoreUtil.create(EcoreUtil.java:2918)
at
org.apache.tuscany.sdo.util.DataObjectUtil.create(DataObjectUtil.java
:2324)
at
org.apache.tuscany.sdo.impl.DataGraphImpl.createRootObject(
DataGraphImpl.jav
a:594)
at gemfire.example.customer.sdo.SDOTest.main(SDOTest.java:21)
Regards,
Scptt
--
Best Regards
Kelvin Goodson
