java.lang.NullPointerException when trying to create an empty dat a graph

[Scott Kurinskas <sc...@gemstone.com>]

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", "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

Re: java.lang.NullPointerException when trying to create an empty dat a graph

[Hasan Muhammad <as...@us.ibm.com>]

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."


                                                                           
             Scott Kurinskas                                               
             <scott.kurinskas@                                             
             gemstone.com>                                              To 
                                       tuscany-user@ws.apache.org          
             08/14/2006 08:03                                           cc 
             PM                                                            
                                                                   Subject 
                                       java.lang.NullPointerException when 
             Please respond to         trying to create an empty dat   a   
             tuscany-user@ws.a         graph                               
                 pache.org                                                 
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           




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", "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