An exception when building

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An exception when building

Ganath Rathnayake
Hi all,
Hi all I talk about this exception before with Erwan in the code you find it
in[1]. You can find it in [2].
I went through the exception and found out that this can cause by two
reasons,
1. Iterator<? extends Factory<R, A>> it =
ServiceLoader.load(factoryInterface).iterator();
2. No matching factory instance for obj.
(R instance = factory.getInstance(obj);)

My problem is, what can be the reason for this exception?
--
thanks
Ganath

[1]. https://github.com/ganathr/ofbiz
[2].
[java] 2011-07-03 09:28:41,574 (main) [   DelegatorFactory.java:53 :ERROR]
     [java] ---- exception report
----------------------------------------------------------
     [java] Exception in thread "main" java.lang.NullPointerException
     [java] Exception: java.lang.ClassNotFoundException
     [java] Message: java.lang.Class
     [java] ---- stack trace
---------------------------------------------------------------
     [java]     at
java.util.concurrent.ConcurrentHashMap.putIfAbsent(ConcurrentHashMap.java:895)
     [java] java.lang.ClassNotFoundException: java.lang.Class
     [java]
org.ofbiz.base.util.UtilObject.getObjectFromFactory(UtilObject.java:207)
     [java]
org.ofbiz.entity.DelegatorFactory.getDelegator(DelegatorFactory.java:51)
     [java]
org.ofbiz.entityext.data.EntityDataLoadContainer.start(EntityDataLoadContainer.java:229)
     [java]
org.ofbiz.base.container.ContainerLoader.start(ContainerLoader.java:230)
     [java]     at
org.ofbiz.entity.DelegatorFactory.getDelegator(DelegatorFactory.java:56)
     [java] org.ofbiz.base.start.Start.startStartLoaders(Start.java:247)
     [java] org.ofbiz.base.start.Start.start(Start.java:226)
     [java]     at
org.ofbiz.entityext.data.EntityDataLoadContainer.start(EntityDataLoadContainer.java:229)
     [java] org.ofbiz.base.start.Start.main(Start.java:70)
     [java]
--------------------------------------------------------------------------------
     [java]     at
org.ofbiz.base.container.ContainerLoader.start(ContainerLoader.java:230)
     [java]
     [java]     at
org.ofbiz.base.start.Start.startStartLoaders(Start.java:247)
     [java]     at org.ofbiz.base.start.Start.start(Start.java:226)
     [java]     at org.ofbiz.base.start.Start.main(Start.java:70)
     [java] 2011-07-03 09:28:41,588 (Thread-0) [
ContainerLoader.java:246:INFO ] Shutting down containers
     [java] Java Result: 1