What cause the following errors being thrown?
The following code is used, where prUpdate is of class PrBO and have one
to many relationship with PrItemBO class.
 
 
            db.open(site.getRepository(), Database.OPEN_READ_WRITE);
            tx = odmg.newTransaction();
            tx.begin();
            tx.lock(prUpdate,tx.WRITE);
            tx.commit();
 
Can someone please help??? 
 
Thanks in advance!
 
regards,
Stephen
 
[DEFAULT] ERROR: Error in operation [set] of object
[PersistentFieldPropertyImpl], java.lang.IllegalArgumentException
[DEFAULT] ERROR: Declaring class
[my.com.shinyang.einout.business.bo.PrItemBO]
[DEFAULT] ERROR: Property Name [prNo]
[DEFAULT] ERROR: Property Type [java.lang.String]
[DEFAULT] ERROR: anObject was class
[my.com.shinyang.einout.purchase.requisition.view.PrItemView]
[DEFAULT] ERROR: aValue was class [java.lang.String]
[org.apache.ojb.odmg.TransactionImpl] ERROR: Locking obj
my.com.shinyang.einout.business.bo.PrBO@694f12 with lock mode 4 failed
null
org.apache.ojb.broker.PersistenceBrokerException
 at
org.apache.ojb.broker.metadata.PersistentFieldPropertyImpl.set(Unknown
Source)
 at org.apache.ojb.odmg.TransactionImpl.lockCollections(Unknown Source)
 at org.apache.ojb.odmg.TransactionImpl.register(Unknown Source)
 at org.apache.ojb.odmg.TransactionImpl.lock(Unknown Source)
 at
my.com.shinyang.einout.business.PurchaseRequisitionDelegateImpl.updatePR
(PurchaseRequisitionDelegateImpl.java:334)
 at
my.com.shinyang.einout.purchase.requisition.PurchaseApprovalEditAction.u
pdate(PurchaseApprovalEditAction.java:129)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.jav
a:39)
 at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor
Impl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:324)
 at
org.apache.struts.actions.DispatchAction.dispatchMethod(DispatchAction.j
ava:280)
 at
org.apache.struts.actions.DispatchAction.execute(DispatchAction.java:220
)
 at
org.apache.struts.action.RequestProcessor.processActionPerform(RequestPr
ocessor.java:446)
 at
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:
266)
 at
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1292)
 at
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:510)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
 at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica
tionFilterChain.java:247)
 at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt
erChain.java:193)
 at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValv
e.java:260)
 at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i
nvokeNext(StandardPipeline.java:643)
 at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:4
80)
 at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
 at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValv
e.java:191)
 at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i
nvokeNext(StandardPipeline.java:643)
 at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(Authenticator
Base.java:527)
 at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i
nvokeNext(StandardPipeline.java:641)
 at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:4
80)
 at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
 at
org.apache.catalina.core.StandardContext.invoke(StandardContext.java:235
0)
 at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java
:180)
 at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i
nvokeNext(StandardPipeline.java:643)
 at
org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherVa
lve.java:170)
 at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i
nvokeNext(StandardPipeline.java:641)
 at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java
:171)
 at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i
nvokeNext(StandardPipeline.java:641)
 at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:4
80)
 at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
 at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.
java:174)
 at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i
nvokeNext(StandardPipeline.java:643)
 at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:4
80)
 at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
 at
org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:223)
 at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:40
5)
 at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processC
onnection(Http11Protocol.java:380)
 at
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:50
8)
 at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool
.java:533)
 at java.lang.Thread.run(Thread.java:536)
Caused by: java.lang.IllegalArgumentException: object is not an instance
of declaring class
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.jav
a:39)
 at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor
Impl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:324)
 ... 49 more


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