Re: [eclipselink-users] Virtual Metlhods | questions

[gaurav malhotra <gaurav.malhotra@xxxxxxxxxx>]

Hi Chris,
  It's the requirement of my product - Dynamic Fields can be configured 
at the runtime and should be picked up in live application with zero 
down time. Its for the dynamic fields I am creating the mappings.
  How to accomplish above reqirement?

~Gaurav
On 24-07-2012 11:29 PM, Christopher Delahunt wrote:
> This would occur if the mapping has not been initialized; 
> initialization occurs during session login.  Earlier posts showed 
> mappings being added through a session customizer which get called 
> prior to login.  How and when is this mapping added?
>
> Calling refreshMetadata as Tom mentions creates a new session from the 
> metadata, and would call customizers on it before logging in. If your 
> customizer picks up the new mapping changes, then that might explain 
> why it works for you, since they get initialized with the new session 
> login.
>
> It is not a good idea to make mapping/descriptor changes to active 
> sessions after login has occurred.
>
> On 24/07/2012 5:05 PM, gaurav malhotra wrote:
> > ava.lang.NullPointerException
> >      at
> > org.eclipse.persistence.mappings.ForeignReferenceMapping.valueFromRowInternal(ForeignReferenceMapping.java:2019) 
> >
> >
> >      at
> > org.eclipse.persistence.mappings.ForeignReferenceMapping.valueFromRow(ForeignReferenceMapping.java:1987) 
> >
> >
> >      at
> > org.eclipse.persistence.mappings.ForeignReferenceMapping.buildCloneFromRow(ForeignReferenceMapping.java:276) 
> >
> >
> >      at
> > org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildAttributesIntoWorkingCopyClone(ObjectBuilder.java:1548) 
> >
> >
> >      at
> > org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildWorkingCopyCloneFromRow(ObjectBuilder.java:1694) 
> >
> >
> >      at
> > org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObjectInUnitOfWork(ObjectBuilder.java:664) 
> >
> >
> >      at
> > org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObject(ObjectBuilder.java:601) 
> >
> >
> >      at
> > org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObject(ObjectBuilder.java:560) 
> >
> >
> >      at
> > org.eclipse.persistence.queries.ObjectLevelReadQuery.buildObject(ObjectLevelReadQuery.java:717) 
> >
> >
> >      at
> > org.eclipse.persistence.queries.ReadAllQuery.registerResultInUnitOfWork(ReadAllQuery.java:769) 
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