How to instantiate a BDM object

Submitted by Smoltok on Wed, 02/18/2015 - 09:43
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Hi,

I would like to use a BDM object but how to instantiate it correctly ?

I have the following error : Impossible to get data of type (name of object) with a null identifier"

Any clue ?

Comments

Submitted by Smoltok on Wed, 02/18/2015 - 10:35

Ok, maybe it 's working with a groovy script which return a new Object.

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1 answer

Submitted by romain.bioteau on Thu, 02/19/2015 - 11:39
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An automatic instantiation of business data are done the first time a setter is called (using a Java Method operator in a operation). If you use a Groovy Expression, you can use the following code

myBusinessObjectDAO.newInstance('some mandatory attribute')

Comments

Submitted by Smoltok on Thu, 02/19/2015 - 12:19

Ok may be within the operation tab. However there is no newInstance method in the DAO interface.

And after init the object, I have this : javax.persistence.PersistenceException : "org.hibernate.PropertyAccessException: could not get a field value by reflection getter of TestOne.persistenceId"

Any idea ?

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Submitted by romain.bioteau on Thu, 02/19/2015 - 14:10

What version of BonitaBPM are you using ?

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Submitted by Smoltok on Thu, 02/19/2015 - 14:10

6.3.8

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Submitted by romain.bioteau on Thu, 02/19/2015 - 14:17

ok, snippet above is available in 6.4+ then instantiate like this :

def newBoInstance = new MyBusinessObject()
newBoInstance .setMandatoryField1()
newBoInstance .setMandatoryField2()
return newBoInstance;

Be carefull that your script does not reference the business data you want to instantiate. That may lead to the above error. (eg; if your business data is called 'testData', don't use testData as variable in your script)

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Submitted by Smoltok on Thu, 02/19/2015 - 14:37

Ok I understand, but it doesn't work anyway. I have tried also in 6.4.2 Always the same error (like above)

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Submitted by Smoltok on Thu, 02/19/2015 - 15:05

Here is more complete error in 6.4.2 :

Caused by: org.hibernate.PropertyAccessException: could not get a field value by reflection getter of FIRHDataUser.persistenceId at org.hibernate.property.DirectPropertyAccessor$DirectGetter.get(DirectPropertyAccessor.java:62) at org.hibernate.tuple.entity.AbstractEntityTuplizer.getIdentifier(AbstractEntityTuplizer.java:344) at org.hibernate.persister.entity.AbstractEntityPersister.getIdentifier(AbstractEntityPersister.java:4550) at org.hibernate.event.internal.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:129) at org.hibernate.event.internal.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:76) at org.hibernate.internal.SessionImpl.fireMerge(SessionImpl.java:833) at org.hibernate.internal.SessionImpl.merge(SessionImpl.java:817) at org.hibernate.internal.SessionImpl.merge(SessionImpl.java:821) at org.hibernate.ejb.AbstractEntityManagerImpl.merge(AbstractEntityManagerImpl.java:889) ... 28 more Caused by: java.lang.IllegalArgumentException: Can not set java.lang.Long field FIRHDataUser.persistenceId to FIRHDataUser at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(Unknown Source) at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(Unknown Source) at sun.reflect.UnsafeFieldAccessorImpl.ensureObj(Unknown Source) at sun.reflect.UnsafeObjectFieldAccessorImpl.get(Unknown Source) at java.lang.reflect.Field.get(Unknown Source) at org.hibernate.property.DirectPropertyAccessor$DirectGetter.get(DirectPropertyAccessor.java:59) ... 36 more

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