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JPA Clone ISSue #10

Closed GoogleCodeExporter closed 9 years ago

GoogleCodeExporter commented 9 years ago 
What steps will reproduce the problem?
1.Use JPA Entities 
2.Make a clone of your JPA entity
3.

What is the expected output? What do you see instead?
An object cloned from my JPA entity, but I got an infinity loop of cloning, it 
clone so much class (configuration classes and others uses on mapping)

What version of the product are you using? On what operating system?

1.8.1

Please provide any additional information below.
It works fine on normal objects, but not on JPA objects (entities) even 
detached entities.

Original issue reported on code.google.com by ayadi.ak...@gmail.com on 1 Aug 2012 at 1:41

GoogleCodeExporter commented 9 years ago 
did you tried null instead of clone? I.e. for hibernate/spring you might do 
something like:

cloner.nullInsteadOfClone(SessionImplementor.class, JDBCTransaction.class, 
SessionImpl.class);

also you might want to

cloner.setDumpClonedClasses(true);

this will print all cloned classes and then you can nullInsteadOfClone those 
that you don't want to be cloned. Or you can registerImmutable() those.

http://code.google.com/p/cloning/wiki/Usage

Please let me know if that's ok and we can close the issue.

Original comment by kostas.k...@googlemail.com on 1 Aug 2012 at 7:06

GoogleCodeExporter commented 9 years ago 
hi,

First of all, I wanna thank you for your response.

Actually I have a lot of classes of configuration (I use EclipseLink as
ORM)  that I don't wanna clone them, for example,

cloned field>protected
org.eclipse.persistence.internal.helper.DatabaseTable
org.eclipse.persistence.internal.helper.DatabaseField.table  -- of class
class org.eclipse.persistence.internal.helper.DatabaseField
cloned field>protected java.lang.Object[] java.util.Vector.elementData  --
of class class org.eclipse.persistence.internal.helper.NonSynchronizedVector
cloned field>protected transient java.util.Vector
org.eclipse.persistence.mappings.OneToManyMapping.targetForeignKeyFields
-- of class class org.eclipse.persistence.mappings.OneToManyMapping
clone>class org.eclipse.persistence.internal.helper.NonSynchronizedVector
clone>class [Ljava.lang.Object;
clone>class org.eclipse.persistence.internal.helper.DatabaseField
clone>class org.eclipse.persistence.internal.helper.DatabaseTable
cloned field>protected
org.eclipse.persistence.internal.helper.DatabaseTable
org.eclipse.persistence.internal.helper.DatabaseField.table  -- of class
class org.eclipse.persistence.internal.helper.DatabaseField
cloned field>protected java.lang.Object[] java.util.Vector.elementData  --
of class class org.eclipse.persistence.internal.helper.NonSynchronizedVector
cloned field>protected transient java.util.Vector
org.eclipse.persistence.mappings.OneToManyMapping.sourceKeyFields  -- of
class class org.eclipse.persistence.mappings.OneToManyMapping
cloned field>protected transient java.util.Map
org.eclipse.persistence.mappings.OneToManyMapping.targetForeignKeysToSourceKeys
-- of class class org.eclipse.persistence.mappings.OneToManyMapping
cloned field>protected transient java.util.Map
org.eclipse.persistence.mappings.OneToManyMapping.sourceKeysToTargetForeignKeys
-- of class class org.eclipse.persistence.mappings.OneToManyMapping
clone>class org.eclipse.persistence.queries.DataModifyQuery
cloned field>protected transient
org.eclipse.persistence.queries.DataModifyQuery
org.eclipse.persistence.mappings.OneToManyMapping.removeTargetQuery  -- of
class class org.eclipse.persistence.mappings.OneToManyMapping
clone>class org.eclipse.persistence.queries.DataModifyQuery
cloned field>protected transient
org.eclipse.persistence.queries.DataModifyQuery
org.eclipse.persistence.mappings.OneToManyMapping.removeAllTargetsQuery  --
of class class org.eclipse.persistence.mappings.OneToManyMapping
clone>class org.eclipse.persistence.queries.DeleteAllQuery
clone>class
org.eclipse.persistence.internal.queries.ExpressionQueryMechanism
clone>class org.eclipse.persistence.internal.expressions.RelationExpression
clone>class org.eclipse.persistence.expressions.ExpressionOperator
clone>class [Ljava.lang.String;
cloned field>protected java.lang.String[]
org.eclipse.persistence.expressions.ExpressionOperator.databaseStrings  --
of class class org.eclipse.persistence.expressions.ExpressionOperator
clone>class [Ljava.lang.String;
cloned field>protected java.lang.String[]
org.eclipse.persistence.expressions.ExpressionOperator.javaStrings  -- of
class class org.eclipse.persistence.expressions.ExpressionOperator
cloned field>protected
org.eclipse.persistence.expressions.ExpressionOperator
org.eclipse.persistence.internal.expressions.CompoundExpression.operator
-- of class class
org.eclipse.persistence.internal.expressions.RelationExpression
clone>class org.eclipse.persistence.internal.expressions.FieldExpression
cloned field>protected
org.eclipse.persistence.internal.helper.DatabaseField
org.eclipse.persistence.internal.expressions.FieldExpression.field  -- of
class class org.eclipse.persistence.internal.expressions.FieldExpression
clone>class org.eclipse.persistence.expressions.ExpressionBuilder
clone>class org.eclipse.persistence.internal.helper.NonSynchronizedVector
clone>class [Ljava.lang.Object;
cloned field>protected java.lang.Object[] java.util.Vector.elementData  --
of class class org.eclipse.persistence.internal.helper.NonSynchronizedVector
cloned field>protected java.util.Vector
org.eclipse.persistence.internal.expressions.DataExpression.derivedFields
-- of class class org.eclipse.persistence.expressions.ExpressionBuilder
cloned field>protected org.eclipse.persistence.expressions.Expression
org.eclipse.persistence.internal.expressions.BaseExpression.baseExpression
-- of class class
org.eclipse.persistence.internal.expressions.FieldExpression
cloned field>protected
org.eclipse.persistence.expressions.ExpressionBuilder
org.eclipse.persistence.internal.expressions.BaseExpression.builder  -- of
class class org.eclipse.persistence.internal.expressions.FieldExpression
cloned field>protected org.eclipse.persistence.expressions.Expression
org.eclipse.persistence.internal.expressions.CompoundExpression.firstChild
-- of class class
org.eclipse.persistence.internal.expressions.RelationExpression
clone>class org.eclipse.persistence.internal.expressions.ParameterExpression
cloned field>protected
org.eclipse.persistence.internal.helper.DatabaseField
org.eclipse.persistence.internal.expressions.ParameterExpression.field  --
of class class
org.eclipse.persistence.internal.expressions.ParameterExpression
cloned field>protected org.eclipse.persistence.expressions.Expression
org.eclipse.persistence.internal.expressions.ParameterExpression.localBase
-- of class class
org.eclipse.persistence.internal.expressions.ParameterExpression
cloned field>protected org.eclipse.persistence.expressions.Expression
org.eclipse.persistence.internal.expressions.CompoundExpression.secondChild
-- of class class
org.eclipse.persistence.internal.expressions.RelationExpression
cloned field>protected
org.eclipse.persistence.expressions.ExpressionBuilder
org.eclipse.persistence.internal.expressions.CompoundExpression.builder  --
of class class
org.eclipse.persistence.internal.expressions.RelationExpression
cloned field>protected org.eclipse.persistence.expressions.Expression
org.eclipse.persistence.internal.queries.ExpressionQueryMechanism.selectionCrite
ria
-- of class class
org.eclipse.persistence.internal.queries.ExpressionQueryMechanism
cloned field>protected org.eclipse.persistence.queries.DatabaseQuery
org.eclipse.persistence.internal.queries.DatabaseQueryMechanism.query  --
of class class
org.eclipse.persistence.internal.queries.ExpressionQueryMechanism
cloned field>protected
org.eclipse.persistence.internal.queries.DatabaseQueryMechanism
org.eclipse.persistence.queries.DatabaseQuery.queryMechanism  -- of class
class org.eclipse.persistence.queries.DeleteAllQuery
cloned field>protected transient
org.eclipse.persistence.queries.ModifyQuery
org.eclipse.persistence.mappings.CollectionMapping.deleteAllQuery  -- of
class class org.eclipse.persistence.mappings.OneToManyMapping
clone>class
org.eclipse.persistence.internal.queries.IndirectListContainerPolicy
clone>class org.eclipse.persistence.descriptors.RelationalDescriptor
cloned field>protected java.util.List
org.eclipse.persistence.descriptors.RelationalDescriptor.virtualAttributeMethods
-- of class class org.eclipse.persistence.descriptors.RelationalDescriptor
clone>class org.eclipse.persistence.internal.helper.NonSynchronizedVector

I tried
cloner.nullInsteadOfClone(org.eclipse.persistence.internal.helper.DatabaseTable.
class);

but doesnt work because it can regognize the  DatabaseTable class. all lib
are on the persistence layer and I am working on application layer.

What I have to do in this stade ?

Thanks in advance for your help,
Best Regards,
Akrem

-- 

Akrem AYADI

Expert Java/J2EE Consultant (certified)

Performance Engineer (certified)

Q&A Engineer

-------------------------------------------------------

Adresse:  16 Borgstraat 1850 Grimbergen Belgium

Phone; +32 485 05 52 04

Skype: ayadi.akrem.ensi

*P* please consider the environment before printing this email

Original comment by ayadi.ak...@gmail.com on 2 Aug 2012 at 7:33

GoogleCodeExporter commented 9 years ago 
hi, what do you mean "but doesnt work because it can regognize the  
DatabaseTable class"? Do you get a compilation error?

Regarding the persistence layer classes and cloner dump of those, see them as a 
tree of classes. Only a couple of them are on top of the tree and should be 
cloner.nullInsteadOfClone. If those are blocked then cloner won't visit the 
rest of the tree. I.e. I know for sure that for hibernate it is just a handful 
of classes that hibernate uses and it adds them to the proxies it returns.

An example: say your classes are C1 and C2. Now EclipseLink probably returns a 
C1Proxy class that contain a couple of fields:

C1Proxy.eclipseLinkField1
C1Proxy.eclipseLinkField2
.... and so on

If you debug your code, you will see those.

If you register their classes with cloner, then cloner can skip cloning them 
and will only clone your C1 and C2 entities.

Original comment by kostas.k...@googlemail.com on 2 Aug 2012 at 5:40

GoogleCodeExporter commented 9 years ago 
Akrem, should I close the issue?

Original comment by kostas.k...@googlemail.com on 19 Aug 2012 at 10:20

GoogleCodeExporter commented 9 years ago 
Yes, you can close it :)

Thank you for the support.

Best Regards,
Akrem

-- 

Akrem AYADI

Expert Java/J2EE Consultant (certified)

Performance Engineer (certified)

Q&A Engineer

-------------------------------------------------------

Adresse:  16 Borgstraat 1850 Grimbergen Belgium

Phone; +32 485 05 52 04

Skype: ayadi.akrem.ensi

*P* please consider the environment before printing this email

Original comment by ayadi.ak...@gmail.com on 20 Aug 2012 at 7:13

GoogleCodeExporter commented 9 years ago

Original comment by kostas.k...@googlemail.com on 20 Aug 2012 at 8:40