Hi!
I had solved this problem. And I feel myself very unpleasantly because
I just had to read the FAQ. If I use everywhere get-method / set-emthod
instead of field then its working fine.
Cheers,
Kiss
Zoltán
>
>
>
> Hi!
>
> I'm trying to marshall hibernate persisted java object graph with
JiBX,
> but I have found that lazy many-to-one fields won't be marshalled, or
in
> some circumstances it generates exceptions.
>
> I made a very small example where I only have two tables (PARTNER for
> store people 'names', and PARTNER_RELATION to store a named relation
of
> two people).
>
> My hbm.xml files are at the end of the mail, as the binding.xml too.
>
> If I change the fetch attribute to "join" (or the lazy to
> "false") in the many-to-one fields then the marshalled
document
> will contains the many to one structures too. Eg.:
>
> <?xml version="1.0" encoding="UTF-8"?>
>
> <partner>
>
> <id>11</id>
>
> <nev>John Smith</nev>
>
> <leftRelations>
>
> <partner-relation>
>
> <id>22</id>
>
>
> <relationType>friend</relationType>
>
> <leftRelation>
>
> <id>11</id>
>
> <nev>John
> Smith</nev>
>
> </leftRelation>
>
> <rightRelation> <!-- NOW IT
IS NOT
> LAZY -->
>
> <id>10</id>
>
> <nev>Andrew
> Jackson</nev>
>
> </rightRelation>
>
> </partner-relation>
>
> </leftRelations>
>
> </partner>
>
> But if the fields are lazy, then the other end of the relation will
be
> an empty tag. Eg.:
>
> <?xml version="1.0" encoding="UTF-8"?>
>
> <partner>
>
> <id>11</id>
>
> <nev>John Smith</nev>
>
> <leftRelations>
>
> <partner-relation>
>
> <id>22</id>
>
>
> <relationType>friend</relationType>
>
> <leftRelation>
>
> <id>11</id>
>
> <nev>John
> Smith</nev>
>
> </leftRelation>
>
> <rightRelation/> <!--
EMPTY
> AND IT IS LAZY -->
>
> </partner-relation>
>
> </leftRelations>
>
> </partner>
>
> The lazy fields won't be marshalled even if I try to use
> "get-method"/"set-method" attributes in the
> binding.xml (see commented line in binding.xml) in place of
> "field" attribute. But the getter method of the lazy fields
will
> be called in both case, because I write into the log in the method!
But
> there is no output for this fields.
>
> Even if I load this lazy many-to-one fields indirectly with hibernate
(I
> walk the object graph from java) before marshalling, JiBX won't
write
> them out!
>
> If I try to remove the usage="optional" attribute from the
> fields of the abstract Partner mapping, then I got exceptions.
>
> If the "id" is not optional then I got this:
>
> java.lang.NullPointerException
>
> at
>
hu.freesoft.xmldemo.Partner.JiBX_xmldemo_binding_marshal_1_7(Partner.java)
>
> at
>
hu.freesoft.xmldemo.PartnerRelation.JiBX_xmldemo_binding_marshal_1_2(PartnerRelation.java)
>
> at
>
hu.freesoft.xmldemo.JiBX_xmldemo_bindingPartnerRelation_access.marshal()
>
> at
>
hu.freesoft.xmldemo.JiBX_MungeAdapter.JiBX_xmldemo_binding_marshal_1_1()
>
> at
>
hu.freesoft.xmldemo.Partner.JiBX_xmldemo_binding_marshal_1_6(Partner.java)
>
> at
> hu.freesoft.xmldemo.JiBX_xmldemo_bindingPartner_access.marshal()
>
> at
> hu.freesoft.xmldemo.Partner.marshal(Partner.java)
>
> at
> org.jibx.runtime.impl.MarshallingContext.marshalRoot(UnknownSource)
>
> at
> org.jibx.runtime.impl.MarshallingContext.marshalDocument(Unknown
> Source)
>
> If only the "name" is not optional, then I got this:
>
> org.jibx.runtime.JiBXException: null value for element
> "name" from object of type
> xmldemo.Partner$$EnhancerByCGLIB$$a04007f4
>
> at
> org.jibx.runtime.impl.MarshallingContext.element(Unknown Source)
>
> at
> xmldemo.Partner.JiBX_xmldemo_binding_marshal_1_5(Partner.java)
>
> at
>
xmldemo.PartnerRelation.JiBX_xmldemo_binding_marshal_1_1(PartnerRelation.java)
>
> at
> xmldemo.JiBX_xmldemo_bindingPartnerRelation_access.marshal()
>
> at
> xmldemo.JiBX_MungeAdapter.JiBX_xmldemo_binding_marshal_1_1()
>
> at
> xmldemo.Partner.JiBX_xmldemo_binding_marshal_1_3(Partner.java)
>
> at
> xmldemo.JiBX_xmldemo_bindingPartner_access.marshal()
>
> at
xmldemo.Partner.marshal(Partner.java)
>
> at
> org.jibx.runtime.impl.MarshallingContext.marshalRoot(UnknownSource)
>
> at
> org.jibx.runtime.impl.MarshallingContext.marshalDocument(Unknown
> Source)
>
> Have someone meet with similar problems? Is there any solution for
it?
>
> Cheers,
>
> Kiss Zoltán
>
> ---------------------------------------
>
> The binding.xml file is:
>
> <binding forwards="false"
> value-style="element">
>
> <mapping
> class="xmldemo.Partner" name="partner">
>
> <structure
> map-as="partner-type"/>
>
> <collection
> name="leftRelations" field="leftRelations"
> item-type="xmldemo.PartnerRelation"
> factory="xmldemo.Partner.setFactory" />
>
> <collection
> name="rightRelations" field="rightRelations"
> item-type="xmldemo.PartnerRelation"
> factory="xmldemo.Partner.setFactory" />
>
> </mapping>
>
> <mapping
> class="xmldemo.Partner" abstract="true"
> type-name="partner-type">
>
> <value
name="id"
> field="id" usage="optional"/>
>
> <value
name="name"
> field="nev" usage="optional" />
>
> </mapping>
>
> <mapping
> class="xmldemo.PartnerRelation"
> name="partner-relation">
>
> <value
name="id"
> field="id"/>
>
> <value
> name="relationType" field="relationType" />
>
> <!-- get-method /
set-method
> even not working for lazy field -->
>
> <!--structure
> get-method="getLeftPartner"
> set-method="setLeftPartner" name="leftRelation"
> map-as="partner-type" /-->
>
> <structure
> field="leftPartner" name="leftRelation"
> map-as="partner-type" />
>
> <structure
> field="rightPartner" name="rightRelation"
> map-as="partner-type" />
>
> </mapping>
>
> </binding>
>
> The hbm.xmls:
>
> <hibernate-mapping
> default-cascade="none">
>
> <class
> name="xmldemo.Partner" table="PARTNER"
> dynamic-insert="false" dynamic-update="false">
>
>
<id
> name="id" type="java.lang.Long"
> unsaved-value="null">
>
>
> <column name="ID" sql-type="NUMBER(19)"/>
>
>
> <generator class="native"></generator>
>
>
> </id>
>
>
> <property name="name"
> type="java.lang.String">
>
>
> <column name="NAME" not-null="true"
> sql-type="VARCHAR2(128)"/>
>
>
> </property>
>
>
<set
> name="leftRelations" inverse="true">
>
>
> <key><column name="LEFT_PARTNER_FK"
> sql-type="NUMBER(19)" not-null="true"
> /></key>
>
>
> <one-to-many class="xmldemo.PartnerRelation" />
>
>
> </set>
>
>
<set
> name="rightRelations" inverse="true">
>
>
> <key><column name="RIGHT_PARTNER_FK"
> sql-type="NUMBER(19)" not-null="true"
> /></key>
>
>
> <one-to-many class="xmldemo.PartnerRelation" />
>
>
> </set>
>
> </class>
>
> </hibernate-mapping>
>
> <hibernate-mapping
> default-cascade="none">
>
> <class
> name="xmldemo.PartnerRelation"
> table="PARTNER_RELATION" dynamic-insert="false"
> dynamic-update="false">
>
>
<id
> name="id" type="java.lang.Long"
> unsaved-value="null">
>
>
> <column name="ID" sql-type="NUMBER(19)"/>
>
>
> <generator class="native"></generator>
>
>
> </id>
>
>
> <property name="relationType"
> type="java.lang.String">
>
>
> <column name="RELATION_TYPE" not-null="true"
> unique="false" sql-type="VARCHAR2(128)"/>
>
>
> </property>
>
>
> <many-to-one name="leftPartner"
> class="hu.freesoft.xmldemo.Partner" lazy="proxy"
> fetch="select">
>
>
> <column name="LEFT_PARTNER_FK" not-null="true"
> sql-type="NUMBER(19)"/>
>
>
> </many-to-one>
>
>
> <many-to-one name="rightPartner"
> class="hu.freesoft.xmldemo.Partner" lazy="proxy"
> fetch="select">
>
>
> <column name="RIGHT_PARTNER_FK"
not-null="true"
> sql-type="NUMBER(19)"/>
>
>
> </many-to-one>
>
> </class>
>
> </hibernate-mapping>
>
>
>
>
>
>
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