Re: ClassCastException with getObjectByIdentity()
Chris Worley wrote:
In the following code I get a ClassCastException when querying for
the PartyGroup or Person. PartyGroup and Person both extend Party.
Party.partyTypeId will determine if the party is a person or party
group. If the party is one of the two then I want to get the party
group or person object and return it. However, when the code queries
a second time for the person or party group a ClassCastException
occurs. getObjectByIdeneity(...) is retruning an instance of CParty,
even though when the Identity was build I passed CPartyGroup.class as
the param no CParty.class.
If I modify the code not to query for CParty first and just query for
CPartyGroup I will get an instance of CPartyGroup. But, for some
reason by building the CParty identity first the second attempt for
CPartyGroup still returns an instance of CParty. and I have no
idea why.
Can anyone shed some light on what is going on and why I continue to
get an instance of CParty and not CPartyGroup or CPerson.
Which kind of inheritance do you use? In OJB <=1.0.3 there is a bug in
retrieve objects using "Mapping Classes on Multiple Joined Tables"
(see release notes, it's fixed in CVS OJB_1_0_RELEASE branch).
> CParty party = (CParty) getBroker().getObjectByIdentity(oid);
This call should return the correct object instance, no need to query
with the correct partyIdType again.
Could you post the metadata mapping for Party, Person, PartyGroup?
Here is the mapping for the tree class. I solved my problem by removing
the tags from the party descriptor.
You are using "Mapping Classes on Multiple Joined Tables", thus you
can't mix it with other inheritance strategies (e.g. using the
extent-class element) and if you use OJB <=1.0.3, you will get the
inheritance bug (see above).
You did mention that I
could do this in one query I an interested in knowing how.
In the next version of OJB this will be fixed (or try the
OJB_1_0_RELEASE branch from CVS) and
CParty party = (CParty) getBroker().getObjectByIdentity(oid);
will always return the correct object instance (CParty, CPartyGroup or
Person) and you can directly cast to the real party type.
regards,
Armin
regards,
Armin
// Find the party
Identity oid =
getBroker().serviceIdentity().buildIdentity(CParty.class, partyId);
CParty party = (CParty) getBroker().getObjectByIdentity(oid);
if (CParty.TYPE_PARTY_GROUP.equals(party.getPartyTypeId()))
{
// Get the Party Group
Identity partyGroupId =
getBroker().serviceIdentity().buildIdentity(CPartyGroup.class, partyId);
// ClastCastException here
CPartyGroup partyGroup = (CPartyGroup)
getBroker().getObjectByIdentity(partyGroupId);
setParameter("party", partyGroup);
}
else if (CParty.TYPE_PERSON.equals(party.getPartyTypeId()))
{
// Get the person
Identity personId =
getBroker().serviceIdentity().buildIdentity(CPerson.class, partyId);
// ClastCastException here
CPerson person = (CPerson) getBroker().getObjectByIdentity(personId);
setParameter("party", person);
}
else
{
setParameter("party", party);
}
-chris worley
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Re: ClassCastException with getObjectByIdentity()
Armin,
Hi Chris,
Chris Worley wrote:
In the following code I get a ClassCastException when querying for
the PartyGroup or Person. PartyGroup and Person both extend Party.
Party.partyTypeId will determine if the party is a person or party
group. If the party is one of the two then I want to get the party
group or person object and return it. However, when the code queries
a second time for the person or party group a ClassCastException
occurs. getObjectByIdeneity(...) is retruning an instance of CParty,
even though when the Identity was build I passed CPartyGroup.class as
the param no CParty.class.
If I modify the code not to query for CParty first and just query for
CPartyGroup I will get an instance of CPartyGroup. But, for some
reason by building the CParty identity first the second attempt for
CPartyGroup still returns an instance of CParty. and I have no
idea why.
Can anyone shed some light on what is going on and why I continue to
get an instance of CParty and not CPartyGroup or CPerson.
Which kind of inheritance do you use? In OJB <=1.0.3 there is a bug in
retrieve objects using "Mapping Classes on Multiple Joined Tables"
(see release notes, it's fixed in CVS OJB_1_0_RELEASE branch).
> CParty party = (CParty) getBroker().getObjectByIdentity(oid);
This call should return the correct object instance, no need to query
with the correct partyIdType again.
Could you post the metadata mapping for Party, Person, PartyGroup?
Here is the mapping for the tree class. I solved my problem by removing
the tags from the party descriptor. You did mention that I
could do this in one query I an interested in knowing how.
name="partyId"
column="party_id"
jdbc-type="integer"
primarykey="true"
autoincrement="true"
/>
name="partyTypeId"
column="party_type_id"
jdbc-type="varchar"
/>
name="partyId"
column="party_id"
jdbc-type="integer"
primarykey="true"
autoincrement="true"
/>
name="groupName"
column="group_name"
jdbc-type="varchar"
/>
class-ref="net.enterprise.common.model.party.CParty"
auto-retrieve="true"
auto-update="true"
>
name="partyId"
column="party_id"
jdbc-type="integer"
primarykey="true"
/>
name="firstName"
column="first_name"
jdbc-type="varchar"
/>
name="middleName"
column="middle_name"
jdbc-type="varchar"
/>
name="lastName"
column="last_name"
jdbc-type="varchar"
/>
class-ref="net.enterprise.common.model.party.CParty"
auto-retrieve="true"
auto-update="true"
auto-delete="true"
>
regards,
Armin
// Find the party
Identity oid =
getBroker().serviceIdentity().buildIdentity(CParty.class, partyId);
CParty party = (CParty) getBroker().getObjectByIdentity(oid);
if (CParty.TYPE_PARTY_GROUP.equals(party.getPartyTypeId()))
{
// Get the Party Group
Identity partyGroupId =
getBroker().serviceIdentity().buildIdentity(CPartyGroup.class, partyId);
// ClastCastException here
CPartyGroup partyGroup = (CPartyGroup)
getBroker().getObjectByIdentity(partyGroupId);
setParameter("party", partyGroup);
}
else if (CParty.TYPE_PERSON.equals(party.getPartyTypeId()))
{
// Get the person
Identity personId =
getBroker().serviceIdentity().buildIdentity(CPerson.class, partyId);
// ClastCastException here
CPerson person = (CPerson) getBroker().getObjectByIdentity(personId);
setParameter("party", person);
}
else
{
setParameter("party", party);
}
-chris worley
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Re: ClassCastException with getObjectByIdentity()
I have found my problem. I was using the tag for in the
descriptor for party referencing PartyGroup and Person. After removing
the extent the correct instance is returned.
-chris worley
In the following code I get a ClassCastException when querying for the
PartyGroup or Person. PartyGroup and Person both extend Party.
Party.partyTypeId will determine if the party is a person or party
group. If the party is one of the two then I want to get the party
group or person object and return it. However, when the code queries
a second time for the person or party group a ClassCastException
occurs. getObjectByIdeneity(...) is retruning an instance of CParty,
even though when the Identity was build I passed CPartyGroup.class as
the param no CParty.class.
If I modify the code not to query for CParty first and just query for
CPartyGroup I will get an instance of CPartyGroup. But, for some
reason by building the CParty identity first the second attempt for
CPartyGroup still returns an instance of CParty. and I have no
idea why.
Can anyone shed some light on what is going on and why I continue to
get an instance of CParty and not CPartyGroup or CPerson.
// Find the party
Identity oid =
getBroker().serviceIdentity().buildIdentity(CParty.class, partyId);
CParty party = (CParty) getBroker().getObjectByIdentity(oid);
if (CParty.TYPE_PARTY_GROUP.equals(party.getPartyTypeId()))
{
// Get the Party Group
Identity partyGroupId =
getBroker().serviceIdentity().buildIdentity(CPartyGroup.class, partyId);
// ClastCastException here
CPartyGroup partyGroup = (CPartyGroup)
getBroker().getObjectByIdentity(partyGroupId);
setParameter("party", partyGroup);
}
else if (CParty.TYPE_PERSON.equals(party.getPartyTypeId()))
{
// Get the person
Identity personId =
getBroker().serviceIdentity().buildIdentity(CPerson.class, partyId);
// ClastCastException here
CPerson person = (CPerson) getBroker().getObjectByIdentity(personId);
setParameter("party", person);
}
else
{
setParameter("party", party);
}
-chris worley
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Re: ClassCastException with getObjectByIdentity()
Hi Chris,
Chris Worley wrote:
In the following code I get a ClassCastException when querying for the
PartyGroup or Person. PartyGroup and Person both extend Party.
Party.partyTypeId will determine if the party is a person or party
group. If the party is one of the two then I want to get the party
group or person object and return it. However, when the code queries a
second time for the person or party group a ClassCastException occurs.
getObjectByIdeneity(...) is retruning an instance of CParty, even though
when the Identity was build I passed CPartyGroup.class as the param no
CParty.class.
If I modify the code not to query for CParty first and just query for
CPartyGroup I will get an instance of CPartyGroup. But, for some reason
by building the CParty identity first the second attempt for CPartyGroup
still returns an instance of CParty. and I have no idea why.
Can anyone shed some light on what is going on and why I continue to get
an instance of CParty and not CPartyGroup or CPerson.
Which kind of inheritance do you use? In OJB <=1.0.3 there is a bug in
retrieve objects using "Mapping Classes on Multiple Joined Tables" (see
release notes, it's fixed in CVS OJB_1_0_RELEASE branch).
> CParty party = (CParty) getBroker().getObjectByIdentity(oid);
This call should return the correct object instance, no need to query
with the correct partyIdType again.
Could you post the metadata mapping for Party, Person, PartyGroup?
regards,
Armin
// Find the party
Identity oid = getBroker().serviceIdentity().buildIdentity(CParty.class,
partyId);
CParty party = (CParty) getBroker().getObjectByIdentity(oid);
if (CParty.TYPE_PARTY_GROUP.equals(party.getPartyTypeId()))
{
// Get the Party Group
Identity partyGroupId =
getBroker().serviceIdentity().buildIdentity(CPartyGroup.class, partyId);
// ClastCastException here
CPartyGroup partyGroup = (CPartyGroup)
getBroker().getObjectByIdentity(partyGroupId);
setParameter("party", partyGroup);
}
else if (CParty.TYPE_PERSON.equals(party.getPartyTypeId()))
{
// Get the person
Identity personId =
getBroker().serviceIdentity().buildIdentity(CPerson.class, partyId);
// ClastCastException here
CPerson person = (CPerson) getBroker().getObjectByIdentity(personId);
setParameter("party", person);
}
else
{
setParameter("party", party);
}
-chris worley
-
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
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To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
ClassCastException with getObjectByIdentity()
In the following code I get a ClassCastException when querying for the
PartyGroup or Person. PartyGroup and Person both extend Party.
Party.partyTypeId will determine if the party is a person or party
group. If the party is one of the two then I want to get the party
group or person object and return it. However, when the code queries a
second time for the person or party group a ClassCastException occurs.
getObjectByIdeneity(...) is retruning an instance of CParty, even though
when the Identity was build I passed CPartyGroup.class as the param no
CParty.class.
If I modify the code not to query for CParty first and just query for
CPartyGroup I will get an instance of CPartyGroup. But, for some reason
by building the CParty identity first the second attempt for CPartyGroup
still returns an instance of CParty. and I have no idea why.
Can anyone shed some light on what is going on and why I continue to get
an instance of CParty and not CPartyGroup or CPerson.
// Find the party
Identity oid = getBroker().serviceIdentity().buildIdentity(CParty.class,
partyId);
CParty party = (CParty) getBroker().getObjectByIdentity(oid);
if (CParty.TYPE_PARTY_GROUP.equals(party.getPartyTypeId()))
{
// Get the Party Group
Identity partyGroupId =
getBroker().serviceIdentity().buildIdentity(CPartyGroup.class, partyId);
// ClastCastException here
CPartyGroup partyGroup = (CPartyGroup)
getBroker().getObjectByIdentity(partyGroupId);
setParameter("party", partyGroup);
}
else if (CParty.TYPE_PERSON.equals(party.getPartyTypeId()))
{
// Get the person
Identity personId =
getBroker().serviceIdentity().buildIdentity(CPerson.class, partyId);
// ClastCastException here
CPerson person = (CPerson) getBroker().getObjectByIdentity(personId);
setParameter("party", person);
}
else
{
setParameter("party", party);
}
-chris worley
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