Re: [Xdoclet-user] n:m mapping

[Clarance H. <cla...@me...>]

Just had another look at this problem and I think the problem is not in=20
your mapping but in XDoclet's handling of m:n relationships in value=20
objects.  When you try to get the Organisation value object you get all=20
associated periods and when you get all periods, xdoclet generated code=20
tries to get all the Organisations.  The exception that you are seeing=20
is a result of this circular dependency.

You could fix it by excluding one of the collections from your value=20
object or changing the XDoclet generated implementation code to check=20
for this circular dependency.

Hope this helps
Cheers
C.

Vang Nguyen wrote:

>Hi,
>
>Does any one have a working mapping of a bidirectional n:m relationship =
that they could share?  I've been trying with various settings with no lu=
ck.  My current xdoclet declarations for the relationship between Organsi=
ation and Period entities are below, but I'm getting the exception listed=
 below the code.=20
>
>
>	/**
>	 * @ejb.relation
>	 *  name=3D"Organisation-Period"
>	 *  role-name=3D"periods-have-organisations"
>	 * @weblogic.column-map
>	 *  key-column=3D"C_ID"
>	 *  foreign-key-column=3D"C_PERIOD_ID"
>	 * @weblogic.relation
>	 * 	join-table-name=3D"MPRS_ORGANISATION_PERIOD_JOIN"
>	 * @ejb.interface-method
>	 *  view-type=3D"local"
>	 * @ejb.value-object
>    	 *  aggregate=3D"au.gov.qld.des.mprs.dto.OrganisationTransferObject=
"
>    	 *  aggregate-name=3D"Organisation"
>     	*  members=3D"au.gov.qld.des.mprs.ejb.OrganisationLocal"
>     	*  members-name=3D"OrganisationLocal"
>    	 *  relation=3D"external"
>    	 *  type=3D"java.util.Collection"
>	 */
>	public abstract Collection getOrganisations();
>
>
>	/**
>	 * @ejb.relation
>	 *  name=3D"Organisation-Period"
>	 *  role-name=3D"organisations-have-periods"
>	 * @weblogic.column-map
>	 *  key-column=3D"C_ID"
>	 *  foreign-key-column=3D"C_ORGANISATION_ID"
>	 * @weblogic.relation
>	 * 	join-table-name=3D"MPRS_ORGANISATION_PERIOD_JOIN"
>	 * @ejb.interface-method
>	 *  view-type=3D"local"
>	 * @ejb.value-object
>     	*  aggregate=3D"au.gov.qld.des.mprs.dto.PeriodTransferObject"
>    	 *  aggregate-name=3D"Period"
>    	 *  members=3D"au.gov.qld.des.mprs.ejb.PeriodLocal"
>     	*  members-name=3D"PeriodLocal"
>    	 *  relation=3D"external"
>    	 *  type=3D"java.util.Collection"
>	 *
>	 */
>	public abstract java.util.Collection getPeriods();
>
>Exception occurred: au.gov.qld.des.mprs.exception.ServiceUnavailableExce=
ption: Exception occured getting Financial Years Caused By: au.gov.qld.de=
s.mprs.exception.ServiceUnavailableException: Error occurred Caused By: a=
u.gov.qld.des.mprs.exception.ServiceUnavailableException: Exception conve=
rting Caused By: javax.ejb.TransactionRolledbackLocalException: EJB Excep=
tion: ; nested exception is: javax.ejb.EJBException: nested exception is:=
 javax.ejb.TransactionRolledbackLocalException: EJB Exception: ; nested e=
xception is: javax.ejb.EJBException: nested exception is: javax.ejb.Trans=
actionRolledbackLocalException: [EJB:010180]Illegal Reentrant call to 'Pe=
riod(Application: mprs-ear-1.0, EJBComponent: mprs-ejb-1.0.jar)' with pri=
mary key: '1'.: weblogic.ejb20.InternalException: [EJB:010180]Illegal Ree=
ntrant call to 'Period(Application: mprs-ear-1.0, EJBComponent: mprs-ejb-=
1.0.jar)' with primary key: '1'. at weblogic.ejb20.manager.BaseEntityMana=
ger.checkForReentrant(Ljavax.ejb.EntityBean;Ljava.lang.Object;)V(BaseEnti=
tyManager.java:1468) at weblogic.ejb20.manager.DBManager.preInvoke(Lweblo=
gic.ejb20.internal.InvocationWrapper;)Ljavax.ejb.EnterpriseBean;(DBManage=
r.java:251) at weblogic.ejb20.internal.BaseEJBLocalObject.preInvoke(Lwebl=
ogic.ejb20.internal.InvocationWrapper;)Lweblogic.ejb20.internal.Invocatio=
nWrapper;(BaseEJBLocalObject.java:228) at weblogic.ejb20.internal.EntityE=
JBLocalObject.preInvoke(Lweblogic.ejb20.internal.MethodDescriptor;Lweblog=
ic.security.service.ContextHandler;)Lweblogic.ejb20.internal.InvocationWr=
apper;(EntityEJBLocalObject.java:72) at au.gov.qld.des.mprs.ejb.Period_a3=
1n8k_ELOImpl.getPeriodTransferObject()Lau.gov.qld.des.mprs.dto.PeriodTran=
sferObject;(Period_a31n8k_ELOImpl.java:514) at au.gov.qld.des.mprs.ejb.Or=
ganisationCMP.getOrganisationTransferObject()Lau.gov.qld.des.mprs.dto.Org=
anisationTransferObject;(OrganisationCMP.java:102) at au.gov.qld.des.mprs=
=2Eejb.Organisation_smb3qq_ELOImpl.getOrganisationTransferObject()Lau.gov=
=2Eqld.des.mprs.dto.OrganisationTransferObject;(Organisation_smb3qq_ELOIm=
pl.java:585) at au.gov.qld.des.mprs.ejb.PeriodCMP.getPeriodTransferObject=
()Lau.gov.qld.des.mprs.dto.PeriodTransferObject;(PeriodCMP.java:106) at a=
u.gov.qld.des.mprs.ejb.Period_a31n8k_ELOImpl.getPeriodTransferObject()Lau=
=2Egov.qld.des.mprs.dto.PeriodTransferObject;(Period_a31n8k_ELOImpl.java:=
531) at au.gov.qld.des.mprs.ejb.MPRSFacadeBean.convertPeriodLocalsToDTOs(=
Ljava.util.Collection;)Ljava.util.Collection;(MPRSFacadeBean.java:281) at=
 au.gov.qld.des.mprs.ejb.MPRSFacadeBean.findFinancialYears()Ljava.util.Co=
llection;(MPRSFacadeBean.java:222) at au.gov.qld.des.mprs.ejb.MPRSFacade_=
vhf35m_EOImpl.findFinancialYears()Ljava.util.Collection;(MPRSFacade_vhf35=
m_EOImpl.java:154) at au.gov.qld.des.mprs.ejb.MPRSFacade_vhf35m_EOImpl_CB=
V.findFinancialYears()Ljava.util.Collection;(Unknown Source) at au.gov.ql=
d.des.mprs.business.MPRSBusinessDelegate.findFinancialYears()Ljava.util.C=
ollection;(MPRSBusinessDelegate.java:83) at au.gov.qld.des.mprs.Financial=
YearAction.view(Lorg.apache.struts.action.ActionMapping;Lorg.apache.strut=
s.action.ActionForm;Ljavax.servlet.http.HttpServletRequest;Ljavax.servlet=
=2Ehttp.HttpServletResponse;)Lorg.apache.struts.action.ActionForward;(Fin=
ancialYearAction.java:43) at jrockit.reflect.NativeMethodInvoker.invoke0(=
Ljava.lang.Object;ILjava.lang.Object;[Ljava.lang.Object;)Ljava.lang.Objec=
t;(Unknown Source) at jrockit.reflect.NativeMethodInvoker.invoke(Ljava.la=
ng.Object;[Ljava.lang.Object;)Ljava.lang.Object;(Unknown Source) at jrock=
it.reflect.VirtualNativeMethodInvoker.invoke(Ljava.lang.Object;[Ljava.lan=
g.Object;)Ljava.lang.Object;(Unknown Source) at java.lang.reflect.Method.=
invoke(Ljava.lang.Object;[Ljava.lang.Object;I)Ljava.lang.Object;(Unknown =
Source) at org.apache.struts.actions.DispatchAction.dispatchMethod(Lorg.a=
pache.struts.action.ActionMapping;Lorg.apache.struts.action.ActionForm;Lj=
avax.servlet.http.HttpServletRequest;Ljavax.servlet.http.HttpServletRespo=
nse;Ljava.lang.String;)Lorg.apache.struts.action.ActionForward;(DispatchA=
ction.java:274) at org.apache.struts.actions.DispatchAction.execute(Lorg.=
apache.struts.action.ActionMapping;Lorg.apache.struts.action.ActionForm;L=
javax.servlet.http.HttpServletRequest;Ljavax.servlet.http.HttpServletResp=
onse;)Lorg.apache.struts.action.ActionForward;(DispatchAction.java:194) a=
t org.apache.struts.actions.MappingDispatchAction.execute(Lorg.apache.str=
uts.action.ActionMapping;Lorg.apache.struts.action.ActionForm;Ljavax.serv=
let.http.HttpServletRequest;Ljavax.servlet.http.HttpServletResponse;)Lorg=
=2Eapache.struts.action.ActionForward;(MappingDispatchAction.java:169) at=
 org.apache.struts.action.RequestProcessor.processActionPerform(Ljavax.se=
rvlet.http.HttpServletRequest;Ljavax.servlet.http.HttpServletResponse;Lor=
g.apache.struts.action.Action;Lorg.apache.struts.action.ActionForm;Lorg.a=
pache.struts.action.ActionMapping;)Lorg.apache.struts.action.ActionForwar=
d;(RequestProcessor.java:419) at org.apache.struts.action.RequestProcesso=
r.process(Ljavax.servlet.http.HttpServletRequest;Ljavax.servlet.http.Http=
ServletResponse;)V(RequestProcessor.java:224) at org.apache.struts.action=
=2EActionServlet.process(Ljavax.servlet.http.HttpServletRequest;Ljavax.se=
rvlet.http.HttpServletResponse;)V(ActionServlet.java:1194) at org.apache.=
struts.action.ActionServlet.doGet(Ljavax.servlet.http.HttpServletRequest;=
Ljavax.servlet.http.HttpServletResponse;)V(ActionServlet.java:414) at jav=
ax.servlet.http.HttpServlet.service(Ljavax.servlet.http.HttpServletReques=
t;Ljavax.servlet.http.HttpServletResponse;)V(HttpServlet.java:740) at jav=
ax.servlet.http.HttpServlet.service(Ljavax.servlet.ServletRequest;Ljavax.=
servlet.ServletResponse;)V(HttpServlet.java:853) at weblogic.servlet.inte=
rnal.ServletStubImpl$ServletInvocationAction.run()Ljava.lang.Object;(Serv=
letStubImpl.java:996) at weblogic.servlet.internal.ServletStubImpl.invoke=
Servlet(Ljavax.servlet.ServletRequest;Ljavax.servlet.ServletResponse;Lweb=
logic.servlet.internal.FilterChainImpl;)V(ServletStubImpl.java:419) at we=
blogic.servlet.internal.ServletStubImpl.invokeServlet(Ljavax.servlet.Serv=
letRequest;Ljavax.servlet.ServletResponse;)V(ServletStubImpl.java:315) at=
 weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.r=
un()Ljava.lang.Object;(WebAppServletContext.java:6452)
>
>
>
>Regards,
>
>Vang Nguyen
>
>Enterprise Application Programmer
>Department of Emergency Services
>(61-7) 3247 8586
>
>
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>
>and with the authority, states them to be the opinions of the Department=
 of Emergency Services, Queensland.
>
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