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Re: [eclipselink-users] EntityManager.find returning instance of wrong type
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Currently you've got
@Inheritance(strategy=InheritanceType.SINGLE_TABLE) on the subclasses,
try putting them ONLY on the base class.
On Sun, Mar 8, 2009 at 6:50 AM, jsw <marvin.438@xxxxxxxxx> wrote:
>
> If I've understood correctly, when the DiscriminatorColumn annotation is
> missing JPA defaults to DTYPE (with values corresponding to the entity
> name). Just to be sure I tried adding the DiscriminatorColumn annotation to
> the Base class and DiscriminatorValue annotations to the subclasses (I had
> already moved the Inheritance from the deriving clases to the Base class)
> but it made no difference: the problem persists.
>
>
>
> Zarar Siddiqi wrote:
>>
>> How would JPA know what row coincides with what subclass? To tell it
>> that you'll need to use the @DiscriminatorColumn on the parent class
>> and supply a unique value for each subclass using the
>> @DiscriminatorValue for the subclasses.
>>
>> Also, the @Inheritance(strategy=InheritanceType.SINGLE_TABLE)
>> annotation goes on the parent class.
>>
>> Zarar
>>
>>
>> On Fri, Mar 6, 2009 at 8:52 AM, jsw <marvin.438@xxxxxxxxx> wrote:
>>>
>>> In my REST service:
>>>
>>> public void doTest() {
>>> long id = 12; // valid id of Bar entity
>>>
>>> List<Base> bases = this.facade.getDAO().findAllBase();
>>>
>>> Base base = null;
>>> try {
>>> if ((base = this.facade.getWorkOrderDAO().findFooById(id)) !=
>>> null) { // this row will throw an exception
>>> log.debug("Found Foo");
>>> } else if ((base =
>>> this.facade.getWorkOrderDAO().findBarById(id)) != null) {
>>> log.debug("Found Bar");
>>> }
>>>
>>> } catch (Exception ex) {
>>> ex.printStackTrace();
>>> }
>>> }
>>>
>>> And in the DAO class:
>>>
>>> @Transactional(readOnly = true, propagation=Propagation.SUPPORTS)
>>> public List<Base> findAllBase() {
>>> return em.createQuery("select b from Base b").getResultList();
>>> }
>>>
>>> @Transactional(readOnly = true, propagation=Propagation.SUPPORTS)
>>> public Foo findFooById(long id) {
>>> return em.find(Foo.class, id);
>>> }
>>>
>>> @Transactional(readOnly = true, propagation=Propagation.SUPPORTS)
>>> public Bar findBarById(long id) {
>>> return em.find(Bar.class, id);
>>> }
>>>
>>> java.lang.ClassCastException: com.acme.planning.dataaccess.model.Bar
>>> cannot
>>> be cast to com.acme.planning.dataaccess.model.Foo
>>> at com.acme.planning.dataaccess.DAO.findFooById(DAO.java:348)
>>> at
>>> com.acme.planning.dataaccess.DAO$$FastClassByCGLIB$$80c0e135.invoke(<generated>)
>>> at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:191)
>>> at
>>> org.springframework.aop.framework.Cglib2AopProxy$CglibMethodInvocation.invokeJoinpoint(Cglib2AopProxy.java:700)
>>> at
>>> org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
>>> at
>>> org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)
>>> at
>>> org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
>>> at
>>> org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:635)
>>> at
>>> com.acme.planning.dataaccess.DAO$$EnhancerByCGLIB$$93a24725.findFooById(<generated>)
>>> at
>>> com.acme.planning.interaction.rest.MobilogService.test(MobilogService.java:829)
>>> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>>> at
>>> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>>> at
>>> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>>> at java.lang.reflect.Method.invoke(Method.java:597)
>>> at
>>> com.sun.jersey.server.impl.model.method.dispatch.EntityParamDispatchProvider$ResponseOutInvoker._dispatch(EntityParamDispatchProvider.java:157)
>>> at
>>> com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:67)
>>> at
>>> com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:154)
>>> at
>>> com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:111)
>>> at
>>> com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:71)
>>> at
>>> com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:111)
>>> at
>>> com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:63)
>>> at
>>> com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:543)
>>> at
>>> com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:502)
>>> at
>>> com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:493)
>>> at
>>> com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:308)
>>> at
>>> com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:314)
>>> at
>>> com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:239)
>>> at
>>> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
>>> at
>>> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
>>> at
>>> com.acme.common.filter.CacheControlFilter.doFilter(CacheControlFilter.java:72)
>>> at
>>> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
>>> at
>>> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
>>> at
>>> org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:378)
>>> at
>>> org.springframework.security.intercept.web.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:109)
>>> at
>>> org.springframework.security.intercept.web.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:83)
>>> at
>>> org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)
>>> at
>>> org.springframework.security.ui.SessionFixationProtectionFilter.doFilterHttp(SessionFixationProtectionFilter.java:67)
>>> at
>>> org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)
>>> at
>>> org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)
>>> at
>>> org.springframework.security.ui.ExceptionTranslationFilter.doFilterHttp(ExceptionTranslationFilter.java:101)
>>> at
>>> org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)
>>> at
>>> org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)
>>> at
>>> org.springframework.security.providers.anonymous.AnonymousProcessingFilter.doFilterHttp(AnonymousProcessingFilter.java:105)
>>> at
>>> org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)
>>> at
>>> org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)
>>> at
>>> org.springframework.security.wrapper.SecurityContextHolderAwareRequestFilter.doFilterHttp(SecurityContextHolderAwareRequestFilter.java:91)
>>> at
>>> org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)
>>> at
>>> org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)
>>> at
>>> org.springframework.security.ui.basicauth.BasicProcessingFilter.doFilterHttp(BasicProcessingFilter.java:174)
>>> at
>>> org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)
>>> at
>>> org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)
>>> at
>>> org.springframework.security.ui.AbstractProcessingFilter.doFilterHttp(AbstractProcessingFilter.java:277)
>>> at
>>> org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)
>>> at
>>> org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)
>>> at
>>> org.springframework.security.ui.logout.LogoutFilter.doFilterHttp(LogoutFilter.java:89)
>>> at
>>> org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)
>>> at
>>> org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)
>>> at
>>> org.springframework.security.context.HttpSessionContextIntegrationFilter.doFilterHttp(HttpSessionContextIntegrationFilter.java:235)
>>> at
>>> org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)
>>> at
>>> org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)
>>> at
>>> org.springframework.security.util.FilterChainProxy.doFilter(FilterChainProxy.java:175)
>>> at
>>> org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:236)
>>> at
>>> org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167)
>>> at
>>> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
>>> at
>>> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
>>> at
>>> org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:96)
>>> at
>>> org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
>>> at
>>> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
>>> at
>>> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
>>> at
>>> org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
>>> at
>>> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
>>> at
>>> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
>>> at
>>> org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
>>> at
>>> org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
>>> at
>>> org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:179)
>>> at
>>> org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
>>> at
>>> org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
>>> at
>>> org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
>>> at
>>> org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)
>>> at
>>> org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
>>> at
>>> org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262)
>>> at
>>> org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
>>> at
>>> org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
>>> at
>>> org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446)
>>> at java.lang.Thread.run(Thread.java:619)
>>>
>>>
>>> tch wrote:
>>>>
>>>> Doesn't sound right, can you post the whole stack trace?
>>>>
>>>> ./tch
>>>>
>>>>
>>>>
>>>> On Fri, Mar 6, 2009 at 7:56 AM, jsw <marvin.438@xxxxxxxxx> wrote:
>>>>>
>>>>> OK, thank you, it seems I had misunderstood how to use the @Inheritance
>>>>> annotation. However, in this case it does not seem to make a difference
>>>>> since SINGLE_TABLE is the default inheritance type.
>>>>>
>>>>> Unfortunately, moving the @Inherintance annotation to the base class
>>>>> did
>>>>> not
>>>>> solve my problem. EntityManager.find keeps trying to return an instance
>>>>> of
>>>>> the wrong entity.
>>>>>
>>>>> Maybe something more I've misunderstood?
>>>>>
>>>>>
>>>>>
>>>>> tch wrote:
>>>>>>
>>>>>> I've never used the @Inheritance annotation, but I believe it goes on
>>>>>> the base class, not the extending entity.
>>>>>>
>>>>>> See:
>>>>>> http://www.oracle.com/technology/products/ias/toplink/jpa/howto/use-inheritance.html
>>>>>>
>>>>>>
>>>>>>
>>>>>> On Fri, Mar 6, 2009 at 3:00 AM, jsw <marvin.438@xxxxxxxxx> wrote:
>>>>>>>
>>>>>>> Environment: JBoss, Jersey, Spring, EclipseLink JPA, PostgreSQL
>>>>>>>
>>>>>>> @Entity
>>>>>>> public abstract class Base {
>>>>>>> @Id
>>>>>>> @GeneratedValue(strategy = GenerationType.TABLE)
>>>>>>> private Long id;
>>>>>>>
>>>>>>> @Version
>>>>>>> private long version;
>>>>>>>
>>>>>>> ...
>>>>>>> }
>>>>>>>
>>>>>>> @Entity
>>>>>>> @Inheritance(strategy=InheritanceType.SINGLE_TABLE)
>>>>>>> public class Foo extends Base { ... }
>>>>>>>
>>>>>>> @Entity
>>>>>>> @Inheritance(strategy=InheritanceType.SINGLE_TABLE)
>>>>>>> public class Bar extends Base { ... }
>>>>>>>
>>>>>>> Then when I do:
>>>>>>>
>>>>>>> Long aId = 76576; // a valid id for an entity of type Bar
>>>>>>> Foo foo = em.find(Foo.class, aId); // em is EntityManager
>>>>>>>
>>>>>>> an exception is thrown (the root cause seems to be
>>>>>>> ClassCastException)
>>>>>>> because the EntityManager tries to return an object of type Bar.
>>>>>>>
>>>>>>> What am I doing wrong?
>>>>>>> --
>>>>>>> View this message in context:
>>>>>>> http://www.nabble.com/EntityManager.find-returning-instance-of-wrong-type-tp22367490p22367490.html
>>>>>>> Sent from the EclipseLink - Users mailing list archive at Nabble.com.
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> eclipselink-users mailing list
>>>>>>> eclipselink-users@xxxxxxxxxxx
>>>>>>> https://dev.eclipse.org/mailman/listinfo/eclipselink-users
>>>>>>>
>>>>>> _______________________________________________
>>>>>> eclipselink-users mailing list
>>>>>> eclipselink-users@xxxxxxxxxxx
>>>>>> https://dev.eclipse.org/mailman/listinfo/eclipselink-users
>>>>>>
>>>>>>
>>>>>
>>>>> --
>>>>> View this message in context:
>>>>> http://www.nabble.com/EntityManager.find-returning-instance-of-wrong-type-tp22367490p22371962.html
>>>>> Sent from the EclipseLink - Users mailing list archive at Nabble.com.
>>>>>
>>>>> _______________________________________________
>>>>> eclipselink-users mailing list
>>>>> eclipselink-users@xxxxxxxxxxx
>>>>> https://dev.eclipse.org/mailman/listinfo/eclipselink-users
>>>>>
>>>> _______________________________________________
>>>> eclipselink-users mailing list
>>>> eclipselink-users@xxxxxxxxxxx
>>>> https://dev.eclipse.org/mailman/listinfo/eclipselink-users
>>>>
>>>>
>>>
>>> --
>>> View this message in context:
>>> http://www.nabble.com/EntityManager.find-returning-instance-of-wrong-type-tp22367490p22372894.html
>>> Sent from the EclipseLink - Users mailing list archive at Nabble.com.
>>>
>>> _______________________________________________
>>> eclipselink-users mailing list
>>> eclipselink-users@xxxxxxxxxxx
>>> https://dev.eclipse.org/mailman/listinfo/eclipselink-users
>>>
>> _______________________________________________
>> eclipselink-users mailing list
>> eclipselink-users@xxxxxxxxxxx
>> https://dev.eclipse.org/mailman/listinfo/eclipselink-users
>>
>>
>
> --
> View this message in context: http://www.nabble.com/EntityManager.find-returning-instance-of-wrong-type-tp22367490p22396645.html
> Sent from the EclipseLink - Users mailing list archive at Nabble.com.
>
> _______________________________________________
> eclipselink-users mailing list
> eclipselink-users@xxxxxxxxxxx
> https://dev.eclipse.org/mailman/listinfo/eclipselink-users
>
