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Re: [eclipselink-users] EntityManager.find returning instance of wrong type
|
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.
