データベースからデータを削除しようとすると:
@Override
public void delete(PatientCard patientCard) {
PatientCard toRemoved = em.merge(patientCard);
em.remove(toRemoved);
}
エラーが発生します：
警告: EJB5184: EJB PatientCardDao、メソッドの呼び出し中にシステム例外が発生しました: public void pl.ePrzychodnia.dao.daoClass.PatientCardDao.delete(pl.ePrzychodnia.model.PatientCard) 警告: com.sun で javax.ejb.EJBException com.sun.ejb.containers.BaseContainer.completeNewTx(BaseContainer.java:5113) の .ejb.containers.BaseContainer.processSystemException(BaseContainer.java:5215) com.sun.ejb.containers.BaseContainer.postInvokeTx(BaseContainer.java) :4901) com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:2045) com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:1994) com.sun.ejb.containers. com.sun.ejb.containers の EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:222)。EJBLocalObjectInvocationHandlerDelegate.invoke(EJBLocalObjectInvocationHandlerDelegate.java:89) com.sun.proxy.$Proxy275.delete で (不明なソース) pl.ePrzychodnia.mb.PatientCardMB.delete(PatientCardMB.java:149) で sun.reflect.NativeMethodAccessorImpl.invoke0 (ネイティブ メソッド) (sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)) で sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) で java.lang.reflect.Method.invoke(Method.java:601) ) javax.el.BeanELResolver.invokeMethod(BeanELResolver.java:779) で javax.el.BeanELResolver.invoke(BeanELResolver.java:528) で javax.el.CompositeELResolver.invoke(CompositeELResolver.java:257) で com.sun .el.parser.AstValue.invoke(AstValue.java:248) com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:302) で com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105) で javax.faces.component.MethodBindingMethodExpressionAdapter.invoke (MethodBindingMethodExpressionAdapter.java:88) com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102) で javax.faces.component.UICommand.broadcast(UICommand.java:315) で javax.faces.component で。 UIData.broadcast(UIData.java:1093)、javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:794)、javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1259)、com.sun.faces com.sun.faces の .lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)。lifecycle.Phase.doPhase(Phase.java:101) com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118) で javax.faces.webapp.FacesServlet.service(FacesServlet.java:593) で org .apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1550) org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:343) org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain) .java:217) で pl.ePrzychodnia.filter.FilterLogin.doFilter(FilterLogin.java:49) で org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256) で org.apache.catalina.core. org.apache.catalina.core.StandardWrapperValve の ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217)。org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175) の invoke(StandardWrapperValve.java:279) org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655) の org.apache .catalina.core.StandardPipeline.invoke(StandardPipeline.java:595) org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161) org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java) :331) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231) で com.sun.enterprise.v3.services.impl.ContainerMapper$AdapterCallable.call(ContainerMapper.java:317) で com. com.sun.grizzly.http.ProcessorTask の sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195)。com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:757) の invokeAdapter(ProcessorTask.java:860) com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1056) com.sun の.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:229) で com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137) で com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104) でcom.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90) com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79) com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java: 54) com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59) com.sun.grizzly.ContextTask.run(ContextTask.java:71) で com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532) で com.sun.grizzly.util.AbstractThreadPool java.lang.Thread.run(Thread.java:722) の $Worker.run(AbstractThreadPool.java:513) .hibernate.ejb.event.EJB3DeleteEventListener.performDetachedEntityDeletionCheck(EJB3DeleteEventListener.java:45) org.hibernate.event.def.DefaultDeleteEventListener.onDelete(DefaultDeleteEventListener.java:86) org.hibernate.event.def.DefaultDeleteEventListener.onDelete(DefaultDeleteEventListener) .java:52) org.hibernate.impl.SessionImpl.fireDelete(SessionImpl.java:766) org.hibernate.impl.SessionImpl.delete(SessionImpl.java:744) で org.hibernate.ejb.AbstractEntityManagerImpl.remove(AbstractEntityManagerImpl.java:253) で com.sun.enterprise.container.common.impl.EntityManagerWrapper .remove(EntityManagerWrapper.java:303) で pl.ePrzychodnia.dao.daoClass.PatientCardDao.delete(PatientCardDao.java:48) で sun.reflect.NativeMethodAccessorImpl.invoke0(ネイティブ メソッド) で sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl) .java:57) で、sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) で、java.lang.reflect.Method.invoke(Method.java:601) で、org.glassfish.ejb.security.application.EJBSecurityManager で。 org.glassfish.ejb.security の runMethod(EJBSecurityManager.java:1052)。application.EJBSecurityManager.invoke(EJBSecurityManager.java:1124) com.sun.ejb.containers.BaseContainer.invokeBeanMethod(BaseContainer.java:5388) com.sun.ejb.EjbInvocation.invokeBeanMethod(EjbInvocation.java:619) com .sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:800) at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:571) at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.doAround (SystemInterceptorProxy.java:162) com.sun.ejb.containers.interceptors.SystemInterceptorProxy.aroundInvoke(SystemInterceptorProxy.java:144) で sun.reflect.GeneratedMethodAccessor457.invoke(不明なソース) で sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl) .java:43) java.lang.reflect で。com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:861) の Method.invoke(Method.java:601) com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java: 800) com.sun.ejb.containers.interceptors.InterceptorManager.intercept(InterceptorManager.java:370) com.sun.ejb.containers.BaseContainer.__intercept(BaseContainer.java:5360) com.sun.ejb.containers .BaseContainer.intercept(BaseContainer.java:5348) at com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:214) ... 52com.sun.ejb.containers.interceptors.InterceptorManager.intercept(InterceptorManager.java:370) の AroundInvokeChainImpl.invokeNext(InterceptorManager.java:800) com.sun.ejb.containers.BaseContainer.__intercept(BaseContainer.java:5360) のcom.sun.ejb.containers.BaseContainer.intercept(BaseContainer.java:5348) で com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:214) で ... 52com.sun.ejb.containers.interceptors.InterceptorManager.intercept(InterceptorManager.java:370) の AroundInvokeChainImpl.invokeNext(InterceptorManager.java:800) com.sun.ejb.containers.BaseContainer.__intercept(BaseContainer.java:5360) のcom.sun.ejb.containers.BaseContainer.intercept(BaseContainer.java:5348) で com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:214) で ... 52EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:214) ... 52EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:214) ... 52
しかし、次のように変更すると:
@Override
public void delete(PatientCard patientCard) {
PatientCard toRemoved = em.merge(em.find(PatientCard.class, patientCard.getId()));
em.remove(toRemoved);
}
データが削除されます。なんで？
エンティティが管理されているかどうかを確認したかった:
toRemoved = em.merge (patientCard)
boolean a = em.contains (toRemoved);
System.out.println (a);
そして、私は本当だと思います。
なぜ？
em.remove(toRemoved);
場合によってはエラーが発生しますか？