使用外键字段持久化实体时出错
我试着坚持数据库这个实体：
@Entity @Table(name="pessoa_juridica") public class PessoaJuridica { @Id @Column(name = "id") @GeneratedValue(strategy=GenerationType.IDENTITY) private Integer id; @Column(name="cnpj") @Order(value=1) private String cnpj; @Column(name="razao_social") @Order(value=2) private String razaoSocial; @OneToOne( fetch = FetchType.EAGER, cascade = {CascadeType.ALL} ) @Order(value=3) @JoinColumn(name="contato") private Contato contato; } 但是当我用表单打开视图时，我收到此错误：
org.springframework.beans.NullValueInNestedPathException: Invalid property 'pessoaJuridica.contato' of bean class [com.spring.loja.model.cliente.persistence.model.Cliente]: Could not instantiate property type [java.lang.Integer] to auto-grow nested property path: java.lang.InstantiationException: java.lang.Integerorg.springframework.beans.BeanWrapperImpl.newValue(BeanWrapperImpl.java:651) org.springframework.beans.BeanWrapperImpl.createDefaultPropertyValue(BeanWrapperImpl.java:620) org.springframework.beans.BeanWrapperImpl.setDefaultValue(BeanWrapperImpl.java:609) org.springframework.beans.BeanWrapperImpl.getNestedBeanWrapper(BeanWrapperImpl.java:574) org.springframework.beans.BeanWrapperImpl.getBeanWrapperForPropertyPath(BeanWrapperImpl.java:548) org.springframework.beans.BeanWrapperImpl.getBeanWrapperForPropertyPath(BeanWrapperImpl.java:549) org.springframework.beans.BeanWrapperImpl.getPropertyValue(BeanWrapperImpl.java:714) org.springframework.validation.AbstractPropertyBindingResult.getActualFieldValue(AbstractPropertyBindingResult.java:99) org.springframework.validation.AbstractBindingResult.getFieldValue(AbstractBindingResult.java:229) org.springframework.web.servlet.support.BindStatus.(BindStatus.java:120) org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getBindStatus(AbstractDataBoundFormElementTag.java:168) org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getPropertyPath(AbstractDataBoundFormElementTag.java:188)org.springframework.web.servlet.tags.form.LabelTag.autogenerateFor(LabelTag.java:130)org.springframework.web.servlet.tags.form.LabelTag.resolveFor(LabelTag.java:120)org.springframework.web.servlet.tags.form.LabelTag.writeTagContent(LabelTag.java:90)org.springframework.web.servlet.tags.form.AbstractFormTag.doStartTagInternal(AbstractFormTag.java:84)org.springframework.web.servlet.tags.RequestContextAwareTag.doStartTag(RequestContextAwareTag.java:80)org.apache.jsp.WEB_002dINF.jsp.common.fields_jsp._jspx_meth_form_005flabel_005f13(fields_jsp.java:2969)org.apache.jsp.WEB_002dINF.jsp.common.fields_jsp._jspx_meth_c_005fwhen_005f17(fields_jsp.java:2836)org.apache.jsp.WEB_002dINF.jsp.common.fields_jsp._jspx_meth_c_005fchoose_005f3(fields_jsp.java:2583)org.apache.jsp.WEB_002dINF.jsp.common.fields_jsp._jspx_meth_c_005fforEach_005f4(fields_jsp.java:2539)org.apache.jsp.WEB_002dINF.jsp.common.fields_jsp._jspx_meth_c_005fwhen_005f14(fields_jsp.java:2444)org.apache.jsp.WEB_002dINF.jsp.common.fields_jsp._jspx_meth_c_005fchoose_005f0(fields_jsp.java:242)org.apache.jsp.WEB_002dINF.jsp.common.fields_jsp._jspx_meth_c_005fforEach_005f0(fields_jsp.java:150)org.apache.jsp.WEB_002dINF.jsp.common.fields_jsp._jspService(fields_jsp.java:115)org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)javax.servlet.http.HttpServlet.service(HttpServlet.java:728)org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)javax.servlet.http.HttpServlet.service(HttpServlet.java:728)org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:954)org.apache.jsp.WEB_002dINF.jsp.private_.cadastrar_jsp._jspx_meth_form_005fform_005f0(cadastrar_jsp.java:166)org.apache.jsp.WEB_002dINF.jsp.private_.cadastrar_jsp._jspService(cadastrar_jsp.java:88)org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)javax.servlet.http.HttpServlet.service(HttpServlet.java:728)org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)javax.servlet.http.HttpServlet.service(HttpServlet.java:728)org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:209)org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:267)org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1217)org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1005)org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:952)org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:870)org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961)org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:852)javax.servlet.http.HttpServlet.service(HttpServlet.java:621)org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837)javax.servlet.http.HttpServlet.service(HttpServlet.java:728)org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:118)org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:84)org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113)org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:103)org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:113)org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:154)org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:45)org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:199)org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:199)org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:110)org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:57)org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108)org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87)org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:50)org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108)org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:192)org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:160)org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:344)org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:261)
Contato的setter / getter方法是：
public Integer getContato() { return contato.getId(); } public void setContato(Integer id) { this.contato = new Contato(id); }
Contato这个类是这样的：
@Entity @Table(name="contato") public class Contato { @Id @Column(name = "id") @GeneratedValue(strategy=GenerationType.IDENTITY) private Integer id; @Column(name="nome", unique=true) @Order(value=1) private String nome; @Column(name="email") @Order(value=2) private String email; @Column(name="telefone") @Order(value=3) private String telefone; public Contato() { this.id = null; this.nome = null; this.email = null; this.telefone = null; } public Contato(Integer id) { this.id = id; } }
如果我尝试使用setter / getter方法：
public Contato getContato() { return contato; } public void setContato(Contato contato) { this.contato = contato; }
视图已打开，但是当我尝试提交表单时，我收到错误：
org.hibernate.PersistentObjectException: detached entity passed to persist: com.spring.loja.model.contato.persistence.model.Contatoorg.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:139)org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:801)org.hibernate.internal.SessionImpl.persist(SessionImpl.java:794)org.hibernate.engine.spi.CascadingActions$7.cascade(CascadingActions.java:314)org.hibernate.engine.internal.Cascade.cascadeToOne(Cascade.java:350)org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:293)org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:161)org.hibernate.engine.internal.Cascade.cascade(Cascade.java:118)org.hibernate.event.internal.AbstractSaveEventListener.cascadeBeforeSave(AbstractSaveEventListener.java:432)org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:265)org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:194)org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:125)org.hibernate.event.internal.DefaultPersistEventListener.entityIsTransient(DefaultPersistEventListener.java:206)org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:149)org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:801)org.hibernate.internal.SessionImpl.persist(SessionImpl.java:794)org.hibernate.engine.spi.CascadingActions$7.cascade(CascadingActions.java:314)org.hibernate.engine.internal.Cascade.cascadeToOne(Cascade.java:350)org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:293)org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:161)org.hibernate.engine.internal.Cascade.cascade(Cascade.java:118)org.hibernate.event.internal.AbstractSaveEventListener.cascadeBeforeSave(AbstractSaveEventListener.java:432)org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:265)org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:194)org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:125)org.hibernate.event.internal.DefaultPersistEventListener.entityIsTransient(DefaultPersistEventListener.java:206)org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:149)org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:75)org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:811)org.hibernate.internal.SessionImpl.persist(SessionImpl.java:784)org.hibernate.internal.SessionImpl.persist(SessionImpl.java:789)com.spring.loja.config.generic.persistence.Dao.persist(Dao.java:32)com.spring.loja.config.generic.persistence.Dao$$FastClassBySpringCGLIB$$ddbbe880.invoke()org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:711)org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:136)org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:98)org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:262)org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:95)org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:644)com.spring.loja.model.cliente.persistence.ClienteHome$$EnhancerBySpringCGLIB$$83cbd101.persist()com.spring.loja.config.generic.service.service.cadastra(service.java:45)com.spring.loja.config.generic.service.service$$FastClassBySpringCGLIB$$c92a3159.invoke()org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:711)org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)org.springframework.security.access.intercept.aopalliance.MethodSecurityInterceptor.invoke(MethodSecurityInterceptor.java:64)org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:98)org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:262)org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:95)org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:644)com.spring.loja.model.cliente.service.ClienteService$$EnhancerBySpringCGLIB$$71ccd54c.cadastra()com.spring.loja.config.generic.controller.controller.cadastra(controller.java:42)com.spring.loja.config.generic.controller.controller$$FastClassBySpringCGLIB$$c8cc444b.invoke()org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:640)com.spring.loja.model.cliente.controller.ClienteController$$EnhancerBySpringCGLIB$$ffe13d4e_2.cadastra()sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)java.lang.reflect.Method.invoke(Method.java:606)org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:215)org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:749)org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:689)org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83)org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:938)org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:870)org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961)org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:863)javax.servlet.http.HttpServlet.service(HttpServlet.java:647)org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837)javax.servlet.http.HttpServlet.service(HttpServlet.java:728)org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:118)org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:84)org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113)org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:103)org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:113)org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:154)org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:45)org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:199)org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:199)org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:110)org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:57)org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108)org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87)org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:50)org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108)org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:192)org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:160)org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:344)org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:261)
谁知道坚持实体的正确方法？
UPDATE
字段contato映射到视图上，如下所示：
更新2
在数据库中，这是表的创建方式：
CREATE TABLE pessoa_juridica ( id serial NOT NULL, cnpj character varying(255), razao_social character varying(255), contato integer, CONSTRAINT pessoa_juridica_pkey PRIMARY KEY (id), CONSTRAINT fk_eaa4oxajsuofatiyag213dio9 FOREIGN KEY (contato) REFERENCES contato (id) MATCH SIMPLE ON UPDATE NO ACTION ON DELETE NO ACTION ) WITH ( OIDS=FALSE ); ALTER TABLE pessoa_juridica OWNER TO klebermo; CREATE TABLE contato ( id serial NOT NULL, email character varying(255), nome character varying(255), telefone character varying(255), CONSTRAINT contato_pkey PRIMARY KEY (id), CONSTRAINT uk_rrtn7wgfxo0jfwkhby23f72cn UNIQUE (nome) ) WITH ( OIDS=FALSE ); ALTER TABLE contato OWNER TO klebermo;
我记得，连接列名称不是您要加入的对象的名称，而是您要加入的对象上的列的名称。
你告诉JPA级联所有！ 并传递了分离的对象来保存，这是一个问题。
据Hibernate说 。
CascadeType.PERSIST：将persist（create）操作级联到关联实体，调用persist（）或者管理实体
你说@OneToOne( fetch = FetchType.EAGER, cascade = {CascadeType.ALL} )意味着它将应用所有传递持久性。
因此删除cascade = {CascadeType.ALL}将解决问题。
@OneToOne( fetch = FetchType.EAGER) @Order(value=3) @JoinColumn(name="contato") private Contato contato;