Can not Jackson序列化Hibernate实体

Question

我无法一起使用Hibernate和Jackson将JSON序列化为查询结果，并将它们传递给API调用。更具体地说，我遇到了单个实体EagleUsers的问题。除非在Adjuster实体中将它标记为@JsonIgnore，否则会导致在序列化时得到JsonMappingExceptions。我以前使用实体框架在C＃中尝试过这个项目，并且我必须完全排除EagleUsers以防止实体框架窒息它。

我的怀疑是它与Adjuster有两个外键给EagleUsers有关，但我似乎无法弄清楚，我已经用尽了我能想到的解决问题的方法。

的后盾数据库是SQL Server 2008的

这里是我的相关代码：

Adjuster.java

@Entity 
@Table(name = "Adjuster", schema = "dbo", catalog = "censored") 
public class Adjuster implements java.io.Serializable { 

    private int adjusterId; 
    private EagleUsers eagleUsersBySupervisorId; 
    private EagleUsers eagleUsersByUserId; 

    @Id 

    @Column(name = "AdjusterId", unique = true, nullable = false) 
    public int getAdjusterId() { 
     return this.adjusterId; 
    } 

    public void setAdjusterId(int adjusterId) { 
     this.adjusterId = adjusterId; 
    } 

    @ManyToOne(fetch = FetchType.LAZY) 
    @JoinColumn(name = "SupervisorId", nullable = false) 
    public EagleUsers getEagleUsersBySupervisorId() { 
     return this.eagleUsersBySupervisorId; 
    } 

    public void setEagleUsersBySupervisorId(EagleUsers eagleUsersBySupervisorId) { 
     this.eagleUsersBySupervisorId = eagleUsersBySupervisorId; 
    } 

    @ManyToOne(fetch = FetchType.LAZY) 
    @JoinColumn(name = "UserId", nullable = false) 
    public EagleUsers getEagleUsersByUserId() { 
     return this.eagleUsersByUserId; 
    } 

    public void setEagleUsersByUserId(EagleUsers eagleUsersByUserId) { 
     this.eagleUsersByUserId = eagleUsersByUserId; 
    } 
} 

EagleUsers.java

@Entity 
@Table(name = "EagleUsers", schema = "dbo", catalog = "censored") 
public class EagleUsers implements java.io.Serializable { 

    private String userId; 
    private AspnetUsers aspnetUsers; 
    private SubRole subRole; 
    private String firstName; 
    private String lastName; 

    @GenericGenerator(name = "generator", strategy = "foreign", parameters = @Parameter(name = "property", value = "aspnetUsers")) 
    @Id 
    @GeneratedValue(generator = "generator") 

    @Column(name = "UserId", unique = true, nullable = false, length = 36) 
    public String getUserId() { 
     return this.userId; 
    } 

    public void setUserId(String userId) { 
     this.userId = userId; 
    } 

    @OneToOne(fetch = FetchType.LAZY) 
    @PrimaryKeyJoinColumn 
    public AspnetUsers getAspnetUsers() { 
     return this.aspnetUsers; 
    } 

    public void setAspnetUsers(AspnetUsers aspnetUsers) { 
     this.aspnetUsers = aspnetUsers; 
    } 

    @Column(name = "FirstName", length = 30) 
    public String getFirstName() { 
     return this.firstName; 
    } 

    public void setFirstName(String firstName) { 
     this.firstName = firstName; 
    } 

    @Column(name = "LastName", length = 45) 
    public String getLastName() { 
     return this.lastName; 
    } 

    public void setLastName(String lastName) { 
     this.lastName = lastName; 
    } 
} 

HelloController.java

ObjectMapper mapper = new ObjectMapper(); 
Hibernate4Module module = new Hibernate4Module(); 
module.enable(Feature.SERIALIZE_IDENTIFIER_FOR_LAZY_NOT_LOADED_OBJECTS); 
module.enable(Feature.FORCE_LAZY_LOADING); 
mapper.registerModule(module); 
String result = mapper.writeValueAsString(adjusters); 
return result; 

例外我越来越：

2015-10-06 14:26:33.763 INFO 12596 --- [nio-8080-exec-1] o.h.e.internal.DefaultLoadEventListener : HHH000327: Error performing load command : org.hibernate.type.SerializationException: could not deserialize 
2015-10-06 14:26:33.764 INFO 12596 --- [nio-8080-exec-1] o.h.e.internal.DefaultLoadEventListener : HHH000327: Error performing load command : org.hibernate.type.SerializationException: could not deserialize 
2015-10-06 14:26:33.771 ERROR 12596 --- [nio-8080-exec-1] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception 

com.fasterxml.jackson.databind.JsonMappingException: could not deserialize (through reference chain: java.util.ArrayList[0]->radius.hibernate.dao.Adjuster["eagleUsersByUserId"]) 
    at com.fasterxml.jackson.databind.JsonMappingException.wrapWithPath(JsonMappingException.java:210) 
    at com.fasterxml.jackson.databind.JsonMappingException.wrapWithPath(JsonMappingException.java:177) 
    at com.fasterxml.jackson.databind.ser.std.StdSerializer.wrapAndThrow(StdSerializer.java:187) 
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:647) 
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase._serializeWithObjectId(BeanSerializerBase.java:558) 
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:145) 
    at com.fasterxml.jackson.databind.ser.std.ObjectArraySerializer.serializeContents(ObjectArraySerializer.java:228) 
    at com.fasterxml.jackson.databind.ser.std.ObjectArraySerializer.serializeContents(ObjectArraySerializer.java:25) 
    at com.fasterxml.jackson.databind.ser.std.ArraySerializerBase.serialize(ArraySerializerBase.java:57) 
    at com.fasterxml.jackson.databind.ser.impl.IndexedListSerializer.serializeContents(IndexedListSerializer.java:100) 
    at com.fasterxml.jackson.databind.ser.impl.IndexedListSerializer.serializeContents(IndexedListSerializer.java:21) 
    at com.fasterxml.jackson.databind.ser.std.AsArraySerializerBase.serialize(AsArraySerializerBase.java:183) 
    at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:128) 
    at com.fasterxml.jackson.databind.ObjectMapper._configAndWriteValue(ObjectMapper.java:2881) 
    at com.fasterxml.jackson.databind.ObjectMapper.writeValueAsString(ObjectMapper.java:2338) 
    at radius.hibernate.HelloController.index(HelloController.java:157) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) 
    at java.lang.reflect.Method.invoke(Unknown Source) 
    at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221) 
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137) 
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110) 
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:776) 
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:705) 
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85) 
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959) 
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893) 
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:967) 
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:858) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:622) 
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:843) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
    at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77) 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:85) 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219) 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106) 
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142) 
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) 
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88) 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518) 
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091) 
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:673) 
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1526) 
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1482) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) 
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) 
    at java.lang.Thread.run(Unknown Source) 
Caused by: org.hibernate.type.SerializationException: could not deserialize 
    at org.hibernate.internal.util.SerializationHelper.doDeserialize(SerializationHelper.java:262) 
    at org.hibernate.internal.util.SerializationHelper.deserialize(SerializationHelper.java:306) 
    at org.hibernate.type.descriptor.java.SerializableTypeDescriptor.fromBytes(SerializableTypeDescriptor.java:155) 
    at org.hibernate.type.descriptor.java.SerializableTypeDescriptor.wrap(SerializableTypeDescriptor.java:130) 
    at org.hibernate.type.descriptor.java.SerializableTypeDescriptor.wrap(SerializableTypeDescriptor.java:44) 
    at org.hibernate.type.descriptor.sql.VarbinaryTypeDescriptor$2.doExtract(VarbinaryTypeDescriptor.java:71) 
    at org.hibernate.type.descriptor.sql.BasicExtractor.extract(BasicExtractor.java:64) 
    at org.hibernate.type.AbstractStandardBasicType.nullSafeGet(AbstractStandardBasicType.java:267) 
    at org.hibernate.type.AbstractStandardBasicType.nullSafeGet(AbstractStandardBasicType.java:263) 
    at org.hibernate.type.AbstractStandardBasicType.nullSafeGet(AbstractStandardBasicType.java:253) 
    at org.hibernate.type.AbstractStandardBasicType.hydrate(AbstractStandardBasicType.java:338) 
    at org.hibernate.persister.entity.AbstractEntityPersister.hydrate(AbstractEntityPersister.java:2969) 
    at org.hibernate.loader.plan.exec.process.internal.EntityReferenceInitializerImpl.loadFromResultSet(EntityReferenceInitializerImpl.java:324) 
    at org.hibernate.loader.plan.exec.process.internal.EntityReferenceInitializerImpl.hydrateEntityState(EntityReferenceInitializerImpl.java:251) 
    at org.hibernate.loader.plan.exec.process.internal.AbstractRowReader.readRow(AbstractRowReader.java:107) 
    at org.hibernate.loader.plan.exec.internal.EntityLoadQueryDetails$EntityLoaderRowReader.readRow(EntityLoadQueryDetails.java:255) 
    at org.hibernate.loader.plan.exec.process.internal.ResultSetProcessorImpl.extractResults(ResultSetProcessorImpl.java:129) 
    at org.hibernate.loader.plan.exec.internal.AbstractLoadPlanBasedLoader.executeLoad(AbstractLoadPlanBasedLoader.java:138) 
    at org.hibernate.loader.plan.exec.internal.AbstractLoadPlanBasedLoader.executeLoad(AbstractLoadPlanBasedLoader.java:102) 
    at org.hibernate.loader.entity.plan.AbstractLoadPlanBasedEntityLoader.load(AbstractLoadPlanBasedEntityLoader.java:186) 
    at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:4126) 
    at org.hibernate.event.internal.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:503) 
    at org.hibernate.event.internal.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:468) 
    at org.hibernate.event.internal.DefaultLoadEventListener.load(DefaultLoadEventListener.java:213) 
    at org.hibernate.event.internal.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:275) 
    at org.hibernate.event.internal.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:151) 
    at org.hibernate.internal.SessionImpl.fireLoad(SessionImpl.java:1070) 
    at org.hibernate.internal.SessionImpl.internalLoad(SessionImpl.java:989) 
    at org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:716) 
    at org.hibernate.type.EntityType.resolve(EntityType.java:502) 
    at org.hibernate.engine.internal.TwoPhaseLoad.doInitializeEntity(TwoPhaseLoad.java:170) 
    at org.hibernate.engine.internal.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:144) 
    at org.hibernate.loader.plan.exec.process.internal.AbstractRowReader.performTwoPhaseLoad(AbstractRowReader.java:244) 
    at org.hibernate.loader.plan.exec.process.internal.AbstractRowReader.finishUp(AbstractRowReader.java:215) 
    at org.hibernate.loader.plan.exec.process.internal.ResultSetProcessorImpl.extractResults(ResultSetProcessorImpl.java:140) 
    at org.hibernate.loader.plan.exec.internal.AbstractLoadPlanBasedLoader.executeLoad(AbstractLoadPlanBasedLoader.java:138) 
    at org.hibernate.loader.plan.exec.internal.AbstractLoadPlanBasedLoader.executeLoad(AbstractLoadPlanBasedLoader.java:102) 
    at org.hibernate.loader.entity.plan.AbstractLoadPlanBasedEntityLoader.load(AbstractLoadPlanBasedEntityLoader.java:186) 
    at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:4126) 
    at org.hibernate.event.internal.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:503) 
    at org.hibernate.event.internal.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:468) 
    at org.hibernate.event.internal.DefaultLoadEventListener.load(DefaultLoadEventListener.java:213) 
    at org.hibernate.event.internal.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:146) 
    at org.hibernate.internal.SessionImpl.fireLoad(SessionImpl.java:1070) 
    at org.hibernate.internal.SessionImpl.immediateLoad(SessionImpl.java:976) 
    at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:174) 
    at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:286) 
    at com.fasterxml.jackson.datatype.hibernate4.HibernateProxySerializer.findProxied(HibernateProxySerializer.java:167) 
    at com.fasterxml.jackson.datatype.hibernate4.HibernateProxySerializer.serialize(HibernateProxySerializer.java:85) 
    at com.fasterxml.jackson.datatype.hibernate4.HibernateProxySerializer.serialize(HibernateProxySerializer.java:27) 
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:505) 
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:639) 
    ... 57 common frames omitted 
Caused by: java.io.StreamCorruptedException: invalid stream header: 62006100 
    at java.io.ObjectInputStream.readStreamHeader(Unknown Source) 
    at java.io.ObjectInputStream.<init>(Unknown Source) 
    at org.hibernate.internal.util.SerializationHelper$CustomObjectInputStream.<init>(SerializationHelper.java:328) 
    at org.hibernate.internal.util.SerializationHelper$CustomObjectInputStream.<init>(SerializationHelper.java:318) 
    at org.hibernate.internal.util.SerializationHelper.doDeserialize(SerializationHelper.java:237) 
    ... 108 common frames omitted 

Answer 1

根据你的情况下，你可以试试这个：

MVC控制器 - Spring将处理JSON转换with @RequestBody

@Autowired 
AdjustersDAO adjustersDao; 

@Controller 
@RequestMapping("/hello") 
public class HelloController { 

    @RequestMapping(value="/adjusters", method=RequestMethod.GET) 
    public @ResponseBody List<Adjuster> getAll() { 
     return adjustersDao.findAll(); 
    } 
} 

或

REST Web服务

@RestController 
public class HelloController { 

    @RequestMapping(value="/adjusters", method = RequestMethod.GET, headers="Accept=application/json") 
    public List<Adjuster> getAll() { 
     return adjustersDao.findAll(); 
    } 
} 

您还需要一个JSON库像杰克逊：

<dependency> 
    <groupId>org.codehaus.jackson</groupId> 
    <artifactId>jackson-mapper-asl</artifactId> 
    <version>${latest.version}</version> 
</dependency> 

Answer 2

我跑过这样的： NetBeans Hibernate reverse engineering data types mismatch，它解决了我的问题。显然，Hibernate在与EagleUsers有关的表格中的nvarchar列遇到麻烦，Jackson试图序列化它们时突然断了。告诉Hibernate在hibernate.reveng.xml中将nvarchar映射到String，然后重新生成修复它的映射。