java Hibernate@Lob注释不再有效：不能用几个字符串超过CLOB的总长度？

9 月，2 周 Questions & Answers 3381

当我试图用@lob字符串持久化一个实体时，出现了一个错误。我记得那部分代码运行得很好，我根本不记得修改过它。我很困惑。以下是我对错误的解释：

ERROR 30 04 12 23:50:31 [org.hibernate.util.JDBCExceptionReporter] => Start position [1] cannot exceed overall CLOB length [0] com.vaadin.event.ListenerMethod$MethodException Cause: javax.persistence.PersistenceException: org.hibernate.exception.GenericJDBCException: could not insert: [life.domain_model.Post] at com.vaadin.event.ListenerMethod.receiveEvent(ListenerMethod.java:507) at com.vaadin.event.EventRouter.fireEvent(EventRouter.java:161) at com.vaadin.ui.AbstractComponent.fireEvent(AbstractComponent.java:1154) at com.vaadin.ui.Button.fireClick(Button.java:371) at com.vaadin.ui.Button.changeVariables(Button.java:193) at com.vaadin.terminal.gwt.server.AbstractCommunicationManager.handleVariables(AbstractCommunicationManager.java:1094) at com.vaadin.terminal.gwt.server.AbstractCommunicationManager.doHandleUidlRequest(AbstractCommunicationManager.java:590) at com.vaadin.terminal.gwt.server.CommunicationManager.handleUidlRequest(CommunicationManager.java:266) at com.vaadin.terminal.gwt.server.AbstractApplicationServlet.service(AbstractApplicationServlet.java:476) at org.vaadin.navigator7.NavigableApplicationServlet.service(NavigableApplicationServlet.java:46) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489) at java.lang.Thread.run(Unknown Source) Caused by: javax.persistence.PersistenceException: org.hibernate.exception.GenericJDBCException: could not insert: [life.domain_model.Post] at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1214) at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1147) at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1153) at org.hibernate.ejb.AbstractEntityManagerImpl.merge(AbstractEntityManagerImpl.java:695) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:240) at $Proxy29.merge(Unknown Source) at life.dao.ForumDao.merge(ForumDao.java:24) at life.dao.ForumDao$$FastClassByCGLIB$$6eb7cb5f.invoke() at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:149) at org.springframework.aop.framework.Cglib2AopProxy$CglibMethodInvocation.invokeJoinpoint(Cglib2AopProxy.java:688) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150) at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172) at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:621) at life.dao.ForumDao$$EnhancerByCGLIB$$8ecdd1fd.merge() at life.dao.ForumDaoImpl.mergeDiscussion(ForumDaoImpl.java:29) at life.dao.ForumDaoImpl.saveNewPostForDiscussion(ForumDaoImpl.java:50) at life.dao.ForumDaoImpl$$FastClassByCGLIB$$6d37da1f.invoke() at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:149) at org.springframework.aop.framework.Cglib2AopProxy$CglibMethodInvocation.invokeJoinpoint(Cglib2AopProxy.java:688) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150) at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172) at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:621) at life.dao.ForumDaoImpl$$EnhancerByCGLIB$$66b0b0bd.saveNewPostForDiscussion() at life.ui.layouts.ForumEditorLayout.replyToDiscussion(ForumEditorLayout.java:112) at life.ui.layouts.ForumEditorLayout$3.buttonClick(ForumEditorLayout.java:84) 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 com.vaadin.event.ListenerMethod.receiveEvent(ListenerMethod.java:487) ... 22 more Caused by: org.hibernate.exception.GenericJDBCException: could not insert: [life.domain_model.Post] at org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:140) at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:128) at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66) at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:64) at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2327) at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2834) at org.hibernate.action.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:71) at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:273) at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:320) at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:203) at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:129) at org.hibernate.ejb.event.EJB3MergeEventListener.saveWithGeneratedId(EJB3MergeEventListener.java:62) at org.hibernate.event.def.DefaultMergeEventListener.saveTransientEntity(DefaultMergeEventListener.java:415) at org.hibernate.event.def.DefaultMergeEventListener.mergeTransientEntity(DefaultMergeEventListener.java:341) at org.hibernate.event.def.DefaultMergeEventListener.entityIsTransient(DefaultMergeEventListener.java:303) at org.hibernate.event.def.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:258) at org.hibernate.impl.SessionImpl.fireMerge(SessionImpl.java:877) at org.hibernate.impl.SessionImpl.merge(SessionImpl.java:859) at org.hibernate.engine.CascadingAction$6.cascade(CascadingAction.java:279) at org.hibernate.engine.Cascade.cascadeToOne(Cascade.java:392) at org.hibernate.engine.Cascade.cascadeAssociation(Cascade.java:335) at org.hibernate.engine.Cascade.cascadeProperty(Cascade.java:204) at org.hibernate.engine.Cascade.cascadeCollectionElements(Cascade.java:425) at org.hibernate.engine.Cascade.cascadeCollection(Cascade.java:362) at org.hibernate.engine.Cascade.cascadeAssociation(Cascade.java:338) at org.hibernate.engine.Cascade.cascadeProperty(Cascade.java:204) at org.hibernate.engine.Cascade.cascade(Cascade.java:161) at org.hibernate.event.def.DefaultMergeEventListener.cascadeOnMerge(DefaultMergeEventListener.java:630) at org.hibernate.event.def.DefaultMergeEventListener.entityIsDetached(DefaultMergeEventListener.java:490) at org.hibernate.event.def.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:255) at org.hibernate.event.def.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:84) at org.hibernate.impl.SessionImpl.fireMerge(SessionImpl.java:867) at org.hibernate.impl.SessionImpl.merge(SessionImpl.java:851) at org.hibernate.impl.SessionImpl.merge(SessionImpl.java:855) at org.hibernate.ejb.AbstractEntityManagerImpl.merge(AbstractEntityManagerImpl.java:686) ... 54 more Caused by: java.sql.SQLException: Start position [1] cannot exceed overall CLOB length [0] at org.hibernate.engine.jdbc.ClobProxy.invoke(ClobProxy.java:146) at $Proxy36.getSubString(Unknown Source) at com.mysql.jdbc.PreparedStatement.setClob(PreparedStatement.java:3553) at org.apache.commons.dbcp.DelegatingPreparedStatement.setClob(DelegatingPreparedStatement.java:187) at org.apache.commons.dbcp.DelegatingPreparedStatement.setClob(DelegatingPreparedStatement.java:187) at org.hibernate.type.descriptor.sql.ClobTypeDescriptor$1.doBind(ClobTypeDescriptor.java:60) at org.hibernate.type.descriptor.sql.BasicBinder.bind(BasicBinder.java:89) at org.hibernate.type.AbstractStandardBasicType.nullSafeSet(AbstractStandardBasicType.java:282) at org.hibernate.type.AbstractStandardBasicType.nullSafeSet(AbstractStandardBasicType.java:277) at org.hibernate.type.AbstractSingleColumnStandardBasicType.nullSafeSet(AbstractSingleColumnStandardBasicType.java:85) at org.hibernate.persister.entity.AbstractEntityPersister.dehydrate(AbstractEntityPersister.java:2166) at org.hibernate.persister.entity.AbstractEntityPersister.dehydrate(AbstractEntityPersister.java:2143) at org.hibernate.persister.entity.AbstractEntityPersister$4.bindValues(AbstractEntityPersister.java:2321) at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:56) ... 85 more

这是邮政实体：

@Entity
public class Post {
    @Id @GeneratedValue
    private Long id;
    @ManyToOne @JoinColumn(name = "owner_id")
    private User owner;
    @ManyToOne @JoinColumn(name = "editer_id")
    private User lastEditer;
    private Date creationDate;
    private Date lastEditionDate;
    @Lob
    private String content;
    @ManyToOne @JoinColumn(name = "discussion_id")
    private Discussion discussion;

    public Post(){

    }
    public Post(User owner,String content){
        this.owner = owner;
        this.lastEditer = null;
        Date curent = new Date();
        this.creationDate = curent;
        this.lastEditionDate = curent;
        this.content = content;
        this.discussion = null;
    }


    //G&S
....

无论字符串内容长度如何，我都会得到错误。我仍然在使用hibernate 3.6.0和MySql 5.5（+spring）。有人能告诉我怎么纠正这个吗

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java Hibernate@Lob注释不再有效：不能用几个字符串超过CLOB的总长度？

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