三大框架整合，保存数据时报错

Question

在控制台就输出这个  
Hibernate: 
    select
        hibernate_sequence.nextval 
    from
        dual
        
        页面上输出这个
        Struts Problem Report
Struts has detected an unhandled exception:
Messages:    ORA-02289: ?????could not get next sequence valuecould not get next sequence value; SQL [select hibernate_sequence.nextval from dual]; nested exception is org.hibernate.exception.SQLGrammarException: could not get next sequence value    
File:    oracle/jdbc/driver/T4CTTIoer.java    
Line number:    439    
Stacktraces
org.springframework.dao.InvalidDataAccessResourceUsageException: could not get next sequence value; SQL [select hibernate_sequence.nextval from dual]; nested exception is org.hibernate.exception.SQLGrammarException: could not get next sequence value
    org.springframework.orm.hibernate3.SessionFactoryUtils.convertHibernateAccessException(SessionFactoryUtils.java:635)
    org.springframework.orm.hibernate3.HibernateAccessor.convertHibernateAccessException(HibernateAccessor.java:412)
    org.springframework.orm.hibernate3.HibernateTemplate.doExecute(HibernateTemplate.java:411)
    org.springframework.orm.hibernate3.HibernateTemplate.executeWithNativeSession(HibernateTemplate.java:374)
    org.springframework.orm.hibernate3.HibernateTemplate.save(HibernateTemplate.java:683)
    dao.impl.EasybuyUserDaoImpl.save(EasybuyUserDaoImpl.java:30)
    service.impl.EasybuyUserServiceImpl.save(EasybuyUserServiceImpl.java:32)
    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.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:318)
    org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
    org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
    org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
    org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
    org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:90)
    org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
    org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
    com.sun.proxy.$Proxy4.save(Unknown Source)