Hibernate:could not fetch initial value

Programação Java
#1

da dando esse erro num simples saveUser()… vai o codigo completo do erro ai…

root cause

org.hibernate.exception.SQLGrammarException: could not fetch initial value
	org.hibernate.exception.ErrorCodeConverter.convert(ErrorCodeConverter.java:70)
	org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
	org.hibernate.id.IncrementGenerator.getNext(IncrementGenerator.java:107)
	org.hibernate.id.IncrementGenerator.generate(IncrementGenerator.java:45)
	org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:85)
	org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:184)
	org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:33)
	org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:173)
	org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:27)
	org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:69)
	org.hibernate.impl.SessionImpl.save(SessionImpl.java:481)
	org.hibernate.impl.SessionImpl.save(SessionImpl.java:476)
	hibernate.AcervoFacade.saveAcervo(AcervoFacade.java:13)
	hibernate.AcervoFacade.generate(AcervoFacade.java:21)
	org.apache.jsp.index_jsp._jspService(index_jsp.java:64)
	org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:332)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
	org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:362)
#2