org.springframework.orm.hibernate3.HibernateSystemException: a different object with the same identifier value was already associated with the session: [scheduler.Employee#93]; nested exception is org.hibernate.NonUniqueObjectException: a different object with the same identifier value was already associated with the session: [scheduler.Employee#93]
org.hibernate.NonUniqueObjectException: a different object with the same identifier value was already associated with the session: [scheduler.Employee#93]
   at org.hibernate.engine.PersistenceContext.checkUniqueness(PersistenceContext.java:586)
   at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.performUpdate(DefaultSaveOrUpdateEventListener.java:254)
   at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsDetached(DefaultSaveOrUpdateEventListener.java:214)
   at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:91)
   at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:69)
   at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:468)
   at org.hibernate.engine.Cascades$5.cascade(Cascades.java:154)
   at org.hibernate.engine.Cascades.cascadeAssociation(Cascades.java:771)
   at org.hibernate.engine.Cascades.cascade(Cascades.java:720)
   at org.hibernate.engine.Cascades.cascadeCollection(Cascades.java:895)
   at org.hibernate.engine.Cascades.cascadeAssociation(Cascades.java:792)
   at org.hibernate.engine.Cascades.cascade(Cascades.java:720)
   at org.hibernate.engine.Cascades.cascade(Cascades.java:847)
   at org.hibernate.engine.Cascades.cascade(Cascades.java:819)
   at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.cascadeOnUpdate(DefaultSaveOrUpdateEventListener.java:316)
   at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.performUpdate(DefaultSaveOrUpdateEventListener.java:299)
   at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsDetached(DefaultSaveOrUpdateEventListener.java:214)
   at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:91)
   at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:69)
   at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:468)
   at org.hibernate.engine.Cascades$5.cascade(Cascades.java:154)
   at org.hibernate.engine.Cascades.cascadeAssociation(Cascades.java:771)
   at org.hibernate.engine.Cascades.cascade(Cascades.java:720)
   at org.hibernate.engine.Cascades.cascadeCollection(Cascades.java:895)
   at org.hibernate.engine.Cascades.cascadeAssociation(Cascades.java:792)
   at org.hibernate.engine.Cascades.cascade(Cascades.java:720)
   at org.hibernate.engine.Cascades.cascade(Cascades.java:847)
   at org.hibernate.engine.Cascades.cascade(Cascades.java:819)
   at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.cascadeOnUpdate(DefaultSaveOrUpdateEventListener.java:316)
   at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.performUpdate(DefaultSaveOrUpdateEventListener.java:299)
   at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsDetached(DefaultSaveOrUpdateEventListener.java:214)
   at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:91)
   at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:69)
   at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:468)
   at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:463)
   at org.springframework.orm.hibernate3.HibernateTemplate$18.doInHibernate(HibernateTemplate.java:693)
   at org.springframework.orm.hibernate3.HibernateTemplate.execute(HibernateTemplate.java:366)
   at org.springframework.orm.hibernate3.HibernateTemplate.saveOrUpdate(HibernateTemplate.java:690)
   at scheduler.dao.impl.HibEmployeeDAO.merge(HibEmployeeDAO.java:51)
   at scheduler.employee.EmployeeController.saveemployee(EmployeeController.java:250)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
   at java.lang.reflect.Method.invoke(Method.java:585)
   at org.springframework.web.servlet.mvc.multiaction.MultiActionController.invokeNamedMethod(MultiActionController.java:393)
   at org.springframework.web.servlet.mvc.multiaction.MultiActionController.handleRequestInternal(MultiActionController.java:331)
   at org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:153)
   at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:44)
   at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:723)
   at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:663)
   at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:394)
   at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:348)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
   at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:264)
   at org.acegisecurity.intercept.web.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:107)
   at org.acegisecurity.intercept.web.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:72)
   at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:274)
   at org.acegisecurity.ui.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:110)
   at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:274)
   at org.acegisecurity.ui.AbstractProcessingFilter.doFilter(AbstractProcessingFilter.java:216)
   at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:274)
   at org.acegisecurity.context.HttpSessionContextIntegrationFilter.doFilter(HttpSessionContextIntegrationFilter.java:195)
   at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:274)
   at org.acegisecurity.util.FilterChainProxy.doFilter(FilterChainProxy.java:148)
   at org.acegisecurity.util.FilterToBeanProxy.doFilter(FilterToBeanProxy.java:90)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:186)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
   at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
   at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
   at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
   at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)
   at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)
   at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
   at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
   at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
   at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
   at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
   at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
   at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118)
   at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
   at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
   at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
   at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
   at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
   at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
   at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
   at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
   at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
   at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
   at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
   at java.lang.Thread.run(Thread.java:595)

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD//En"
    "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
   
<hibernate-mapping default-lazy="false">
    <class name="scheduler.Employee" table="employee">
        <id name="id" unsaved-value="-1">
            <generator class="native"/>
        </id>
        <property name="name" column="name" not-null="true"/>
        <property name="dateCreated" not-null="true"/>
        <property name="payRate"/>
        <property name="payScale"/>
        <property name="minHours" column="min_hours"/>
        <property name="maxHours" column="max_hours"/>
        <property name="maxPay" column="max_pay"/>
        <property name="minPay" column="min_pay"/>
        <property name="email" column="email"/>
        <many-to-one name="user" class="scheduler.User" column="user_id" unique="true"/>
        <many-to-one name="corporation"
            column="corporation_id"
            class="scheduler.Corporation"/>
        <set name="locations" cascade="save-update" table="employee_location" lazy="false">
            <key column="employee_id"/>
            <many-to-many class="scheduler.Location" column="location_id"/>
        </set>
        <set name="EPLinks" cascade="all" inverse="true">
            <key column="employee_id"/>
            <one-to-many class="scheduler.EPLink"/>
        </set>
        <set name="SELinks" cascade="all" inverse="true">
            <key column="employee_id"/>
            <one-to-many class="scheduler.SELink"/>
        </set>
        <set name="calender" inverse="true" cascade="all">
            <key column="employee_id"/>
            <one-to-many class="scheduler.Calender"/>
        </set>
        <set name="fixedCalender" inverse="true" cascade="all">
            <key column="employee_id"/>
            <one-to-many class="scheduler.employee.fixedcalender.FixedCalender"/>
        </set>
    </class>
</hibernate-mapping>

public ModelAndView saveemployee(HttpServletRequest request, HttpServletResponse response) throws Exception{
        // Get Location
        String error = null;
        Location location = null;
        boolean newEmployee = false;
        try{
            location = getLocationDAO().get(Integer.parseInt(request.getParameter("location")));
           
            // If we're editing an employee.
            int id = Integer.parseInt(request.getParameter("id"));
            logger.debug("Searching for employee with id " +id);
            Employee employee = getEmployeeDAO().get(id);
            if(employee != null)
                logger.debug("Found employee and his name is " +employee.getName());
            // If we're making a new employee.
            if(employee == null){
                logger.debug("Making a new employee.");
                employee = new Employee();
                newEmployee = true;
            }
           
            // Set properties
            employee.setName(request.getParameter("name"));
            employee.getLocations().add(location);
            employee.setCorporation(location.getCorporation());
            employee.setEmail(request.getParameter("email"));
            if(!newEmployee){
                employee.setMaxHours(Integer.parseInt(request.getParameter("maxhours")));
                employee.setMinHours(Integer.parseInt(request.getParameter("minhours")));
            }
            logger.debug("Employee's properties have been modified.");
            if(request.getParameter("payrate") != null){
                employee.setPayRate(Integer.parseInt(request.getParameter("payrate")));
            } else {
                employee.setPayRate(0);
            }
            if(request.getParameter("payscale") != null){
                employee.setPayScale(Integer.parseInt(request.getParameter("payscale")));
            } else {
                employee.setPayScale(0);
            }           
            // Clear the EPLinks out
            logger.debug("Checking out the epLinks of the employee");
            for (Iterator ep = employee.getEPLinks().iterator(); ep.hasNext();) {
                EPLink elem = (EPLink) ep.next();
                logger.debug("Getting the next EPLink. It is " +elem);
                elem.getPosition().getEPLinks().remove(elem);
                getEPLinkDAO().delete(elem);
            }
            employee.getEPLinks().clear();
            //getEmployeeDAO().save(employee);
           
            // Make new EPLinks
            logger.debug("About to test positions");
            String[] positions = request.getParameterValues("position");
            if(positions != null){
                logger.debug("Positions is not null");
                for (int p = 0; p < positions.length; p++) {
                    int pid = Integer.parseInt(positions[p]);
                    Position pos = getPositionDAO().get(pid);
                    logger.debug("Positions are being found.");
                    if(pos != null){
                        EPLink epl = new EPLink(pos, employee);
                        pos.getEPLinks().add(epl);
                        employee.getEPLinks().add(epl);
                    }
                }
            }
            logger.debug("saving employees");

                getEmployeeDAO().save(employee);
            logger.debug("Done.");
           
            // Return XML.
            response.getWriter().println("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
            response.getWriter().println("<response>");
            //response.getWriter().println("    <ident>" + request.getParameter("ident") + "</ident>");
            response.getWriter().println("    <newid>" + employee.getId() + "</newid>");
            if(error != null){
                response.getWriter().println("    <error>" + error + "</error>");
            }
            response.getWriter().println("</response>");
            return null;
        } catch (Exception ex){
            response.getWriter().println("error");
            response.getWriter().flush();
            logger.error("There was an unrecoverable error", ex);
            throw ex;
        }
    }