Spring MVC/Hibernate - NullValueInNestedPathException, Invalid property, value of nested property is null? -

we enhancing already existing web application in spring mvc (and i'm learning framework). tried adding property object being pushed database (i added corresponding column, too) keep getting nullvalueinnestedpathexception error.

i tried google , suggestions follows:

1) explicitly declare constructor new property (tried, didn't solve it)
2) make sure instantiate new object (tried, didn't solve it)
3) double check getters/setters of property (they ok, wasn't error)
4) create serialversionuid (nah!)
5) use debug feature (i did, , found out property is null)

please help! t.t here codes:

vo of new property:

public class shiftassignmentlookupvo implements serializable{      ...     public shiftassignmentlookupvo(){}      public string getshiftassignmentstringvalue(){      return shiftassignmentstringvalue;     }     public void setshiftassignmentstringvalue(string shiftassignmentstringvalue){      this.shiftassignmentstringvalue = shiftassignmentstringvalue;     }     ... } 

vo of object contains property:

public class employeecalendarvo implements serializable {     ...     //the new property:     private shiftassignmentlookupvo shiftassignmentvo = new shiftassignmentlookupvo();      public void setshiftassignmentvo(shiftassignmentlookupvo shiftassignmentvo){       this.shiftassignmentvo = shiftassignmentvo;     }     public shiftassignmentlookupvo getshiftassignmentvo(){       return shiftassignmentvo;     }     ... } 

and here hibernate mapping:

<class name = "employeecalendarvo" table = "emp_wrk_cdr">     ...     <many-to-one name = "shiftassignmentvo" lazy = "false">         <column name = "id_assignment" />     </many-to-one>     ... </class> 

the jsp try access property:

<spring:bind path = "employeecalendar.empcallist[${ecl.index}].shiftassignmentvo.shiftassignmentid">    ... </spring:bind> 

and last (whew!) stack trace:

aug 8, 2013 10:36:18 org.apache.catalina.core.standardwrappervalve invoke severe: servlet.service() servlet dtr threw exception org.springframework.beans.nullvalueinnestedpathexception: invalid property     'empcallist[0].shiftassignmentvo' of bean class     [com.safeway.dtr.employee.vo.empcalmanager]: value of nested property     'empcallist[0].shiftassignmentvo' null     @ org.springframework.beans.beanwrapperimpl.getnestedbeanwrapper(beanwrapperimpl.java:443)     @ org.springframework.beans.beanwrapperimpl.getbeanwrapperforpropertypath(beanwrapperimpl.java:418)     @ org.springframework.beans.beanwrapperimpl.getbeanwrapperforpropertypath(beanwrapperimpl.java:419)     @ org.springframework.beans.beanwrapperimpl.getpropertyvalue(beanwrapperimpl.java:524)     @ org.springframework.validation.abstractpropertybindingresult.getactualfieldvalue(abstractpropertybindingresult.java:78)     @ org.springframework.validation.abstractbindingresult.getfieldvalue(abstractbindingresult.java:337)     @ org.springframework.web.servlet.support.bindstatus.<init>(bindstatus.java:119) @ org.springframework.web.servlet.tags.bindtag.dostarttaginternal(bindtag.java:116)     @ org.springframework.web.servlet.tags.requestcontextawaretag.dostarttag(requestcontextawaretag.java:77)     @ org.apache.jsp.web_002dinf.jsp.employee.employeecalendar_jsp._jspservice(employeecalendar_jsp.java:1184)     @ org.apache.jasper.runtime.httpjspbase.service(httpjspbase.java:70)     @ javax.servlet.http.httpservlet.service(httpservlet.java:717)     @ org.apache.jasper.servlet.jspservletwrapper.service(jspservletwrapper.java:388)     @ org.apache.jasper.servlet.jspservlet.servicejspfile(jspservlet.java:313)     @ org.apache.jasper.servlet.jspservlet.service(jspservlet.java:260)     @ javax.servlet.http.httpservlet.service(httpservlet.java:717)     @ org.apache.catalina.core.applicationfilterchain.internaldofilter(applicationfilterchain.java:290)     @ org.apache.catalina.core.applicationfilterchain.dofilter(applicationfilterchain.java:206)     @ org.apache.catalina.core.applicationdispatcher.invoke(applicationdispatcher.java:646)     @ org.apache.catalina.core.applicationdispatcher.doinclude(applicationdispatcher.java:551)     @ org.apache.catalina.core.applicationdispatcher.include(applicationdispatcher.java:488)     @ org.apache.jasper.runtime.jspruntimelibrary.include(jspruntimelibrary.java:968)     @ org.apache.jasper.runtime.pagecontextimpl.include(pagecontextimpl.java:624)     @ org.apache.struts.tiles.tilesutilimpl.doinclude(tilesutilimpl.java:135)     @ org.apache.struts.tiles.tilesutil.doinclude(tilesutil.java:149)     @ org.apache.struts.tiles.taglib.inserttag.doinclude(inserttag.java:761)     @ org.apache.struts.tiles.taglib.inserttag$inserthandler.doendtag(inserttag.java:893)     @ org.apache.struts.tiles.taglib.inserttag.doendtag(inserttag.java:462)     @ org.apache.jsp.web_002dinf.jsp.defaultlayout_jsp._jspx_meth_tiles_005finsert_005f1(defaultlayout_jsp.java:286)     @ org.apache.jsp.web_002dinf.jsp.defaultlayout_jsp._jspservice(defaultlayout_jsp.java:115)     @ org.apache.jasper.runtime.httpjspbase.service(httpjspbase.java:70)     @ javax.servlet.http.httpservlet.service(httpservlet.java:717)     @ org.apache.jasper.servlet.jspservletwrapper.service(jspservletwrapper.java:388)     @ org.apache.jasper.servlet.jspservlet.servicejspfile(jspservlet.java:313)     @ org.apache.jasper.servlet.jspservlet.service(jspservlet.java:260)     @ javax.servlet.http.httpservlet.service(httpservlet.java:717)     @ org.apache.catalina.core.applicationfilterchain.internaldofilter(applicationfilterchain.java:290)     @ org.apache.catalina.core.applicationfilterchain.dofilter(applicationfilterchain.java:206)     @ org.apache.catalina.core.applicationdispatcher.invoke(applicationdispatcher.java:646)     @ org.apache.catalina.core.applicationdispatcher.processrequest(applicationdispatcher.java:436)     @ org.apache.catalina.core.applicationdispatcher.doforward(applicationdispatcher.java:374)     @ org.apache.catalina.core.applicationdispatcher.forward(applicationdispatcher.java:302)     @ org.springframework.web.servlet.view.internalresourceview.rendermergedoutputmodel(internalresourceview.java:145)     @ org.springframework.web.servlet.view.abstractview.render(abstractview.java:251)     @ org.springframework.web.servlet.dispatcherservlet.render(dispatcherservlet.java:1144)     @ org.springframework.web.servlet.dispatcherservlet.dodispatch(dispatcherservlet.java:880)     @ org.springframework.web.servlet.dispatcherservlet.doservice(dispatcherservlet.java:793)     @ org.springframework.web.servlet.frameworkservlet.processrequest(frameworkservlet.java:476)     @ org.springframework.web.servlet.frameworkservlet.doget(frameworkservlet.java:431)     @ javax.servlet.http.httpservlet.service(httpservlet.java:617)     @ javax.servlet.http.httpservlet.service(httpservlet.java:717)     @ org.apache.catalina.core.applicationfilterchain.internaldofilter(applicationfilterchain.java:290)     @ org.apache.catalina.core.applicationfilterchain.dofilter(applicationfilterchain.java:206)     @ org.apache.catalina.core.standardwrappervalve.invoke(standardwrappervalve.java:233)     @ org.apache.catalina.core.standardcontextvalve.invoke(standardcontextvalve.java:191)     @ org.apache.catalina.core.standardhostvalve.invoke(standardhostvalve.java:127)     @ org.apache.catalina.valves.errorreportvalve.invoke(errorreportvalve.java:102)     @ org.apache.catalina.core.standardenginevalve.invoke(standardenginevalve.java:109)     @ org.apache.catalina.connector.coyoteadapter.service(coyoteadapter.java:293)     @ org.apache.coyote.http11.http11processor.process(http11processor.java:859)     @ org.apache.coyote.http11.http11protocol$http11connectionhandler.process(http11protocol.java:602)     @ org.apache.tomcat.util.net.jioendpoint$worker.run(jioendpoint.java:489)     @ java.lang.thread.run(thread.java:595) 

hi drurenia, here empcalmanager requested:

public class empcalmanager {       ...     private list<employeecalendarvo> empcallist = lazylist.decorate(new arraylist<employeecalendarvo>(),factoryutils.instantiatefactory(employeecalendarvo.class));     public list<employeecalendarvo> getempcallist() {         return empcallist;     }     public void setempcallist(list<employeecalendarvo> empcallist) {         this.empcallist = empcallist;     }     ... } 

this piece pulls table:

public list<employeecalendarvo> getemployeeworkcalendar(int empid, date from, date to){     session session = sessionfactory.getcurrentsession();     session.flush();     query query = session.createquery(" employeecalendarvo empwrkcdr " +             "empwrkcdr.employeeid = ? , empwrkcdr.workdate between ? , ? order empwrkcdr.workdate");      query.setinteger(0, empid);      query.setdate(1, from);     query.setdate(2, to);      return query.list(); } 

any ideas? suggestions? thanks help!
*ps if codes/part of codes missing in post, kindly inform me can post them.

i found out wrong: seems set default value of column new property null! hope others getting same error try solution out. -__-! drurenia taking interest! :d