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

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

We are currently enhancing an already existing web application in Spring
MVC (and I'm just learning the framework). I tried adding another property
to an object that is being pushed into a database (I added the
corresponding column, too) but I keep getting the
NullValueInNestedPathException error.
I already tried Google and the suggestions were as follows:
1) explicitly declare the constructor for the new property (tried, didn't
solve it)
2) make sure you instantiate the new object (tried, didn't solve it)
3) double check getters/setters of the property (they were OK, wasn't the
error)
4) create a serialVersionUID (nah!)
5) use debug feature (I did, and I found out that the property is null)
Please help! T.T Here are the codes:
VO of the new property:
public class ShiftAssignmentLookupVO implements Serializable{
...
public ShiftAssignmentLookupVO(){}
public String getShiftAssignmentStringValue(){
return shiftAssignmentStringValue;
}
public void setShiftAssignmentStringValue(String
shiftAssignmentStringValue){
this.shiftAssignmentStringValue = shiftAssignmentStringValue;
}
...
}
VO of the object that contains the 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 is the 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 where I try to access the property:
<spring:bind path =
"employeecalendar.empCalList[${ecl.index}].shiftAssignmentVO.shiftAssignmentID">
...
</spring:bind>
And last (whew!) the stack trace:
Aug 8, 2013 10:36:18 AM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for 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' is null
at
org.springframework.beans.BeanWrapperImpl.getNestedBeanWrapper(BeanWrapperImpl.java:443)
at
org.springframework.beans.BeanWrapperImpl.getBeanWrapperForPropertyPath(BeanWrapperImpl.java:418)
at
org.springframework.beans.BeanWrapperImpl.getBeanWrapperForPropertyPath(BeanWrapperImpl.java:419)
at
org.springframework.beans.BeanWrapperImpl.getPropertyValue(BeanWrapperImpl.java:524)
at
org.springframework.validation.AbstractPropertyBindingResult.getActualFieldValue(AbstractPropertyBindingResult.java:78)
at
org.springframework.validation.AbstractBindingResult.getFieldValue(AbstractBindingResult.java:337)
at
org.springframework.web.servlet.support.BindStatus.<init>(BindStatus.java:119)
at
org.springframework.web.servlet.tags.BindTag.doStartTagInternal(BindTag.java:116)
at
org.springframework.web.servlet.tags.RequestContextAwareTag.doStartTag(RequestContextAwareTag.java:77)
at
org.apache.jsp.WEB_002dINF.jsp.employee.employeecalendar_jsp._jspService(employeecalendar_jsp.java:1184)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:388)
at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
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.ApplicationDispatcher.invoke(ApplicationDispatcher.java:646)
at
org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:551)
at
org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:488)
at
org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:968)
at
org.apache.jasper.runtime.PageContextImpl.include(PageContextImpl.java:624)
at
org.apache.struts.tiles.TilesUtilImpl.doInclude(TilesUtilImpl.java:135)
at org.apache.struts.tiles.TilesUtil.doInclude(TilesUtil.java:149)
at org.apache.struts.tiles.taglib.InsertTag.doInclude(InsertTag.java:761)
at
org.apache.struts.tiles.taglib.InsertTag$InsertHandler.doEndTag(InsertTag.java:893)
at org.apache.struts.tiles.taglib.InsertTag.doEndTag(InsertTag.java:462)
at
org.apache.jsp.WEB_002dINF.jsp.defaultLayout_jsp._jspx_meth_tiles_005finsert_005f1(defaultLayout_jsp.java:286)
at
org.apache.jsp.WEB_002dINF.jsp.defaultLayout_jsp._jspService(defaultLayout_jsp.java:115)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:388)
at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
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.ApplicationDispatcher.invoke(ApplicationDispatcher.java:646)
at
org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:436)
at
org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:374)
at
org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:302)
at
org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:145)
at
org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:251)
at
org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1144)
at
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:880)
at
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:793)
at
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:476)
at
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:431)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
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:293)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602)
at
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:595)
Hi drurenia, here is the empCalManager as 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;
}
...
}
Any ideas? Suggestions? Thanks to anyone who will help!
*PS if some codes/part of codes that are missing in this post, kindly
inform me so I can post them.