Spring MVC usage of form:radiobuttons to bind data (whole object not only one value) - forms

Question

I have a problem with sending data to backend by POST from my JSP using construction:
<form:radiobuttons path="pvClCategory" items="${categoryList}" itemLabel="clcaCategory"/>
After sumbit my Jboss (version 5) displays:
HTTP Status 400 - description: The request sent by the client was syntactically incorrect ().
I don't know how to see sent request. When I am using construction below everything works fine but I do not want to bind only one value from object, but whole object:
<form:radiobuttons path="pvClCategory.clcaCategory" items="${categoryList}" itemValue="clcaCategory" itemLabel="clcaCategory"/>
So, the first form construction (with binding whole object) cause me a problem. Form is initialised properly it means that radio options are correctly displayed and correct value is selected on jsp site. But problem appears when I want to submit the form, i receive error (HTTP Status 400 request sent by client was syntactically incorrect). Any idea why? What I am doing wrong?
My code:
I have one entity class Violation with field named pvClCategory type of ClCategory
#Entity
#Table(name="PV_VIOLATIONS")
public class Violation implements Serializable {
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy=GenerationType.AUTO)
#Column(name="VIOL_ID")
private Long id;
#ManyToOne
#JoinColumn(name="VIOL_CLCA_ID")
private ClCategory pvClCategory;
/* others fields and getters/setters */
}
My ClCategory entity class which is needed to bind it to Violation.pvClCategory field:
#Entity
#Table(name="PV_CL_CATEGORIES")
#Cache(usage=CacheConcurrencyStrategy.READ_ONLY)
public class ClCategory implements Serializable {
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy=GenerationType.AUTO)
#Column(name="CLCA_ID")
private long clcaId;
#Column(name="CLCA_CATEGORY")
private String clcaCategory;
#OneToMany(mappedBy="pvClCategory")
private List<Violation> pvViolations;
public ClCategory() {
}
public long getClcaId() {
return this.clcaId;
}
public void setClcaId(long clcaId) {
this.clcaId = clcaId;
}
public String getClcaCategory() {
return this.clcaCategory;
}
public void setClcaCategory(String clcaCategory) {
this.clcaCategory = clcaCategory;
}
public List<Violation> getPvViolations() {
return this.pvViolations;
}
public void setPvViolations(List<Violation> pvViolations) {
this.pvViolations = pvViolations;
}
#Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + (int) (clcaId ^ (clcaId >>> 32));
return result;
}
#Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
ClCategory other = (ClCategory) obj;
if (clcaId != other.clcaId)
return false;
return true;
}
}
This Violation class is used in my form in commandName property as follows (file name: v.jsp):
<form:form action="../update" method="post" commandName="violation">
<form:radiobuttons path="pvClCategory" items="${categoryList}" itemLabel="clcaCategory"/>
<!-- other fields -->
<button type="submit" value="Apply Changes" class="button-default" >Apply</button>
</form:form>
My controller:
#Controller
#RequestMapping("/viol")
public class ViolationController {
#RequestMapping("edit/{violationId}")
public String edit(#PathVariable("violationId") long id, Map<String, Object> map) {
Violation violation = violationService.getViolation(id);
map.put("violation",violation);
map.put("categoryList", adminService.listCategories());
return "v";
}
}
As I understand in the construction form:radiobuttons path="" items="" the path is property for data binding so whole object from delivered list in items should be binded to it. I put in items List of my categories which are objects of type ClCategory. After submit error appears.
When i use form:radiobuttons path="pvClCategory.clcaCategory" items="${categoryList}" itemValue="clcaCategory" itemLabel="clcaCategory" to bind only String value from object in items (in both cases is used the same object list of type ClCategory) then the form is correctly submited but I do not want to bind only one value of objecte but whole object. Could you help me what am I doing wrong?