How to pass a more dynamic structure to jsp Spring Forms? - spring

Question

I have a structure:
public class Tabl {
String tableName;
List<String> tableColumns;
public Tabl() {
}
public String getTableName() {
return tableName;
}
public void setTableName(String tableName) {
this.tableName = tableName;
}
public List<String> getTableColumns() {
return tableColumns;
}
public void setTableColumns(List<String> tableColumns) {
this.tableColumns = tableColumns;
}
}
This form is emulating a table dynamically so to say. I have lots of simple tables with 1-2 columns except the id. I don't have an explicit assignment of fields as I have only one dynamic entity to hold them. The point of my question here is that I want to pass this tabl object and prepare a Spring form in jsp like this (I pass tableName from another JSP and it's ok:
#RequestMapping(value = "/addnew/{tableName}")
public String insertForm(#PathVariable("tableName") String tableName, Model m) {
Tabl tabl = new Tabl();
tabl.setTableName(tableName);
List<String> cols = spravochnikService.selectCols(tableName); //prepares structure by getting column names of the needed table (except the id): for example tableName=Employee, cols are firstname and lastname
tabl.setTableColumns(cols);
m.addAttribute("command", tabl);
return "insert_form"
}
insert_form.jsp:
<f:form action="${url_csave}">
<table border="1">
<c:forEach var="col" items="${command.tableColumns}">
<tr>
<td>
<c:out value="col" />
<f:input path="col" />
</td>
</tr>
</c:forEach>
<tr>
<td colspan="2" align="right">
<button>Save</button>
</td>
</tr>
</table>
</f:form>
When I try to do it it says invalid property "firstname" and invalid getter method. I can't have an explicit getter for it of course as all my tables are all in one dynamic entity. How to make Spring Forms understand the structure?