Let's say we have:
class Car:
public class Car{
private String model;
private String brand;
private Collection<People> owners;
//constructor,getters and setters
}
Class People:
public class People{
private Car car;
private String name;
private Gender gender;
//constructor,getters and setters
}
Class Gender:
public class Gender{
private Char gender;
//constructor,getters and setters
}
Then if i want to pass the collection owners to my view:
<body>
<h1>Car detail: </h1>
<h2>Owners: </h2>
<table>
<form:form modelAttribute="owners" method="post" action="processOwnersSelection.htm">
<tr>
<td>
<ul>
<form:checkboxes element="li" path="owners" items="${owners}"></form:checkboxes>
</ul>
</td>
</tr>
<tr>
<td>
<button type="submit">Next</button>
</td>
</tr>
</form:form>
</table>
</body>
By my Controller:
@RequestMapping(value = "/selectOwners")
protected ModelAndView showOwnersSelection() throws ServiceException{
return new ModelAndView("car/ownerSelection", "owners", super.getService().getAllOwners());
}
Note. This will be used to connect multiple owners (who existe in out DB) to a car.
i'll get an error:
org.springframework.beans.NotReadablePropertyException: Invalid property 'owners' of bean class [java.util.HashMap$Values]: Bean property 'owners' is not readable or has an invalid getter method: Does the return type of the getter match the parameter type of the setter?
As far as I understand Spring converts these by using implamentations of PropertyEditor or Converter ?
So I should manually write one, but then how will Spring know i made one he(or she) has to use ? And how should one look like ?
Spring 3 Type Converter SPI supercedes JavaBean PropertyEditors.
<mvc:annotation-driven />in the configuration file will automatically install default type converters. We can override defaults with annotations such as @DateTimeFormat or @NumberFormat.For custom field types, we can follow below convention over configuration:
Define a static valueOf(String) method or Constructor(String) to parse your value from its String representation
Implement toString() to print your value for display
See this link for more details.