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POHow can I validate a complex model object in Spring 3 using @Valid annotations?
 

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  1. POHow can I validate a complex model object in Spring 3 using @Valid annotations?
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    <p>I have a model object modelling a purchase order. The purchase order has a few fields (such as ID and date) and a list of line-items as ArrayList. I can validate the parent purchase order ok, but it chokes when validating the line-items.</p> <p>Can anyone help me with validation of complex objects? If I cannot validate complex objects auto-magically, how can I write a custom validator that relies upon the constraint annotations in the parent and then iterates over the child line-items? This Validator instance needs to be able to call <code>something.validate(purchaseOrder)</code> and (for each line-item) <code>something.validate(lineItem)</code>. Where do I get "something" from?</p> <p>I have specified <code>&lt;mvc:annotation-driven /&gt;</code> in <code>dispatcher-servlet</code>. I am not using <code>@InitBinder</code>. And I am using <code>@Valid</code> annotation for validation in controller's method like</p> <pre><code> @RequestMapping(params="confirmPurchaseOrder") public String confirm( @ModelAttribute("purchaseOrder") @Valid PurchaseOrder purchaseOrder, BindingResult result, @RequestParam("account") String accountString, @RequestParam("division") String divisionString, Model model) { if (result.hasErrors()) { return PURCHASE_ORDER_CREATE_VIEW; } </code></pre> <p>The domain classes look like this: -</p> <pre><code>public class PurchaseOrder implements Comparable&lt;PurchaseOrder&gt; { /** Based on GUID */ private String id; /** SOP */ @NotNull private Integer SOP; /** Reference from client */ @NotBlank private String purchaseOrderReference; /** PO date */ @DateTimeFormat(style="S-") @NotNull private Date date; @Valid private final Collection&lt;LineItem&gt; lineItems = new ArrayList&lt;LineItem&gt;(); </code></pre> <p>And</p> <pre><code>public class LineItem { ...Elided /** Generated from GUID */ private String id; @NotNull @DateTimeFormat(style="S-") @Future private Date expiry; private String softwareVersion; @NotNull @NumberFormat(style = Style.NUMBER) @Min(1) private Integer licenceCount; </code></pre> <p>When committing a Purchase Order with an empty expiry date, I get the following exception:</p> <pre><code>org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.springframework.beans.InvalidPropertyException: Invalid property 'lineItems[]' of bean class [com.nit.ols.domain.PurchaseOrder]: Invalid index in property path 'lineItems[]'; nested exception is java.lang.NumberFormatException: For input string: "" org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:730) org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:634) javax.servlet.http.HttpServlet.service(HttpServlet.java:641) javax.servlet.http.HttpServlet.service(HttpServlet.java:722) </code></pre>
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    1. USDavid Kerr
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