Question

I have specified <mvc:annotation-driven /> in dispatcher-servlet.
I am not using @InitBinder.
And I am using @valid annotation for validation in controller’s method like

@RequestMapping(method = RequestMethod.POST, value = "new")
    public String save(@Valid Article article,ModelMap model) {
//code here
}

And validation works fine, but instead of showing error in ..
sample shown in html code

<tr>
         <td>Title</td>
         <td><form:input path="title"/></td>
         <td><form:errors path="title"/></td>
</tr>

It throws exception like..

org.springframework.web.util.NestedServletException:
Request processing failed; nested
exception is
org.springframework.validation.BindException:
org.springframework.validation.BeanPropertyBindingResult:
2 errors Field error in object
‘article’ on field ‘urlInfo.url’:
rejected value []; codes
[typeMismatch.article.urlInfo.url,typeMismatch.urlInfo.url,typeMismatch.url,typeMismatch.java.net.URL,typeMismatch];
arguments
[org.springframework.context.support.DefaultMessageSourceResolvable:
codes
[article.urlInfo.url,urlInfo.url];
arguments []; default message
[urlInfo.url]]; default message
[Failed to convert property value of
type ‘java.lang.String’ to required
type ‘java.net.URL’ for property
‘urlInfo.url’; nested exception is
org.springframework.core.convert.ConversionFailedException:
Unable to convert value from type
‘java.lang.String’ to type
‘java.net.URL’; nested exception is
org.springframework.core.convert.ConversionFailedException:
Unable to convert value from type
‘java.lang.String’ to type
‘java.net.URL’; nested exception is
java.lang.reflect.InvocationTargetException]
Field error in object ‘article’ on
field ‘title’: rejected value [];
codes
[Size.article.title,Size.title,Size.java.lang.String,Size];
arguments
[org.springframework.context.support.DefaultMessageSourceResolvable:
codes [article.title,title]; arguments
[]; default message
[title],{javax.validation.constraints.Size.message},6,[Ljava.lang.Class;@1db3aac,2147483647,[Ljava.lang.Class;@1e90abf];
default message [size must be between
6 and 2147483647]

 org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:659)
 org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:563)
 javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
 javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
 org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:390)
 org.tuckey.web.filters.urlrewrite.NormalRewrittenUrl.doRewrite(NormalRewrittenUrl.java:213)
 org.tuckey.web.filters.urlrewrite.RuleChain.handleRewrite(RuleChain.java:171)
 org.tuckey.web.filters.urlrewrite.RuleChain.doRules(RuleChain.java:145)
 org.tuckey.web.filters.urlrewrite.UrlRewriter.processRequest(UrlRewriter.java:92)
 org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:381)
 org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:390)

How to configure it, to not throw an exception and instead return to page and show error messages…

Answer 1

You should explicitly decide what to do with validation errors:

@RequestMapping(method = RequestMethod.POST, value = "new") 
public String save(@Valid Article article, BindingResult result, ModelMap model) { 
    if (result.hasErrors())
        return "formView";