Spring 3.1 minor issue with converter/formatter functionality

[srikondoji]

I have written and registered a formatter to format 'firstname lastname' string to Name object. This works fine, however my formatter is not called when i enter a empty string in the name field. So i tried adding @NotEmpty annotation and when i try the filling the form with empty name field,i get bombed out with following stack trace

org.springframework.web.util.NestedServletExceptio n: Request processing failed; nested exception is javax.validation.UnexpectedTypeException: No validator could be found for type: com.samridh.ebulawa.web.domain.account.Name
org.springframework.web.servlet.FrameworkServlet.p rocessRequest(FrameworkServlet.java:894)
org.springframework.web.servlet.FrameworkServlet.d oPost(FrameworkServlet.java:789)
javax.servlet.http.HttpServlet.service(HttpServlet .java:637)
javax.servlet.http.HttpServlet.service(HttpServlet .java:717)
org.springframework.web.filter.CharacterEncodingFi lter.doFilterInternal(CharacterEncodingFilter.java :88)
org.springframework.web.filter.OncePerRequestFilte r.doFilter(OncePerRequestFilter.java:76)
org.springframework.web.filter.HttpPutFormContentF ilter.doFilterInternal(HttpPutFormContentFilter.ja va:88)
org.springframework.web.filter.OncePerRequestFilte r.doFilter(OncePerRequestFilter.java:76)

root cause

javax.validation.UnexpectedTypeException: No validator could be found for type: com.samridh.ebulawa.web.domain.account.Name
org.hibernate.validator.engine.ConstraintTree.veri fyResolveWasUnique(ConstraintTree.java:244)
org.hibernate.validator.engine.ConstraintTree.find MatchingValidatorClass(ConstraintTree.java:227)
org.hibernate.validator.engine.ConstraintTree.getI nitializedValidator(ConstraintTree.java:179)
org.hibernate.validator.engine.ConstraintTree.vali dateConstraints(ConstraintTree.java:135)
org.hibernate.validator.metadata.MetaConstraint.va lidateConstraint(MetaConstraint.java:121)
org.hibernate.validator.engine.ValidatorImpl.valid ateConstraint(ValidatorImpl.java:327)
org.hibernate.validator.engine.ValidatorImpl.valid ateConstraintsForRedefinedDefaultGroup(ValidatorIm pl.java:273)
org.hibernate.validator.engine.ValidatorImpl.valid ateConstraintsForCurrentGroup(ValidatorImpl.java:2 56)
org.hibernate.validator.engine.ValidatorImpl.valid ateInContext(ValidatorImpl.java:210)
org.hibernate.validator.engine.ValidatorImpl.valid ate(ValidatorImpl.java:119)
org.springframework.validation.beanvalidation.Spri ngValidatorAdapter.validate(SpringValidatorAdapter .java:101)
org.springframework.validation.DataBinder.validate (DataBinder.java:722)
org.springframework.web.method.annotation.ModelAtt ributeMethodProcessor.validateIfApplicable(ModelAt tributeMethodProcessor.java:154)
org.springframework.web.method.annotation.ModelAtt ributeMethodProcessor.resolveArgument(ModelAttribu teMethodProcessor.java:107)
org.springframework.web.method.support.HandlerMeth odArgumentResolverComposite.resolveArgument(Handle rMethodArgumentResolverComposite.java:74)
org.springframework.web.method.support.InvocableHa ndlerMethod.getMethodArgumentValues(InvocableHandl erMethod.java:155)
org.springframework.web.method.support.InvocableHa ndlerMethod.invokeForRequest(InvocableHandlerMetho d.java:117)
org.springframework.web.servlet.mvc.method.annotat ion.ServletInvocableHandlerMethod.invokeAndHandle( ServletInvocableHandlerMethod.java:96)
org.springframework.web.servlet.mvc.method.annotat ion.RequestMappingHandlerAdapter.invokeHandlerMeth od(RequestMappingHandlerAdapter.java:617)
org.springframework.web.servlet.mvc.method.annotat ion.RequestMappingHandlerAdapter.handleInternal(Re questMappingHandlerAdapter.java:578)
org.springframework.web.servlet.mvc.method.Abstrac tHandlerMethodAdapter.handle(AbstractHandlerMethod Adapter.java:80)
org.springframework.web.servlet.DispatcherServlet. doDispatch(DispatcherServlet.java:900)
org.springframework.web.servlet.DispatcherServlet. doService(DispatcherServlet.java:827)
org.springframework.web.servlet.FrameworkServlet.p rocessRequest(FrameworkServlet.java:882)
org.springframework.web.servlet.FrameworkServlet.d oPost(FrameworkServlet.java:789)
javax.servlet.http.HttpServlet.service(HttpServlet .java:637)
javax.servlet.http.HttpServlet.service(HttpServlet .java:717)
org.springframework.web.filter.CharacterEncodingFi lter.doFilterInternal(CharacterEncodingFilter.java :88)
org.springframework.web.filter.OncePerRequestFilte r.doFilter(OncePerRequestFilter.java:76)
org.springframework.web.filter.HttpPutFormContentF ilter.doFilterInternal(HttpPutFormContentFilter.ja va:88)
org.springframework.web.filter.OncePerRequestFilte r.doFilter(OncePerRequestFilter.java:76)

case 1): The following syntax works, but my custome @NameFormat is not trigggered for empty string in the UI

public class SignupForm {

@NameFormat
private Name name;
-----
}

case 2): The following syntax bombs for empty string in the front end with the above exception.

public class SignupForm {

@NotEmpty
@NameFormat
private Name name;
-----
}

My Question is, how do i validate for empty string?

[srikondoji]

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