JSR-303 validation doesn't work with nested properties in case of direct field access

package com.asseco.ce.valid;

import javax.validation.Valid;
import javax.validation.constraints.NotNull;

public class A {   
    @NotNull
    @Valid
    private B b;

    public B getB() {
        return b;
    }
    public void setB(B b) {
        this.b = b;
    }
}

package com.asseco.ce.valid;
import org.hibernate.validator.constraints.NotBlank;

public class B {
    @NotBlank
    private String value;

    public String getValue() {
        return value;
    }
    public void setValue(String value) {
        this.value = value;
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd">
  <bean id="validator" class="org.springframework.validation.beanvalidation.LocalValidatorFactoryBean"/>
 </beans>

package com.asseco.ce.valid;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import org.springframework.validation.DirectFieldBindingResult;
import org.springframework.validation.Errors;
import org.springframework.validation.Validator;

import com.asseco.ce.valid.A;
import com.asseco.ce.valid.B;

import static org.junit.Assert.*;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = { "ValidationIntegrationTest.xml" } )
public class ValidationIntegrationTest {

    @Autowired private Validator springValidator;
    @Autowired private javax.validation.Validator jsr303Validator;
    
    private A a;
    
    @Before
    public void before() {
        a = new A();
        a.setB(new B());
    }
    @Test
    public void jsr303() {
        assertEquals(1, jsr303Validator.validate(a).size());
    }   
    @Test
    public void spring() {
        Errors errors = new DirectFieldBindingResult(a, "A");
        springValidator.validate(a, errors);
        assertEquals(1, errors.getAllErrors().size());
    }
}

java.lang.IllegalStateException: JSR-303 validated property 'b.value' does not have a corresponding accessor for Spring data binding - check your DataBinder's configuration (bean property versus direct field access)
	at org.springframework.validation.beanvalidation.SpringValidatorAdapter.processConstraintViolations(SpringValidatorAdapter.java:152)
	at org.springframework.validation.beanvalidation.SpringValidatorAdapter.validate(SpringValidatorAdapter.java:89)
	at com.asseco.ce.valid.ValidationIntegrationTest.spring(ValidationIntegrationTest.java:42)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
	at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74)
	at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:83)
	at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:231)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:88)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
	at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
	at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:71)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:174)
	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: org.springframework.beans.NotReadablePropertyException: Invalid property 'b.value' of bean class [com.asseco.ce.valid.A]: Field 'b.value' does not exist
	at org.springframework.beans.DirectFieldAccessor.getPropertyValue(DirectFieldAccessor.java:106)
	at org.springframework.validation.AbstractPropertyBindingResult.getActualFieldValue(AbstractPropertyBindingResult.java:99)
	at org.springframework.validation.AbstractBindingResult.getRawFieldValue(AbstractBindingResult.java:275)
	at org.springframework.validation.beanvalidation.SpringValidatorAdapter.processConstraintViolations(SpringValidatorAdapter.java:137)
	... 31 more