org.hibernate.MappingException: property mapping has wrong number of columns: pl.kambu.customfields.data.Person.values type: component[foo,bar]
   at org.hibernate.mapping.PersistentClass.validate(PersistentClass.java:465)
   at org.hibernate.mapping.RootClass.validate(RootClass.java:236)
   at org.hibernate.cfg.Configuration.validate(Configuration.java:1193)
   at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1378)
   at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:954)
   at pl.kambu.customfields.AppTest.testApp(AppTest.java:62)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
   at java.lang.reflect.Method.invoke(Method.java:597)
   at junit.framework.TestCase.runTest(TestCase.java:168)
   at junit.framework.TestCase.runBare(TestCase.java:134)
   at junit.framework.TestResult$1.protect(TestResult.java:110)
   at junit.framework.TestResult.runProtected(TestResult.java:128)
   at junit.framework.TestResult.run(TestResult.java:113)
   at junit.framework.TestCase.run(TestCase.java:124)
   at junit.framework.TestSuite.runTest(TestSuite.java:232)
   at junit.framework.TestSuite.run(TestSuite.java:227)
   at org.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:83)
   at org.apache.maven.surefire.junit4.JUnit4TestSet.execute(JUnit4TestSet.java:62)
   at org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.executeTestSet(AbstractDirectoryTestSuite.java:140)
   at org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.execute(AbstractDirectoryTestSuite.java:127)
   at org.apache.maven.surefire.Surefire.run(Surefire.java:177)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
   at java.lang.reflect.Method.invoke(Method.java:597)
   at org.apache.maven.surefire.booter.SurefireBooter.runSuitesInProcess(SurefireBooter.java:345)
   at org.apache.maven.surefire.booter.SurefireBooter.main(SurefireBooter.java:1009)

<hibernate-mapping package="pl.kambu.customfields.data">

   <class name="Person">
      <id name="id">
         <generator class="identity" />
      </id>
      <property name="name" />


      <dynamic-component name="values">
         <property name="foo" column="FOO" type="string" />
         <property name="bar" column="BAR" type="integer" />
      </dynamic-component>
   </class>

</hibernate-mapping>

@Entity
public class Person {
   private Long id;
   private String name;
   private Map<String, Field> values = new HashMap<String, Field>();
   
   @Id
   @GeneratedValue(strategy = GenerationType.IDENTITY)
   public Long getId() {
      return id;
   }

   public void setId(Long id) {
      this.id = id;
   }

   public String getName() {
      return name;
   }

   public void setName(String name) {
      this.name = name;
   }

   @CollectionOfElements(targetElement=Field.class)
   @MapKeyClass(String.class)
   public Map<String, Field> getValues() {
      return values;
   }

   public void setValues(Map<String, Field> values) {
      this.values = values;
   }   
}

   private Property addDynamicAttribute(CustomField customField, PersistentClass persistentClass, Component dynamicComponent) {

      // Create a new db column specification.
      Column column = new Column();
      column.setName(customField.getName());
      column.setNullable(customField.isNullable());
      column.setUnique(customField.isUnique());

      int length = customField.getLength();
      if (length != CustomField.DEFAULT_DATABASE_LENGTH) {
         column.setLength(length);
      }

      // Add column to table also.
      //persistentClass.getTable().addColumn(column);
      

      // Create a simple value that contains the column and will be set to the
      // property as information.
      
      //Mappings mappings = dynamicComponent.getMappings();

      //mappings.addColumnBinding(customField.getName(), column, persistentClass.getTable());
      
   
      SimpleValue simpleValue = new SimpleValue(persistentClass.getTable());
      simpleValue.addColumn(column);
      simpleValue.setTypeName(customField.getTypeClass().getName());
      
      //simpleValue.setTable(persistentClass.getTable());
      
      // Create a new property.
      Property property = new Property();
      property.setName(customField.getName());
      property.setNodeName(customField.getName());
      property.setPropertyAccessorName(customField.getPropertyAccessorName());
      property.setCascade(customField.getCascade());
      
      property.setValue(simpleValue);

      
      return property;
   }

   public void update(Session session) {

      List<CustomField> customFields = getCustomFields(session);
      for (CustomField customField : customFields) {
         // The persistent dynamic attribute.
         PersistentClass persistentClass = configuration.getClassMapping(customField.getPersistentClass().getName());
         Property dynamicProperty = persistentClass.getProperty(customField.getPropertyName());

         // Get the dynamic component and
         Component dynamicComponent = (Component) dynamicProperty.getValue();

         // Add the new attribute if the component is a dynamic component.
         if (dynamicComponent.isDynamic()) {
            dynamicComponent.addProperty(addDynamicAttribute(customField, persistentClass, dynamicComponent));
            
            //addDynamicAttribute(customField, persistentClass, dynamicComponent);
            
         }

      }

      printMappings();
      new SchemaUpdate(configuration).execute(true, true);
      printMappings();
   }