Spring extrange behaiuvour

I have the following XML configurarion file:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:util="http://www.springframework.org/schema/util"
       xmlns:p="http://www.springframework.org/schema/p"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
          http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
          http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.0.xsd">

then i have the following code on TesisDAOImpl class:

public class TesisDAOImpl
       extends SimpleJdbcDaoSupport
               implements TesisDAO {

public TesisDAOImpl(){
                super();
        System.out.println("Iniciando TesisDAO");

}

@Override
    public List<TesisTO> getIusPorPalabra(BusquedaTO parametros) {

//BooleanQuery.SetMaxClauseCount(IUSConstants.CLAUSULAS);
        SpanishAnalyzer analyzer = new SpanishAnalyzer(Version.LUCENE_31);
        List<String> querysEscritos = new ArrayList<String>();
        String queryEpocas = "";
        BooleanQuery QueryCompleto = new BooleanQuery();
        BooleanQuery queryGlobal = new BooleanQuery();
        IndexSearcher searcher = null;
        Directory dir = null;
        File Indexer = new File(IUSConstants.DIRECCION_INDEXER);
        try {
            dir = new SimpleFSDirectory(Indexer);
            System.out.println("Hola");
        } catch (Exception ex) {
            Logger.getLogger(TesisDAOImpl.class.getName()).log(Level.SEVERE, null, ex);
        }

while (searcher == null) {
            try {
               searcher = new IndexSearcher(dir);
            } catch (Exception exc) {
                String mensaje = "TesisDAOImpl Exception at getIusPorPalabraPaginador(BusquedaTO)\nProblemas con los archivos temporales:\n" 
                                   + exc.getMessage() + exc.getStackTrace();
                Logger.getLogger(TesisDAOImpl.class.getName()).log(Level.SEVERE, null, mensaje);
            }
        }
        
        if ((parametros.getOrdenarPor() == null) || (parametros.getOrdenarPor().equals(IUSConstants.ORDER_DEFAULT))) {
            parametros.setOrdenarPor( IUSConstants.ORDER_RUBRO);
        }
        
//        return null;
        String ordenarPor = parametros.getOrdenarPor() == null ? IUSConstants.ORDER_DEFAULT : parametros.getOrdenarPor();
        List<TesisTO> resultado = new ArrayList<TesisTO>();
        int[] partes = obtenPartes(parametros);
        String query = "";
        List<String> numeros = new ArrayList<String>();
        
        return null;
}

if i comment the line: dir = new SimpleFSDirectory(Indexer); everything works fine...
BUT when i compile that line Spring turns itself mad, can't load the TesisDAO singleton and the messages are:

4/05/2011 12:34:41 PM org.springframework.context.support.AbstractApplicationContext prepareRefresh
INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@1f99eea: startup date [Wed May 04 12:34:41 CDT 2011]; root of context hierarchy
4/05/2011 12:34:41 PM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from class path resource [Apendice2010/ApplicationContext.xml]
4/05/2011 12:34:42 PM org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons
INFO: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@1320a41: defining beans [dataSource,TomosDAO,TesisDAO]; root of factory hierarchy
Iniciando TomosDAO
4/05/2011 12:34:42 PM org.springframework.jdbc.datasource.DriverManagerDataSource setDriverClassName
INFO: Loaded JDBC driver: org.apache.derby.jdbc.EmbeddedDriver
4/05/2011 12:34:42 PM org.springframework.beans.factory.support.DefaultSingletonBeanRegistry destroySingletons
INFO: Destroying singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@1320a41: defining beans [dataSource,TomosDAO,TesisDAO]; root of factory hierarchy
BUILD SUCCESSFUL (total time: 10 seconds)

Does anyone has any clue??? any at all??? i am getting craizy around here
Greetings

I had to take that method off the DAO class, implement a new class with that method and call it from the DAO and worked... still stange to me...
Greetings