Problema Transação ibatis

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#1

Boa Tarde Pessoal,

Estou tendo problemas para iniciar um projeto simples utilizando o framework ibatis quando tento fazer a query, dá nullpointer no momento que chama o getTransaction, queryForObject(“insert”, usuario);

dá o seguinte erro:
java.lang.NullPointerException
at com.ibatis.dao.engine.impl.StandardDaoManager.getTransaction(StandardDaoManager.java:108)
at com.ibatis.dao.client.template.SqlMapDaoTemplate.getSqlMapExecutor(SqlMapDaoTemplate.java:60)
at com.ibatis.dao.client.template.SqlMapDaoTemplate.queryForObject(SqlMapDaoTemplate.java:162)
at dao.usuario.ibatis.UsuarioDAOIbatisImpl.insert(UsuarioDAOIbatisImpl.java:57)
at facade.usuario.impl.UsuarioIbatisImpl.insert(UsuarioIbatisImpl.java:60)
at main.PocIbatisMain.main(PocIbatisMain.java:28)

o meu dao.xml é o seguinte:

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE daoConfig
    PUBLIC "-//ibatis.apache.org//DTD DAO Configuration 2.0//EN"
    "http://ibatis.apache.org/dtd/dao-2.dtd">

<daoConfig>

  <context>

    <transactionManager type="SQLMAP">
      <property name="SqlMapConfigResource"
        value="dao/sql-map-config.xml"/>
    </transactionManager>

    <dao interface="dao.usuario.UsuarioDAO"
      implementation="dao.usuario.ibatis.UsuarioDAOIbatisImpl"/>

  </context>

</daoConfig>

este é o meu sql-map-config.xml:

        <?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE sqlMapConfig PUBLIC "-//ibatis.apache.org//DTD SQL Map Config 2.0//EN"
    "http://ibatis.apache.org/dtd/sql-map-config-2.dtd">

<sqlMapConfig>

   <properties resource="properties/database.properties"/>
   <settings cacheModelsEnabled="true" enhancementEnabled="true" lazyLoadingEnabled="true" errorTracingEnabled="false" maxRequests="32"   maxSessions="10"    maxTransactions="5"    useStatementNamespaces="false" />

  <transactionManager type="JDBC">
    <dataSource type="SIMPLE">
      <property value="${driver}" name="JDBC.Driver"/>
      <property value="${url}" name="JDBC.ConnectionURL"/>
      <property value="${username}" name="JDBC.Username"/>
      <property value="${password}" name="JDBC.Password"/>
    </dataSource>
  </transactionManager>

  <sqlMap resource="dao/usuario/ibatis/Usuario.xml"/>
  
</sqlMapConfig>

este é o meu DaoConfig:

public class DaoConfig {

	private static final String resource = "dao/dao.xml";
	private static final DaoManager daoManager;

	static {
		try {
			daoManager = newDaoManager(null);
			Properties props = Resources.getResourceAsProperties("properties/database.properties");
			String url = props.getProperty("url");
			String driver = props.getProperty("driver");
			String username = props.getProperty("username");
			String password = props.getProperty("password");
			if (url.equals("jdbc:mysql://localhost/Poc1")) {
				Class.forName(driver).newInstance();
				Connection conn = DriverManager.getConnection(url, username, password);
				conn.close();
			}
		} catch (Exception e) {
			throw new RuntimeException("Description.  Cause: " + e, e);
		}

	}

	public static DaoManager getDaoManager() {
		return daoManager;
	}

	public static DaoManager newDaoManager(Properties props) {
		try {
			Reader reader = Resources.getResourceAsReader(resource);
			return DaoManagerBuilder.buildDaoManager(reader, props);
		} catch (Exception e) {
			throw new RuntimeException(
					"Could not initialize DaoConfig.  Cause: " + e, e);
		}
	}
}

este é o Usuario.xml:

<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE sqlMap PUBLIC "-//ibatis.apache.org//DTD SQL Map 2.0//EN"
    "http://ibatis.apache.org/dtd/sql-map-2.dtd">

<sqlMap namespace="Usuario">

	<typeAlias alias="usuario" type="modelo.usuario.Usuario" />

	<insert id="insert" parameterClass="usuario">
		INSERT INTO USUARIO (NOME, SOBRENOME, LOGIN, SENHA)
		VALUES (#nome#, #sobrenome#, #login#, #senha#)
	</insert>

</sqlMap>

e a classe que implementa o meu dao:

public class UsuarioDAOIbatisImpl extends SqlMapDaoTemplate implements UsuarioDAO {

	public UsuarioDAOIbatisImpl(DaoManager daoManager) {
		super(daoManager);
	}
@Override
	public void insert(Usuario usuario) {
		try {
			daoManager.startTransaction();
			queryForObject("insert", usuario);
			daoManager.commitTransaction();
		} catch (Exception e) {
			System.err.println("ERRO:" + e.getMessage());
			e.printStackTrace();
		} finally {
			daoManager.endTransaction();
		}
	}
}

será que alguem poderia me ajudar? desde já obrigado pessoal.

#2