diff --git a/impl/core/src/main/java/br/gov/frameworkdemoiselle/internal/bootstrap/TransactionBootstrap.java b/impl/core/src/main/java/br/gov/frameworkdemoiselle/internal/bootstrap/TransactionBootstrap.java
index 20ab1ba..1188722 100644
--- a/impl/core/src/main/java/br/gov/frameworkdemoiselle/internal/bootstrap/TransactionBootstrap.java
+++ b/impl/core/src/main/java/br/gov/frameworkdemoiselle/internal/bootstrap/TransactionBootstrap.java
@@ -40,24 +40,51 @@ import javax.enterprise.event.Observes;
 import javax.enterprise.inject.spi.ProcessAnnotatedType;
 
 import org.apache.commons.configuration.Configuration;
-import org.apache.commons.configuration.ConfigurationException;
 import org.apache.commons.configuration.PropertiesConfiguration;
 
+import br.gov.frameworkdemoiselle.configuration.ConfigurationException;
 import br.gov.frameworkdemoiselle.internal.implementation.DefaultTransaction;
 import br.gov.frameworkdemoiselle.transaction.Transaction;
 
 public class TransactionBootstrap extends AbstractBootstrap {
 
-	public <T> void processAnnotatedType(@Observes final ProcessAnnotatedType<T> event) throws ConfigurationException {
+	private static Class<Transaction> selected;
 
-		Configuration config = new PropertiesConfiguration("demoiselle.properties");
-		String selected = config.getString("frameworkdemoiselle.transaction.class",
-				DefaultTransaction.class.getCanonicalName());
+	public <T> void processAnnotatedType(@Observes final ProcessAnnotatedType<T> event) {
+		Class<?> annotated = event.getAnnotatedType().getJavaClass();
 
-		Class<?> type = event.getAnnotatedType().getJavaClass();
-		if (Transaction.class.isAssignableFrom(type) && type != Transaction.class
-				&& !type.getCanonicalName().equals(selected)) {
+		if (Transaction.class.isAssignableFrom(annotated) && annotated != Transaction.class
+				&& !annotated.equals(getSelected())) {
 			event.veto();
 		}
 	}
+
+	@SuppressWarnings("unchecked")
+	private synchronized static Class<Transaction> getSelected() {
+		if (selected == null) {
+			String canonicalName = null;
+
+			try {
+				Configuration config = new PropertiesConfiguration("demoiselle.properties");
+				canonicalName = config.getString("frameworkdemoiselle.transaction.class",
+						DefaultTransaction.class.getCanonicalName());
+
+				ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
+				selected = (Class<Transaction>) Class.forName(canonicalName, false, classLoader);
+				selected.asSubclass(Transaction.class);
+
+			} catch (org.apache.commons.configuration.ConfigurationException cause) {
+				throw new ConfigurationException(getBundle().getString("file-not-found", "demoiselle.properties"));
+
+			} catch (ClassNotFoundException cause) {
+				throw new ConfigurationException(getBundle().getString("transaction-class-not-found", canonicalName));
+
+			} catch (ClassCastException cause) {
+				throw new ConfigurationException(getBundle().getString("transaction-class-must-be-of-type",
+						canonicalName, Transaction.class.getCanonicalName()));
+			}
+		}
+
+		return selected;
+	}
 }
diff --git a/impl/core/src/main/resources/demoiselle-core-bundle.properties b/impl/core/src/main/resources/demoiselle-core-bundle.properties
index 17f5791..d94cd1a 100644
--- a/impl/core/src/main/resources/demoiselle-core-bundle.properties
+++ b/impl/core/src/main/resources/demoiselle-core-bundle.properties
@@ -58,7 +58,7 @@ configuration-attribute-is-mandatory=A configura\u00E7\u00E3o {0} \u00E9 obrigat
 configuration-name-attribute-cant-be-empty=A nota\u00E7\u00E3o Name n\u00E3o pode estar em branco
 configuration-key-not-found=Chave de configura\u00E7\u00E3o "{0}" n\u00E3o encontrada. Conven\u00E7\u00F5es verificadas\: "{1}"
 
-transaction-not-defined=Nenhuma transa\u00E7\u00E3o foi definida. Para utilizar @{0} \u00E9 preciso definir a estrat\u00E9gia de transa\u00E7\u00E3o desejada no arquivo beans.xml
+transaction-not-defined=Nenhuma transa\u00E7\u00E3o foi definida. Para utilizar @{0} \u00E9 preciso definir a propriedade "frameworkdemoiselle.transaction.class" com a estrat\u00E9gia de transa\u00E7\u00E3o desejada no arquivo demoiselle.properties
 executing-all=Executando todos os \: {0}
 custom-context-was-registered=O contexto {0} foi registrado
 custom-context-was-unregistered=O contexto {0} foi removido
@@ -70,8 +70,8 @@ error-creating-new-instance-for=Error creating a new instance for "{0}"
 executed-successfully=\ {0} execultado com sucesso
 must-declare-one-single-parameter=Voc\u00EA deve declarar um par\u00E2metro \u00FAnico em {0}
 loading-default-transaction-manager=Carregando o gerenciador de transa\u00E7\u00E3o padr\u00E3o {0}
-transaction-class-not-found=A classe de transa\u00E7\u00E3o "{0}" informada n\u00E3o foi encontrada.
-transaction-class-must-be-of-type=A classe de transa\u00E7\u00E3o "{0}" informada deve ser do tipo {1}
+transaction-class-not-found=A classe de transa\u00E7\u00E3o "{0}" informada no demoiselle.properties n\u00E3o foi encontrada no classpath.
+transaction-class-must-be-of-type=A classe de transa\u00E7\u00E3o "{0}" informada no demoiselle.properties deve ser do tipo "{1}"
 results-count-greater-page-size=Quantidade de resultados {0} \u00E9 maior que o tamanho da p\u00E1gina {1}
 page-result=Resultado paginado [p\u00E1gina\={0}, total de resultados\={1}]
 page=P\u00E1gina [n\u00FAmero\={0}, tamanho\={1}]
--
libgit2 0.21.2