diff --git a/impl/core/src/main/java/br/gov/frameworkdemoiselle/internal/implementation/ConfigurationClassValueExtractor.java b/impl/core/src/main/java/br/gov/frameworkdemoiselle/internal/implementation/ConfigurationClassValueExtractor.java
index 8021376..8b41b25 100644
--- a/impl/core/src/main/java/br/gov/frameworkdemoiselle/internal/implementation/ConfigurationClassValueExtractor.java
+++ b/impl/core/src/main/java/br/gov/frameworkdemoiselle/internal/implementation/ConfigurationClassValueExtractor.java
@@ -55,7 +55,7 @@ public class ConfigurationClassValueExtractor implements ConfigurationValueExtra
 		Object value = null;
 		String canonicalName = configuration.getString(prefix + key);
 
-		if (canonicalName != null) {
+		if (!canonicalName.equals("")) {
 			try {
 				value = Reflections.forName(canonicalName);
 			} catch (ClassNotFoundException cause) {
diff --git a/impl/core/src/main/java/br/gov/frameworkdemoiselle/internal/implementation/ConfigurationStringValueExtractor.java b/impl/core/src/main/java/br/gov/frameworkdemoiselle/internal/implementation/ConfigurationStringValueExtractor.java
index 9eb146d..de21447 100644
--- a/impl/core/src/main/java/br/gov/frameworkdemoiselle/internal/implementation/ConfigurationStringValueExtractor.java
+++ b/impl/core/src/main/java/br/gov/frameworkdemoiselle/internal/implementation/ConfigurationStringValueExtractor.java
@@ -50,7 +50,13 @@ public class ConfigurationStringValueExtractor implements ConfigurationValueExtr
 
 	@Override
 	public Object getValue(String prefix, String key, Field field, Configuration configuration) {
-		return configuration.getString(prefix + key);
+		Object value = configuration.getString(prefix + key);
+
+		if ((value !=null) && (value.equals(""))) {
+			value = null;
+		}
+
+		return value;
 	}
 
 	@Override
--
libgit2 0.21.2