diff --git a/.classpath b/.classpath
index 79118bb..94f2fe7 100644
--- a/.classpath
+++ b/.classpath
@@ -7,7 +7,7 @@
 		</attributes>
 	</classpathentry>
 	<classpathentry kind="src" path="src"/>
-	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-14">
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER">
 		<attributes>
 			<attribute name="module" value="true"/>
 		</attributes>
diff --git a/src/org/atriasoft/exml/builder/IntrospectionData.java b/src/org/atriasoft/exml/builder/IntrospectionData.java
index c16e063..184174e 100644
--- a/src/org/atriasoft/exml/builder/IntrospectionData.java
+++ b/src/org/atriasoft/exml/builder/IntrospectionData.java
@@ -186,248 +186,264 @@ public class IntrospectionData {
 	public Class<?> getSubClassType() {
 		return this.subClassType;
 	}
-	public IntrospectionData(final Class<?> classType) throws Exception {
+	public IntrospectionData(final Class<?> classType) throws ExmlBuilderException {
 		this(classType, null);
 	}
-	public IntrospectionData(final Class<?> classType, final Class<?> subClassType) throws Exception {
-		this.classType = classType;
-		this.subClassType = subClassType;
-		final Boolean isDefaultManaged = getIsDefaultManaged(classType, IntrospectionData.DEFAULT_MANAGED);
-		final Boolean isDefaultOptional = getIsDefaultOptional(classType, IntrospectionData.DEFAULT_OPTIONAL);
-		final Boolean isDefaultCaseSensitive = getIsDefaultCaseSensitive(classType, IntrospectionData.DEFAULT_CASE_SENSITIVE);
-		Log.verbose("Introspect class: '" + classType.getCanonicalName() + "'");
-		final Constructor<?>[] constructors = this.classType.getConstructors();
-		Log.verbose("    Constructors: (" + constructors.length + ")");
-		for (final Constructor<?> elem : constructors) {
-			Log.verbose("        - " + elem.toGenericString());
-		}
-		final Field[] fields = this.classType.getFields();
-		Log.verbose("    Fields: (" + fields.length + ")");
-		for (final Field elem : fields) {
-			final Boolean isManaged = getIsManaged(elem, isDefaultManaged);
-			final Boolean isOptionnal = getIsOptional(elem, isDefaultOptional);
-			final String[] names = getNames(elem, Tools.decapitalizeFirst(elem.getName()));
-			final Boolean caseSensitive = getIsCaseSensitive(elem, isDefaultCaseSensitive);
-			final String listName = getListName(elem, null);
-			// TODO check if property does not already exist ...
-			if (isManaged) {
-				this.properties.add(new IntrospectionPropertyField(elem, names, listName, caseSensitive, isOptionnal));
+	public IntrospectionData(final Class<?> classType, final Class<?> subClassType) throws ExmlBuilderException {
+		try {
+			this.classType = classType;
+			this.subClassType = subClassType;
+			final Boolean isDefaultManaged = getIsDefaultManaged(classType, IntrospectionData.DEFAULT_MANAGED);
+			final Boolean isDefaultOptional = getIsDefaultOptional(classType, IntrospectionData.DEFAULT_OPTIONAL);
+			final Boolean isDefaultCaseSensitive = getIsDefaultCaseSensitive(classType, IntrospectionData.DEFAULT_CASE_SENSITIVE);
+			Log.verbose("Introspect class: '" + classType.getCanonicalName() + "'");
+			final Constructor<?>[] constructors = this.classType.getConstructors();
+			Log.verbose("    Constructors: (" + constructors.length + ")");
+			for (final Constructor<?> elem : constructors) {
+				Log.verbose("        - " + elem.toGenericString());
 			}
-			Log.verbose("        - " + elem.toGenericString());
-		}
-		final Method[] methodsTmp = this.classType.getMethods();
-		// filter getX setX isX
-		final List<Method> methods = List.of(methodsTmp).stream().filter(o -> {
-			if (o.getName().contentEquals("getClass")) {
-				return false;
+			final Field[] fields = this.classType.getFields();
+			Log.verbose("    Fields: (" + fields.length + ")");
+			for (final Field elem : fields) {
+				// we does not manage static field
+				if (Modifier.isStatic(elem.getModifiers())) {
+					continue;
+				}
+				// we does not manage private field
+				if (!Modifier.isPublic(elem.getModifiers())) {
+					continue;
+				}
+				final Boolean isManaged = getIsManaged(elem, isDefaultManaged);
+				final Boolean isOptionnal = getIsOptional(elem, isDefaultOptional);
+				final String[] names = getNames(elem, Tools.decapitalizeFirst(elem.getName()));
+				final Boolean caseSensitive = getIsCaseSensitive(elem, isDefaultCaseSensitive);
+				final String listName = getListName(elem, null);
+				// TODO check if property does not already exist ...
+				if (isManaged) {
+					this.properties.add(new IntrospectionPropertyField(elem, names, listName, caseSensitive, isOptionnal));
+				}
+				Log.verbose("        - " + elem.toGenericString());
 			}
-			if (Modifier.isStatic(o.getModifiers())) {
-				if (o.getName().contentEquals("valueOf") && o.getParameterCount() == 1 && o.getParameters()[0].getType() == String.class) {
-					return true;
+			final Method[] methodsTmp = this.classType.getMethods();
+			// filter getX setX isX
+			final List<Method> methods = List.of(methodsTmp).stream().filter(o -> {
+				if (o.getName().contentEquals("getClass")) {
+					return false;
+				}
+				// we does not manage private function
+				if (!Modifier.isPublic(o.getModifiers())) {
+					return false;
+				}
+				if (Modifier.isStatic(o.getModifiers())) {
+					if (o.getName().contentEquals("valueOf") && o.getParameterCount() == 1 && o.getParameters()[0].getType() == String.class) {
+						return true;
+					}
+					return false;
+				}
+				if (o.getName().startsWith("get")) {
+					if (o.getParameterCount() != 0 || o.getReturnType() == void.class || o.getReturnType() == Boolean.class || o.getReturnType() == boolean.class) {
+						return false;
+					}
+					// check name format
+					if (o.getName().length() == 3) {
+						return false;
+					}
+					if (o.getName().charAt(3) >= 'A' && o.getName().charAt(3) <= 'Z') {
+						return true;
+					}
+					return false;
+				}
+				if (o.getName().startsWith("set")) {
+					if (o.getReturnType() != void.class || o.getParameterCount() != 1) {
+						return false;
+					}
+					// check name format
+					if (o.getName().length() == 3) {
+						return false;
+					}
+					if (o.getName().charAt(3) >= 'A' && o.getName().charAt(3) <= 'Z') {
+						return true;
+					}
+					
+					return false;
+				}
+				if (o.getName().startsWith("is")) {
+					if (!(o.getReturnType() == Boolean.class || o.getReturnType() == boolean.class) && o.getParameterCount() != 0) {
+						return false;
+					}
+					// check name format
+					if (o.getName().length() == 2) {
+						return false;
+					}
+					if (o.getName().charAt(2) >= 'A' && o.getName().charAt(2) <= 'Z') {
+						return true;
+					}
+					
+					return false;
 				}
 				return false;
+			}).collect(Collectors.toList());
+			Log.verbose("    Methods: (" + methods.size() + ")");
+			for (final Method elem : methods) {
+				Log.verbose("        - " + elem.toGenericString());
 			}
-			if (o.getName().startsWith("get")) {
-				if (o.getParameterCount() != 0 || o.getReturnType() == void.class || o.getReturnType() == Boolean.class || o.getReturnType() == boolean.class) {
-					return false;
-				}
-				// check name format
-				if (o.getName().length() == 3) {
-					return false;
-				}
-				if (o.getName().charAt(3) >= 'A' && o.getName().charAt(3) <= 'Z') {
-					return true;
-				}
-				return false;
-			}
-			if (o.getName().startsWith("set")) {
-				if (o.getReturnType() != void.class || o.getParameterCount() != 1) {
-					return false;
-				}
-				// check name format
-				if (o.getName().length() == 3) {
-					return false;
-				}
-				if (o.getName().charAt(3) >= 'A' && o.getName().charAt(3) <= 'Z') {
-					return true;
-				}
-				
-				return false;
-			}
-			if (o.getName().startsWith("is")) {
-				if (!(o.getReturnType() == Boolean.class || o.getReturnType() == boolean.class) && o.getParameterCount() != 0) {
-					return false;
-				}
-				// check name format
-				if (o.getName().length() == 2) {
-					return false;
-				}
-				if (o.getName().charAt(2) >= 'A' && o.getName().charAt(2) <= 'Z') {
-					return true;
-				}
-				
-				return false;
-			}
-			return false;
-		}).collect(Collectors.toList());
-		Log.verbose("    Methods: (" + methods.size() + ")");
-		for (final Method elem : methods) {
-			Log.verbose("        - " + elem.toGenericString());
-		}
-		
-		
-		// Separate the methods and filer as:
-		// XXX GetXxx(); & XXX != boolean 
-		// void setXxx(XXX elem);
-		// [bB]oolean isXxx();
-		
-		List<Method> methodsGet;
-		List<Method> methodsSet;
-		List<Method> methodsIs;
-		if (!Enum.class.isAssignableFrom(classType)) {
-			methodsGet = methods.stream().filter(o -> o.getName().startsWith("get")).collect(Collectors.toList());
-			methodsSet = methods.stream().filter(o -> o.getName().startsWith("set")).collect(Collectors.toList());
-			methodsIs = methods.stream().filter(o -> o.getName().startsWith("is")).collect(Collectors.toList());
-		} else {
-			methodsGet = new ArrayList<>();
-			methodsSet = new ArrayList<>();
-			methodsIs = new ArrayList<>();
-		}
-		final List<Method> valueOfString = methods.stream().filter(o -> o.getName().startsWith("valueOf")).collect(Collectors.toList());
-		if (valueOfString.size() == 1) {
-			this.valueof = valueOfString.get(0);
-		} else {
-			// some specific model:
 			
-			this.valueof = null;
-		}
-		// associate methods by pair.
-		final List<OrderData> elements = new ArrayList<>();
-		for (final Method method : methodsGet) {
-			final String name = method.getName().substring(3);
-			final OrderData tmp = new OrderData(name);
-			tmp.getter = method;
-			elements.add(tmp);
-		}
-		for (final Method method : methodsIs) {
-			final String name = method.getName().substring(2);
-			for (final OrderData elem : elements) {
-				if (elem.name.contentEquals(name)) {
-					Log.error("Can not have a setXXX and isXXX with the same name ... " + method.getName());
-					throw new Exception("lmkjlkjlk");
-				}
+			
+			// Separate the methods and filer as:
+			// XXX GetXxx(); & XXX != boolean 
+			// void setXxx(XXX elem);
+			// [bB]oolean isXxx();
+			
+			List<Method> methodsGet;
+			List<Method> methodsSet;
+			List<Method> methodsIs;
+			if (!Enum.class.isAssignableFrom(classType)) {
+				methodsGet = methods.stream().filter(o -> o.getName().startsWith("get")).collect(Collectors.toList());
+				methodsSet = methods.stream().filter(o -> o.getName().startsWith("set")).collect(Collectors.toList());
+				methodsIs = methods.stream().filter(o -> o.getName().startsWith("is")).collect(Collectors.toList());
+			} else {
+				methodsGet = new ArrayList<>();
+				methodsSet = new ArrayList<>();
+				methodsIs = new ArrayList<>();
 			}
-			final OrderData tmp = new OrderData(name);
-			tmp.getter = method;
-			elements.add(tmp);
-		}
-		for (final Method method : methodsSet) {
-			final String name = method.getName().substring(3);
-			OrderData tmp = null;
-			for (final OrderData elem : elements) {
-				if (elem.name.contentEquals(name)) {
-					tmp = elem;
-					break;
-				}
+			final List<Method> valueOfString = methods.stream().filter(o -> o.getName().startsWith("valueOf")).collect(Collectors.toList());
+			if (valueOfString.size() == 1) {
+				this.valueof = valueOfString.get(0);
+			} else {
+				// some specific model:
+				
+				this.valueof = null;
 			}
-			/*
-			Class<?> internalModelClass = null;
-			Class<?>[] tmppp = method.getParameterTypes();
-			if (tmppp.length > 0 && (List.class.isAssignableFrom(tmppp[0]))) {
-				Log.warning("          * " + method.getName());
-				Type[] empppe = method.getGenericParameterTypes();
-				if (empppe.length > 0) {
-					if (empppe[0] instanceof ParameterizedType plopppppp) {
-						Type[] realType = plopppppp.getActualTypeArguments();
-						if (realType.length > 0) {
-							Log.warning("              -->> " + realType[0]);
-							internalModelClass = Class.forName(realType[0].getTypeName());
-						}
+			// associate methods by pair.
+			final List<OrderData> elements = new ArrayList<>();
+			for (final Method method : methodsGet) {
+				final String name = method.getName().substring(3);
+				final OrderData tmp = new OrderData(name);
+				tmp.getter = method;
+				elements.add(tmp);
+			}
+			for (final Method method : methodsIs) {
+				final String name = method.getName().substring(2);
+				for (final OrderData elem : elements) {
+					if (elem.name.contentEquals(name)) {
+						Log.error("Can not have a setXXX and isXXX with the same name ... " + method.getName());
+						throw new Exception("lmkjlkjlk");
 					}
 				}
-				for (int iii=0; iii<tmppp.length; iii++) {
-					Log.warning("              -- " + tmppp[iii].getCanonicalName());
-				}
-			}
-			*/
-			if (tmp == null) {
-				tmp = new OrderData(name);
-				tmp.setter = method;
+				final OrderData tmp = new OrderData(name);
+				tmp.getter = method;
 				elements.add(tmp);
-			} else {
-				tmp.setter = method;
 			}
-		}
-		// Add it in the engine
-		for (final OrderData elem : elements) {
-			Log.info("find methode : '" + elem.name + "' :");
-			if (elem.setter != null && elem.getter != null) {
-				Log.info("    setter: " + elem.setter.toGenericString());
-				Log.info("    getter: " + elem.getter.toGenericString());
-				final Boolean isManagedSet = getIsManaged(elem.setter, null);
-				final Boolean isManagedGet = getIsManaged(elem.getter, null);
-				if (isManagedSet != null && isManagedGet != null && isManagedSet != isManagedGet) {
-					throw new Exception("Can net set oposite information on getter and setter");
+			for (final Method method : methodsSet) {
+				final String name = method.getName().substring(3);
+				OrderData tmp = null;
+				for (final OrderData elem : elements) {
+					if (elem.name.contentEquals(name)) {
+						tmp = elem;
+						break;
+					}
 				}
-				final Boolean isManaged = isManagedSet != null ? isManagedSet : isManagedGet != null ? isManagedGet : isDefaultManaged;
-				
-				final Boolean isOptionnalSet = getIsOptional(elem.setter, null);
-				final Boolean isOptionnalGet = getIsOptional(elem.getter, null);
-				if (isOptionnalSet != null && isOptionnalGet != null && isOptionnalSet != isOptionnalGet) {
-					throw new Exception("Can net set oposite information on getter and setter");
+				/*
+				Class<?> internalModelClass = null;
+				Class<?>[] tmppp = method.getParameterTypes();
+				if (tmppp.length > 0 && (List.class.isAssignableFrom(tmppp[0]))) {
+					Log.warning("          * " + method.getName());
+					Type[] empppe = method.getGenericParameterTypes();
+					if (empppe.length > 0) {
+						if (empppe[0] instanceof ParameterizedType plopppppp) {
+							Type[] realType = plopppppp.getActualTypeArguments();
+							if (realType.length > 0) {
+								Log.warning("              -->> " + realType[0]);
+								internalModelClass = Class.forName(realType[0].getTypeName());
+							}
+						}
+					}
+					for (int iii=0; iii<tmppp.length; iii++) {
+						Log.warning("              -- " + tmppp[iii].getCanonicalName());
+					}
 				}
-				final Boolean isOptional = isOptionnalSet != null ? isOptionnalSet : isOptionnalGet != null ? isOptionnalGet : isDefaultOptional;
-				
-				final Boolean caseSensitiveSet = getIsCaseSensitive(elem.setter, null);
-				final Boolean caseSensitiveGet = getIsCaseSensitive(elem.getter, null);
-				if (caseSensitiveSet != null && caseSensitiveGet != null && caseSensitiveSet != caseSensitiveGet) {
-					throw new Exception("Can net set oposite information on getter and setter");
+				*/
+				if (tmp == null) {
+					tmp = new OrderData(name);
+					tmp.setter = method;
+					elements.add(tmp);
+				} else {
+					tmp.setter = method;
 				}
-				
-				final Boolean isCaseSensitive = caseSensitiveSet != null ? caseSensitiveSet : caseSensitiveGet != null ? caseSensitiveGet : isDefaultCaseSensitive;
-				
-				final String[] namesSet = getNames(elem.setter, null);
-				final String[] namesGet = getNames(elem.getter, null);
-				if (namesSet != null && namesGet != null && namesSet.equals(namesGet)) {
-					throw new Exception("Can net set oposite information on getter and setter");
-				}
-				final String[] names = namesSet != null ? namesSet : namesGet != null ? namesGet : new String[] { Tools.decapitalizeFirst(elem.name) };
-				final String listNameSet = getListName(elem.setter, null);
-				final String listNameGet = getListName(elem.getter, null);
-				final String listName = listNameSet != null? listNameSet: listNameGet;
-				this.methods.add(new IntrospectionPropertyMethod(elem.setter, elem.getter, names, listName, isCaseSensitive, isOptional));
-			} else {
-				Boolean isManaged = null;
-				Boolean isOptionnal = null;
-				String[] names = null;
-				Boolean isCaseSensitive = null;
-				String listName = null; 
-				if (elem.setter != null) {
+			}
+			// Add it in the engine
+			for (final OrderData elem : elements) {
+				Log.info("find methode : '" + elem.name + "' :");
+				if (elem.setter != null && elem.getter != null) {
 					Log.info("    setter: " + elem.setter.toGenericString());
-					isManaged = getIsManaged(elem.setter, isDefaultManaged);
-					isOptionnal = getIsOptional(elem.setter, isDefaultOptional);
-					names = getNames(elem.setter, Tools.decapitalizeFirst(elem.name));
-					isCaseSensitive = getIsCaseSensitive(elem.setter, isDefaultCaseSensitive);
-					listName= getListName(elem.setter, null);
-				} else {
-					Log.info("    setter: null");
-				}
-				if (elem.getter != null) {
 					Log.info("    getter: " + elem.getter.toGenericString());
-					isManaged = getIsManaged(elem.getter, isDefaultManaged);
-					isOptionnal = getIsOptional(elem.getter, isDefaultOptional);
-					names = getNames(elem.getter, Tools.decapitalizeFirst(elem.name));
-					isCaseSensitive = getIsCaseSensitive(elem.getter, isDefaultCaseSensitive);
-					listName= getListName(elem.getter, null);
+					final Boolean isManagedSet = getIsManaged(elem.setter, null);
+					final Boolean isManagedGet = getIsManaged(elem.getter, null);
+					if (isManagedSet != null && isManagedGet != null && isManagedSet != isManagedGet) {
+						throw new Exception("Can net set oposite information on getter and setter");
+					}
+					final Boolean isManaged = isManagedSet != null ? isManagedSet : isManagedGet != null ? isManagedGet : isDefaultManaged;
+					
+					final Boolean isOptionnalSet = getIsOptional(elem.setter, null);
+					final Boolean isOptionnalGet = getIsOptional(elem.getter, null);
+					if (isOptionnalSet != null && isOptionnalGet != null && isOptionnalSet != isOptionnalGet) {
+						throw new Exception("Can net set oposite information on getter and setter");
+					}
+					final Boolean isOptional = isOptionnalSet != null ? isOptionnalSet : isOptionnalGet != null ? isOptionnalGet : isDefaultOptional;
+					
+					final Boolean caseSensitiveSet = getIsCaseSensitive(elem.setter, null);
+					final Boolean caseSensitiveGet = getIsCaseSensitive(elem.getter, null);
+					if (caseSensitiveSet != null && caseSensitiveGet != null && caseSensitiveSet != caseSensitiveGet) {
+						throw new Exception("Can net set oposite information on getter and setter");
+					}
+					
+					final Boolean isCaseSensitive = caseSensitiveSet != null ? caseSensitiveSet : caseSensitiveGet != null ? caseSensitiveGet : isDefaultCaseSensitive;
+					
+					final String[] namesSet = getNames(elem.setter, null);
+					final String[] namesGet = getNames(elem.getter, null);
+					if (namesSet != null && namesGet != null && namesSet.equals(namesGet)) {
+						throw new Exception("Can net set oposite information on getter and setter");
+					}
+					final String[] names = namesSet != null ? namesSet : namesGet != null ? namesGet : new String[] { Tools.decapitalizeFirst(elem.name) };
+					final String listNameSet = getListName(elem.setter, null);
+					final String listNameGet = getListName(elem.getter, null);
+					final String listName = listNameSet != null? listNameSet: listNameGet;
+					this.methods.add(new IntrospectionPropertyMethod(elem.setter, elem.getter, names, listName, isCaseSensitive, isOptional));
 				} else {
-					Log.info("    getter: null");
-				}
-				if (isManaged) {
-					this.methods.add(new IntrospectionPropertyMethod(elem.setter, elem.getter, names, listName, isCaseSensitive, isOptionnal));
+					Boolean isManaged = null;
+					Boolean isOptionnal = null;
+					String[] names = null;
+					Boolean isCaseSensitive = null;
+					String listName = null; 
+					if (elem.setter != null) {
+						Log.info("    setter: " + elem.setter.toGenericString());
+						isManaged = getIsManaged(elem.setter, isDefaultManaged);
+						isOptionnal = getIsOptional(elem.setter, isDefaultOptional);
+						names = getNames(elem.setter, Tools.decapitalizeFirst(elem.name));
+						isCaseSensitive = getIsCaseSensitive(elem.setter, isDefaultCaseSensitive);
+						listName= getListName(elem.setter, null);
+					} else {
+						Log.info("    setter: null");
+					}
+					if (elem.getter != null) {
+						Log.info("    getter: " + elem.getter.toGenericString());
+						isManaged = getIsManaged(elem.getter, isDefaultManaged);
+						isOptionnal = getIsOptional(elem.getter, isDefaultOptional);
+						names = getNames(elem.getter, Tools.decapitalizeFirst(elem.name));
+						isCaseSensitive = getIsCaseSensitive(elem.getter, isDefaultCaseSensitive);
+						listName= getListName(elem.getter, null);
+					} else {
+						Log.info("    getter: null");
+					}
+					if (isManaged) {
+						this.methods.add(new IntrospectionPropertyMethod(elem.setter, elem.getter, names, listName, isCaseSensitive, isOptionnal));
+					}
 				}
 			}
+		} catch (Exception ex) {
+			ex.printStackTrace();
+			throw new ExmlBuilderException("Error in creating introspection data ... " + ex.getMessage());
 		}
-		
 	}
 	
 	Object createObject(final Map<String, Object> properties, final Map<String, List<Object>> nodes) throws ExmlBuilderException {
diff --git a/src/org/atriasoft/exml/builder/IntrospectionProperty.java b/src/org/atriasoft/exml/builder/IntrospectionProperty.java
index d546f9e..3b0a7a6 100644
--- a/src/org/atriasoft/exml/builder/IntrospectionProperty.java
+++ b/src/org/atriasoft/exml/builder/IntrospectionProperty.java
@@ -1,6 +1,7 @@
 package org.atriasoft.exml.builder;
 
 import org.atriasoft.exml.exception.ExmlBuilderException;
+import org.atriasoft.exml.parser.Tools;
 
 public abstract class IntrospectionProperty {
 	protected final Boolean caseSensitive;
@@ -40,8 +41,68 @@ public abstract class IntrospectionProperty {
 	public Class<?> getSubType() {
 		return this.subType;
 	}
-	
-	public abstract String getValue(Object object) throws ExmlBuilderException;
+
+	public String getValueString(final Object object) throws ExmlBuilderException {
+		Object value = getValue(object);
+		if (value == null) {
+			return null;
+		}
+		if (this.type == byte.class) {
+			return Byte.toString((byte)value);
+		}
+		if (this.type == short.class) {
+			return Short.toString((short)value);
+		}
+		if (this.type == int.class) {
+			return Integer.toString((int)value);
+		}
+		if (this.type == long.class) {
+			return Long.toString((long)value);
+		}
+		if (this.type == boolean.class) {
+			return Boolean.toString((boolean)value);
+		}
+		if (this.type == String.class) {
+			return (String)value;
+		}
+		if (this.type == Byte.class) {
+			return Byte.toString((Byte)value);
+		}
+		if (this.type == Short.class) {
+			return Short.toString((short)value);
+		}
+		if (this.type == Integer.class) {
+			return Integer.toString((Integer)value);
+		} else if (this.type == Long.class) {
+			return Long.toString((Long)value);
+		} else if (this.type == Boolean.class) {
+			return Boolean.toString((Boolean)value);
+		} else if (this.type == byte[].class) {
+			return Tools.toString((byte[])value);
+		} else if (this.type == Byte[].class) {
+			return Tools.toString((Byte[])value);
+		} else if (this.type == short[].class) {
+			return Tools.toString((short[])value);
+		} else if (this.type == Short[].class) {
+			return Tools.toString((Short[])value);
+		} else if (this.type == int[].class) {
+			return Tools.toString((int[])value);
+		} else if (this.type == Integer[].class) {
+			return Tools.toString((Integer[])value);
+		} else if (this.type == long[].class) {
+			return Tools.toString((long[])value);
+		} else if (this.type == Long[].class) {
+			return Tools.toString((Long[])value);
+		} else if (this.type == boolean[].class) {
+			return Tools.toString((boolean[])value);
+		} else if (this.type == Boolean[].class) {
+			return Tools.toString((Boolean[])value);
+		} else {
+			//throw new ExmlBuilderException("Can not parse the specific element ... need to introspect and find the 'xxx valueOf(String data);'");
+		}
+		return value.toString();
+	}
+	public abstract Object getValue(Object object) throws ExmlBuilderException;
 	
 	public boolean isCaseSensitive() {
 		return this.caseSensitive;
diff --git a/src/org/atriasoft/exml/builder/IntrospectionPropertyField.java b/src/org/atriasoft/exml/builder/IntrospectionPropertyField.java
index dd7d3be..56d6879 100644
--- a/src/org/atriasoft/exml/builder/IntrospectionPropertyField.java
+++ b/src/org/atriasoft/exml/builder/IntrospectionPropertyField.java
@@ -43,66 +43,10 @@ public class IntrospectionPropertyField extends IntrospectionProperty {
 	public boolean canSetValue() {
 		return true;
 	}
-	
 	@Override
-	public String getValue(final Object object) throws ExmlBuilderException {
+	public Object getValue(final Object object) throws ExmlBuilderException {
 		try {
-			Object value = this.fieldDescription.get(object);
-
-			if (this.type == byte.class) {
-				return Byte.toString((byte)value);
-			}
-			if (this.type == short.class) {
-				return Short.toString((short)value);
-			}
-			if (this.type == int.class) {
-				return Integer.toString((int)value);
-			}
-			if (this.type == long.class) {
-				return Long.toString((long)value);
-			}
-			if (this.type == boolean.class) {
-				return Boolean.toString((boolean)value);
-			}
-			if (this.type == String.class) {
-				return (String)value;
-			}
-			if (this.type == Byte.class) {
-				return Byte.toString((Byte)value);
-			}
-			if (this.type == Short.class) {
-				return Short.toString((short)value);
-			}
-			if (this.type == Integer.class) {
-				return Integer.toString((Integer)value);
-			} else if (this.type == Long.class) {
-				return Long.toString((Long)value);
-			} else if (this.type == Boolean.class) {
-				return Boolean.toString((Boolean)value);
-			} /* else if (this.type == byte[].class) {
-				return Tools.parseByteStringList(value);
-			} else if (this.type == Byte[].class) {
-				return Tools.parseByteClassStringList(value);
-			} else if (this.type == short[].class) {
-				return Tools.parseShortStringList(value);
-			} else if (this.type == Short[].class) {
-				return Tools.parseShortClassStringList(value);
-			} else if (this.type == int[].class) {
-				return Tools.parseIntegerStringList(value);
-			} else if (this.type == Integer[].class) {
-				return Tools.parseIntegerClassStringList(value);
-			} else if (this.type == long[].class) {
-				return Tools.parseLongStringList(value);
-			} else if (this.type == Long[].class) {
-				return Tools.parseLongClassStringList(value);
-			} else if (this.type == boolean[].class) {
-				return Tools.parseBooleanStringList(value);
-			} else if (this.type == Boolean[].class) {
-				return Tools.parseBooleanClassStringList(value);
-			} */else {
-				//throw new ExmlBuilderException("Can not parse the specific element ... need to introspect and find the 'xxx valueOf(String data);'");
-			}
-			return value.toString();
+			return this.fieldDescription.get(object);
 		} catch (IllegalArgumentException | IllegalAccessException e) {
 			// TODO Auto-generated catch block
 			e.printStackTrace();
diff --git a/src/org/atriasoft/exml/builder/IntrospectionPropertyMethod.java b/src/org/atriasoft/exml/builder/IntrospectionPropertyMethod.java
index b8dbb75..df10cec 100644
--- a/src/org/atriasoft/exml/builder/IntrospectionPropertyMethod.java
+++ b/src/org/atriasoft/exml/builder/IntrospectionPropertyMethod.java
@@ -79,12 +79,16 @@ public class IntrospectionPropertyMethod extends IntrospectionProperty {
 	}
 	
 	@Override
-	public String getValue(final Object object) throws ExmlBuilderException {
+	public Object getValue(final Object object) throws ExmlBuilderException {
 		if (this.getter == null) {
 			throw new ExmlBuilderException("no getter availlable");
 		}
-		// TODO Auto-generated method stub
-		return null;
+		try {
+			return this.getter.invoke(object);
+		} catch (InvocationTargetException | IllegalAccessException | IllegalArgumentException e) {
+			e.printStackTrace();
+			throw new ExmlBuilderException("Can not set value ... " + e.getMessage());
+		}
 	}
 	
 	@Override
diff --git a/src/org/atriasoft/exml/generator/GeneratorIntrospection.java b/src/org/atriasoft/exml/generator/GeneratorIntrospection.java
index 3576cf1..730f1c4 100644
--- a/src/org/atriasoft/exml/generator/GeneratorIntrospection.java
+++ b/src/org/atriasoft/exml/generator/GeneratorIntrospection.java
@@ -6,6 +6,8 @@ import java.util.Map;
 
 import org.atriasoft.exml.builder.IntrospectionData;
 import org.atriasoft.exml.builder.IntrospectionProperty;
+import org.atriasoft.exml.exception.ExmlBuilderException;
+import org.atriasoft.exml.parser.Tools;
 
 public class GeneratorIntrospection implements Generator {
 	// Keep  in cach all the object alredy parsed ==> optimize CPU
@@ -20,7 +22,7 @@ public class GeneratorIntrospection implements Generator {
 		this.elements.put(classType, new IntrospectionData(classType, null));
 	}
 	
-	IntrospectionData findOrCreate(final Class<?> classType) throws Exception {
+	IntrospectionData findOrCreate(final Class<?> classType) throws ExmlBuilderException {
 		IntrospectionData out = this.elements.get(classType);
 		if (out != null) {
 			return out;
@@ -30,40 +32,54 @@ public class GeneratorIntrospection implements Generator {
 		return out;
 	}
 
-	public void generateProperties(final Object node, final IntrospectionData introspection, final StringBuilder tmpp) throws Exception {
+	public void generateProperties(final Object data, final IntrospectionData introspection, final StringBuilder tmpp) throws ExmlBuilderException {
 		List<IntrospectionProperty> elements = introspection.getProperties();
 		for (IntrospectionProperty elem : elements) {
 			if (!elem.canGetValue()) {
 				continue;
 			}
 			String name = elem.getNames()[0];
-			String data=elem.getValue(node);
+			String dataString=elem.getValueString(data);
 			tmpp.append(" ");
 			tmpp.append(name);
 			tmpp.append("=\"");
-			tmpp.append(data);
+			tmpp.append(dataString);
 			tmpp.append("\"");
 		}
 	}
-	public void generateSubNodes(final Object node, final IntrospectionData introspection, final StringBuilder tmpp) {
+	public void generateSubNodes(final Object data, final IntrospectionData introspection, final StringBuilder tmpp, int indent) throws ExmlBuilderException {
 		List<IntrospectionProperty> elements = introspection.getMethods();
 		for (IntrospectionProperty elem : elements) {
+			if (!elem.canGetValue()) {
+				continue;
+			}
+			String name = elem.getNames()[0];
 			
+			Object dataObj =elem.getValue(data);
+			
+			if (dataObj != null) {
+				generateNode(dataObj, name, tmpp, indent);
+			}
 		}
 	}
-	public void generateNode(final Object node, final String nodeName, final StringBuilder tmpp) throws Exception {
-		IntrospectionData introspection = findOrCreate(node.getClass());
+	public void generateNode(final Object data, final String nodeName, final StringBuilder tmpp, int indent) throws ExmlBuilderException {
+		IntrospectionData introspection = findOrCreate(data.getClass());
+		Tools.addIndent(tmpp, indent);
 		tmpp.append("<");
 		tmpp.append(nodeName);
-		generateProperties(node, introspection, tmpp);
-		tmpp.append(">\n");
-		generateSubNodes(node, introspection, tmpp);
-		tmpp.append("</");
-		tmpp.append(nodeName);
-		tmpp.append(">\n");
-		
+		generateProperties(data, introspection, tmpp);
+		if (introspection.getMethods().size() != 0) {
+			tmpp.append(">\n");
+			generateSubNodes(data, introspection, tmpp, indent + 1);
+			Tools.addIndent(tmpp, indent);
+			tmpp.append("</");
+			tmpp.append(nodeName);
+			tmpp.append(">\n");
+		} else {
+			tmpp.append("/>\n");
+		}
 	}
-	public void generate(final Object root, final StringBuilder tmpp) throws Exception {
-		generateNode(root, this.rootNodeName, tmpp);
+	public void generate(final Object root, final StringBuilder tmpp) throws ExmlBuilderException {
+		generateNode(root, this.rootNodeName, tmpp, 0);
 	}
 }
diff --git a/src/org/atriasoft/exml/parser/Tools.java b/src/org/atriasoft/exml/parser/Tools.java
index 1f7081e..c92c058 100644
--- a/src/org/atriasoft/exml/parser/Tools.java
+++ b/src/org/atriasoft/exml/parser/Tools.java
@@ -149,7 +149,7 @@ public class Tools {
 		return false;
 	}
 	
-	public static Boolean[] parseBooleanClassStringList(String data) { // throws NumberFormatException
+	public static Boolean[] parseBooleanClassStringList(String data) {
 		data = Tools.cleanNumberList(data);
 		final String[] dataArray = data.split(";");
 		final Boolean[] out = new Boolean[dataArray.length];
@@ -159,8 +159,18 @@ public class Tools {
 		}
 		return out;
 	}
+	public static String toString(Boolean[] data) {
+		StringBuilder out = new StringBuilder();
+		for (int iii=0; iii<data.length; iii++) {
+			if (iii != 0) {
+				out.append(";");
+			}
+			out.append(data[iii]);
+		}
+		return out.toString();
+	}
 	
-	public static boolean[] parseBooleanStringList(String data) { // throws NumberFormatException
+	public static boolean[] parseBooleanStringList(String data) {
 		data = Tools.cleanNumberList(data);
 		final String[] dataArray = data.split(";");
 		final boolean[] out = new boolean[dataArray.length];
@@ -170,8 +180,18 @@ public class Tools {
 		}
 		return out;
 	}
+	public static String toString(boolean[] data) {
+		StringBuilder out = new StringBuilder();
+		for (int iii=0; iii<data.length; iii++) {
+			if (iii != 0) {
+				out.append(";");
+			}
+			out.append(data[iii]);
+		}
+		return out.toString();
+	}
 	
-	public static Byte[] parseByteClassStringList(String data) { // throws NumberFormatException
+	public static Byte[] parseByteClassStringList(String data) {
 		data = Tools.cleanNumberList(data);
 		final String[] dataArray = data.split(";");
 		final Byte[] out = new Byte[dataArray.length];
@@ -181,8 +201,19 @@ public class Tools {
 		}
 		return out;
 	}
+
+	public static String toString(Byte[] data) {
+		StringBuilder out = new StringBuilder();
+		for (int iii=0; iii<data.length; iii++) {
+			if (iii != 0) {
+				out.append(";");
+			}
+			out.append(data[iii]);
+		}
+		return out.toString();
+	}
 	
-	public static byte[] parseByteStringList(String data) { // throws NumberFormatException
+	public static byte[] parseByteStringList(String data) {
 		data = Tools.cleanNumberList(data);
 		final String[] dataArray = data.split(";");
 		final byte[] out = new byte[dataArray.length];
@@ -192,8 +223,18 @@ public class Tools {
 		}
 		return out;
 	}
+	public static String toString(byte[] data) {
+		StringBuilder out = new StringBuilder();
+		for (int iii=0; iii<data.length; iii++) {
+			if (iii != 0) {
+				out.append(";");
+			}
+			out.append(data[iii]);
+		}
+		return out.toString();
+	}
 	
-	public static Integer[] parseIntegerClassStringList(String data) { // throws NumberFormatException
+	public static Integer[] parseIntegerClassStringList(String data) {
 		data = Tools.cleanNumberList(data);
 		final String[] dataArray = data.split(";");
 		final Integer[] out = new Integer[dataArray.length];
@@ -203,8 +244,18 @@ public class Tools {
 		}
 		return out;
 	}
+	public static String toString(Integer[] data) {
+		StringBuilder out = new StringBuilder();
+		for (int iii=0; iii<data.length; iii++) {
+			if (iii != 0) {
+				out.append(";");
+			}
+			out.append(data[iii]);
+		}
+		return out.toString();
+	}
 	
-	public static int[] parseIntegerStringList(String data) { // throws NumberFormatException
+	public static int[] parseIntegerStringList(String data) {
 		data = Tools.cleanNumberList(data);
 		final String[] dataArray = data.split(";");
 		final int[] out = new int[dataArray.length];
@@ -214,8 +265,18 @@ public class Tools {
 		}
 		return out;
 	}
+	public static String toString(int[] data) {
+		StringBuilder out = new StringBuilder();
+		for (int iii=0; iii<data.length; iii++) {
+			if (iii != 0) {
+				out.append(";");
+			}
+			out.append(data[iii]);
+		}
+		return out.toString();
+	}
 	
-	public static Long[] parseLongClassStringList(String data) { // throws NumberFormatException
+	public static Long[] parseLongClassStringList(String data) {
 		data = Tools.cleanNumberList(data);
 		final String[] dataArray = data.split(";");
 		final Long[] out = new Long[dataArray.length];
@@ -225,8 +286,18 @@ public class Tools {
 		}
 		return out;
 	}
+	public static String toString(Long[] data) {
+		StringBuilder out = new StringBuilder();
+		for (int iii=0; iii<data.length; iii++) {
+			if (iii != 0) {
+				out.append(";");
+			}
+			out.append(data[iii]);
+		}
+		return out.toString();
+	}
 	
-	public static long[] parseLongStringList(String data) { // throws NumberFormatException
+	public static long[] parseLongStringList(String data) {
 		data = Tools.cleanNumberList(data);
 		final String[] dataArray = data.split(";");
 		final long[] out = new long[dataArray.length];
@@ -236,8 +307,18 @@ public class Tools {
 		}
 		return out;
 	}
+	public static String toString(long[] data) {
+		StringBuilder out = new StringBuilder();
+		for (int iii=0; iii<data.length; iii++) {
+			if (iii != 0) {
+				out.append(";");
+			}
+			out.append(data[iii]);
+		}
+		return out.toString();
+	}
 	
-	public static Short[] parseShortClassStringList(String data) { // throws NumberFormatException
+	public static Short[] parseShortClassStringList(String data) {
 		data = Tools.cleanNumberList(data);
 		final String[] dataArray = data.split(";");
 		final Short[] out = new Short[dataArray.length];
@@ -247,8 +328,19 @@ public class Tools {
 		}
 		return out;
 	}
+
+	public static String toString(Short[] data) {
+		StringBuilder out = new StringBuilder();
+		for (int iii=0; iii<data.length; iii++) {
+			if (iii != 0) {
+				out.append(";");
+			}
+			out.append(data[iii]);
+		}
+		return out.toString();
+	}
 	
-	public static short[] parseShortStringList(String data) { // throws NumberFormatException
+	public static short[] parseShortStringList(String data) {
 		data = Tools.cleanNumberList(data);
 		final String[] dataArray = data.split(";");
 		final short[] out = new short[dataArray.length];
@@ -258,6 +350,16 @@ public class Tools {
 		}
 		return out;
 	}
+	public static String toString(short[] data) {
+		StringBuilder out = new StringBuilder();
+		for (int iii=0; iii<data.length; iii++) {
+			if (iii != 0) {
+				out.append(";");
+			}
+			out.append(data[iii]);
+		}
+		return out.toString();
+	}
 	
 	// transform the Text with :
 	//	     "&lt;"   == "<"
diff --git a/test/src/test/atriasoft/exml/ExmlTestIntrospectionGenerate.java b/test/src/test/atriasoft/exml/ExmlTestIntrospectionGenerate.java
index dfad5ac..21d18cf 100644
--- a/test/src/test/atriasoft/exml/ExmlTestIntrospectionGenerate.java
+++ b/test/src/test/atriasoft/exml/ExmlTestIntrospectionGenerate.java
@@ -13,13 +13,15 @@ import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.Test;
 
 import test.atriasoft.exml.introspection.ClassPublicMemberOnly;
+import test.atriasoft.exml.introspection.ClassPublicMethodOnly;
+import test.atriasoft.exml.introspection.ClassPublicMethodeNode;
 
 public class ExmlTestIntrospectionGenerate {
 	@BeforeAll
 	public static void beforeClass() {
 		Log.verbose("----------------------------------------------------------------");
 	}
-	
+
 	@Test
 	public void test1() throws ExmlParserErrorMulti, ExmlBuilderException {
 		ClassPublicMemberOnly elem = new ClassPublicMemberOnly();
@@ -50,5 +52,66 @@ public class ExmlTestIntrospectionGenerate {
 		Log.warning("data generated: " + builder.toString());
 	}
 
+	@Test
+	public void test2() throws ExmlParserErrorMulti, ExmlBuilderException {
+		ClassPublicMethodOnly elem = new ClassPublicMethodOnly();
+		elem.setMemberArrayBoolean ( new boolean[] {false, true});
+		elem.setMemberArrayBooleanClass ( new Boolean[] {false, true, true});
+		elem.setMemberArrayByte ( new byte[] {21,21,58});
+		elem.setMemberArrayByteClass ( new Byte[] {54,21,65,32});
+		elem.setMemberArrayInteger ( new int[] { 1521,2151,2156,216354});
+		elem.setMemberArrayIntegerClass ( new Integer[] {5564,6546321,654564,231321,54654});
+		elem.setMemberArrayLong ( new long[] {6546544L,654654651L,5646546541L,5465465163L} );
+		elem.setMemberArrayLongClass ( new Long[] {561651L, 6541321L, 651351L});
+		elem.setMemberArrayShort ( new short[] {4564, -54,-564});
+		elem.setMemberArrayShortClass ( new Short[] {-54, 5646, -8465, 852});
+		elem.setMemberBoolean  ( false);
+		elem.setMemberBooleanClass ( true);
+		elem.setMemberByte ( (byte)12);
+		elem.setMemberByteClass  ( (byte)54);
+		elem.setMemberInteger ( 6543524);
+		elem.setMemberIntegerClass  ( 545666);
+		elem.setMemberLong ( 400000055L);
+		elem.setMemberLongClass ( 54654546L);
+		elem.setMemberShort ( (short)31252);
+		elem.setMemberShortClass ((short)-25212);
+		elem.setMemberStringClass ("lkjhlkjlkjlkj");
+		
+		StringBuilder builder = new StringBuilder();
+		Exml.generate(elem, "elem", builder);
+		Log.warning("data generated: " + builder.toString());
+	}
+	
+
+	@Test
+	public void test3() throws ExmlParserErrorMulti, ExmlBuilderException {
+		ClassPublicMethodeNode elem = new ClassPublicMethodeNode();
+		elem.setMemberArrayBoolean ( new boolean[] {false, true});
+		elem.setMemberArrayBooleanClass ( new Boolean[] {false, true, true});
+		elem.setMemberArrayByte ( new byte[] {21,21,58});
+		elem.setMemberArrayByteClass ( new Byte[] {54,21,65,32});
+		elem.setMemberArrayInteger ( new int[] { 1521,2151,2156,216354});
+		elem.setMemberArrayIntegerClass ( new Integer[] {5564,6546321,654564,231321,54654});
+		elem.setMemberArrayLong ( new long[] {6546544L,654654651L,5646546541L,5465465163L} );
+		elem.setMemberArrayLongClass ( new Long[] {561651L, 6541321L, 651351L});
+		elem.setMemberArrayShort ( new short[] {4564, -54,-564});
+		elem.setMemberArrayShortClass ( new Short[] {-54, 5646, -8465, 852});
+		elem.setMemberBoolean  ( false);
+		elem.setMemberBooleanClass ( true);
+		elem.setMemberByte ( (byte)12);
+		elem.setMemberByteClass  ( (byte)54);
+		elem.setMemberInteger ( 6543524);
+		elem.setMemberIntegerClass  ( 545666);
+		elem.setMemberLong ( 400000055L);
+		elem.setMemberLongClass ( 54654546L);
+		elem.setMemberShort ( (short)31252);
+		elem.setMemberShortClass ((short)-25212);
+		elem.setMemberStringClass ("lkjhlkjlkjlkj");
+		
+		StringBuilder builder = new StringBuilder();
+		Exml.generate(elem, "elem", builder);
+		Log.warning("data generated: " + builder.toString());
+	}
+
 }