diff --git a/src/main/java/org/cyclopsgroup/jcli/annotation/Option.java b/src/main/java/org/cyclopsgroup/jcli/annotation/Option.java
index abcaed6..b7b5810 100644
--- a/src/main/java/org/cyclopsgroup/jcli/annotation/Option.java
+++ b/src/main/java/org/cyclopsgroup/jcli/annotation/Option.java
@@ -45,4 +45,9 @@
      * @return True if option has to be specified explicitly
      */
     boolean required() default false;
+    
+    /**
+     * @return Array of conflicting options
+     */
+    String[] conflicts() default { };
 }
diff --git a/src/main/java/org/cyclopsgroup/jcli/impl/AnnotationOption.java b/src/main/java/org/cyclopsgroup/jcli/impl/AnnotationOption.java
index b2564cc..00636c2 100644
--- a/src/main/java/org/cyclopsgroup/jcli/impl/AnnotationOption.java
+++ b/src/main/java/org/cyclopsgroup/jcli/impl/AnnotationOption.java
@@ -13,7 +13,7 @@ class AnnotationOption
 
     private final Option option;
 
-    AnnotationOption( Option option, boolean flag, boolean multiValue )
+    AnnotationOption( Option option, boolean flag, boolean multiValue)
     {
         this.option = option;
         this.flag = flag;
@@ -109,5 +109,13 @@ public boolean isRequired()
     {
         return option.required();
     }
+    
+    /**
+     * @inheritDoc
+     */
+    @Override
+    public String[] getConflicts(){
+    	return option.conflicts();
+    }
 
 }
diff --git a/src/main/java/org/cyclopsgroup/jcli/impl/DefaultBeanProcessor.java b/src/main/java/org/cyclopsgroup/jcli/impl/DefaultBeanProcessor.java
index 2a0b927..02940f8 100644
--- a/src/main/java/org/cyclopsgroup/jcli/impl/DefaultBeanProcessor.java
+++ b/src/main/java/org/cyclopsgroup/jcli/impl/DefaultBeanProcessor.java
@@ -1,12 +1,14 @@
 package org.cyclopsgroup.jcli.impl;
 
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
 import org.cyclopsgroup.jcli.spi.CommandLine;
 import org.cyclopsgroup.jcli.spi.CommandLineParser;
+import org.cyclopsgroup.jcli.spi.Option;
 
 class DefaultBeanProcessor
 {
@@ -49,6 +51,24 @@ static <T> void process( AnnotationParsingContext<T> context, List<String> argum
             MultiValueReference<T> ref = (MultiValueReference<T>) context.lookupReference( entry.getKey(), false );
             ref.setValues( bean, entry.getValue() );
         }
+        //END of data load into bean
+        for(CommandLine.OptionValue ov : cli.getOptionValues())
+        {
+        	Option cmOption;
+        	for(Option contextOption: context.options())
+        	{
+	        	Reference<T> ref = context.lookupReference( contextOption.getName(), false );
+	        	if(ref instanceof SingleValueReference<?> && ( (SingleValueReference<T>) ref ).getValue( bean ) == null)
+	        	{
+	        		continue;
+	        	}
+	        	
+	    		if((cmOption = context.optionWithShortName(ov.name)) != null &&
+	    				Arrays.asList(cmOption.getConflicts()).contains(contextOption.getName()))
+	    			throw new AssertionError("grande errore cmOption: " + cmOption.getName() + " : " + contextOption.getName());
+        	}
+        }
+        //
         Reference<T> ref = context.lookupReference( DefaultArgumentProcessor.ARGUMENT_REFERNCE_NAME, false );
         if ( ref == null )
         {
diff --git a/src/main/java/org/cyclopsgroup/jcli/impl/OptionHelp.java b/src/main/java/org/cyclopsgroup/jcli/impl/OptionHelp.java
index 0e72d8c..180e15e 100644
--- a/src/main/java/org/cyclopsgroup/jcli/impl/OptionHelp.java
+++ b/src/main/java/org/cyclopsgroup/jcli/impl/OptionHelp.java
@@ -10,7 +10,7 @@
  *
  * @author <a href="mailto:jiaqi@cyclopsgroup.org">Jiaqi Guo</a>
  */
-@FixLengthType( length = 256 )
+@FixLengthType( length = 485 )
 public class OptionHelp
 {
     private final Option option;
@@ -23,7 +23,7 @@ public class OptionHelp
     /**
      * @return Description of option
      */
-    @FixLengthField( start = 26, length = 228 )
+    @FixLengthField( start = 26, length = 256 )
     public String getDescription()
     {
         String desc = option.getDescription();
@@ -31,6 +31,10 @@ public String getDescription()
         {
             desc += "(Default value is " + option.getDefaultValue() + ")";
         }
+        if(option.getConflicts().length > 0)
+        {
+        	desc += ", conflicts [\"" + StringUtils.join(option.getConflicts(), "\",\"" ) + "\"]";
+        }
         return desc;
     }
 
diff --git a/src/main/java/org/cyclopsgroup/jcli/impl/SingleValueReference.java b/src/main/java/org/cyclopsgroup/jcli/impl/SingleValueReference.java
index ea0adec..8547691 100644
--- a/src/main/java/org/cyclopsgroup/jcli/impl/SingleValueReference.java
+++ b/src/main/java/org/cyclopsgroup/jcli/impl/SingleValueReference.java
@@ -21,4 +21,9 @@ void setValue( T bean, String value )
     {
         ref.writeValue( converter.fromCharacters( value ), bean );
     }
+    
+    public Object getValue( T bean)
+    {
+        return ref.isReadable() ? ref.readValue( bean ) : null;
+    }
 }
diff --git a/src/main/java/org/cyclopsgroup/jcli/spi/Option.java b/src/main/java/org/cyclopsgroup/jcli/spi/Option.java
index 03e07c6..0a7c714 100644
--- a/src/main/java/org/cyclopsgroup/jcli/spi/Option.java
+++ b/src/main/java/org/cyclopsgroup/jcli/spi/Option.java
@@ -46,4 +46,9 @@ public interface Option
      * @return True if option is required
      */
     boolean isRequired();
+    
+    /**
+     * @return Array of conflicting options
+     */
+    String[] getConflicts();
 }
diff --git a/src/test/java/org/cyclopsgroup/jcli/GnuParserTest.java b/src/test/java/org/cyclopsgroup/jcli/GnuParserTest.java
index 4a803a8..e57994d 100644
--- a/src/test/java/org/cyclopsgroup/jcli/GnuParserTest.java
+++ b/src/test/java/org/cyclopsgroup/jcli/GnuParserTest.java
@@ -17,6 +17,32 @@
  */
 public class GnuParserTest
 {
+	
+	/**
+     * Verify use cases with all possible types of arguments
+     */
+    @Test
+    public void testConflict()
+    {
+        ArgumentProcessor<Simple> p = ArgumentProcessor.newInstance( Simple.class, new GnuParser() );
+        Simple b = new Simple();
+        boolean thrown = false;
+        try{
+        	p.process( new String[] { "-c", "123", "a", "-f", "abc"}, b );
+        }catch(AssertionError e){
+        	thrown = true;
+        }
+        assertTrue("Conflict not detected", thrown);
+        thrown = false;
+        p = ArgumentProcessor.newInstance( Simple.class, new GnuParser() );
+        try{
+        	p.process( new String[] { "-c", "123", "a", "--field1", "abc"}, b );
+        }catch(AssertionError e){
+        	thrown = true;
+        }
+        assertTrue("Conflict not detected with long name", thrown);
+    }
+	
     /**
      * Verify use cases with all possible types of arguments
      */
diff --git a/src/test/java/org/cyclopsgroup/jcli/Simple.java b/src/test/java/org/cyclopsgroup/jcli/Simple.java
index c82ff89..c08915a 100644
--- a/src/test/java/org/cyclopsgroup/jcli/Simple.java
+++ b/src/test/java/org/cyclopsgroup/jcli/Simple.java
@@ -66,7 +66,17 @@ else if ( optionName.equals( "f" ) )
     private String stringFIeld2;
 
     private List<String> values;
+    
+    private String conflictFieldValue;
 
+    /**
+     * @return An integer option
+     */
+    public final String getFieldWithConflict()
+    {
+        return conflictFieldValue;
+    }
+    
     /**
      * @return An integer option
      */
@@ -106,6 +116,15 @@ public final boolean isBooleanField()
     {
         return booleanField;
     }
+    
+    /**
+     * @param conflict test
+     */
+    @Option( name = "c", longName = "conflict", description = "Test conflicts", conflicts = {"f"})
+    public final void setFieldWithConflict( String conflictFieldValue )
+    {
+        this.conflictFieldValue = conflictFieldValue;
+    }
 
     /**
      * @param booleanField A flag option