Index: continuum-1.1/continuum-webapp/src/main/java/org/apache/maven/continuum/web/action/admin/InstallationAction.java
===================================================================
--- continuum-1.1/continuum-webapp/src/main/java/org/apache/maven/continuum/web/action/admin/InstallationAction.java	(revision 7993)
+++ continuum-1.1/continuum-webapp/src/main/java/org/apache/maven/continuum/web/action/admin/InstallationAction.java	(working copy)
@@ -118,22 +118,41 @@
     public String save()
         throws Exception
     {
+    	boolean hasInstallation = false;
+    	this.list();
+    	if ( this.installations != null )
+    	{
+            for ( Installation item : this.installations )
+            {
+                if ( ( item.getInstallationId() != this.installation.getInstallationId() ) && ( item.getName().equals( this.installation.getName() ) ) )
+                {
+                    hasInstallation = true;
+                    break;
+                }
+            }
+    	}
         if ( InstallationService.ENVVAR_TYPE.equalsIgnoreCase( this.getInstallationType() ) )
         {
             this.installation.setType( InstallationService.ENVVAR_TYPE );
         }
+    	this.configureUiFlags();
+    	if ( !hasInstallation )
+    	{
         if ( installation.getInstallationId() == 0 )
         {
             installationService.add( installation, this.automaticProfile );
         }
         else
         {
-            this.configureUiFlags();
             installationService.update( installation );
-            return "edit";
         }
-        this.configureUiFlags();
         return SUCCESS;
+    	}
+    	else
+    	{
+    	    addActionError( getText( "installation.name.duplicate" ) );
+    	    return "edit";
+    	}
     }
 
     public String delete()