myfaces-html5-core/src/main/java/org/apache/myfaces/html5/handler/DragSourceBehaviorHandler.java [215:238]:
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    private void _checkEvent(ClientBehaviorHolder holder, String eventName)
    {
        Collection<String> eventNames = holder.getEventNames();

        if (!eventNames.contains(eventName))
        {
            StringBuilder message = new StringBuilder();
            message.append("Unable to attach DragSourceBehavior.  ");
            message.append("DragSourceBehavior may only be attached to ");
            message.append("ClientBehaviorHolders that support the '");
            message.append(eventName);
            message.append("' event.  The parent ClientBehaviorHolder "
                    + DebugUtils.getPathToComponent((UIComponent) holder) + " only ");
            message.append("supports the following events: ");

            for (String supportedEventName : eventNames)
            {
                message.append(supportedEventName);
                message.append(" ");
            }

            throw new TagException(getTag(), message.toString());
        }
    }
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myfaces-html5-core/src/main/java/org/apache/myfaces/html5/handler/DropTargetBehaviorHandler.java [290:313]:
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    private void _checkEvent(ClientBehaviorHolder holder, String eventName)
    {
        Collection<String> eventNames = holder.getEventNames();

        if (!eventNames.contains(eventName))
        {
            StringBuilder message = new StringBuilder();
            message.append("Unable to attach DropTargetBehavior.  ");
            message.append("DropTargetBehavior may only be attached to ");
            message.append("ClientBehaviorHolders that support the '");
            message.append(eventName);
            message.append("' event.  The parent ClientBehaviorHolder "
                    + DebugUtils.getPathToComponent((UIComponent) holder) + " only ");
            message.append("supports the following events: ");

            for (String supportedEventName : eventNames)
            {
                message.append(supportedEventName);
                message.append(" ");
            }

            throw new TagException(getTag(), message.toString());
        }
    }
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