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I think I had a similar problem with List in systemoptions. What seemed 
to fix the problem for me, was to firePropertyChanged afte the 
putProperty method...

Milos

Petr Suchomel wrote:

>I have r/w property in SystemOption, which type is HashMap.
>This type seem not to be serialized any more, although if map == null I do
>reinit, after restart of NB, when I ask for value, this value is again null.
>(This is only test example)
>
>    public java.util.HashMap getFileSystemSettings(){
>        java.util.HashMap map  =
>java.util.HashMap)getProperty( PROP_FS_SETTING );
>        if( map != null ){
>            System.err.println("Getting map size " + map.size());
>        }
>        else{
>            System.err.println("Getting map size null");
>            map = new java.util.HashMap();
>            map.put("test", "test");
>            setFileSystemSettings( map );
>        }
>        return map;
>    }
>
>    public void setFileSystemSettings(java.util.HashMap map){
>        putProperty( PROP_FS_SETTING, map, true );
>    }
>
>Petr
>