[q] Rewind for ListEdit

[corsair]

Hello people!
Have question about rewind
I trying to write simple app with two pages
        Home page - for entering directory path
        List page - for list files of directory

for loop i use ListEdit and ListEditMap, which i init in pageBeginRender

in List template i show list of files, each file has delete button

task is very simple - on press delete button remove file from directory.

but after pressing delete button i receive NullPointerException



So how to solve such problem without saving directory path in session?


Full app without tapestry 3.0 libs as attachment.
_____________________
|Source of List page |
--------------------------------------


        /* (non-Javadoc)

         */
        public void pageBeginRender(PageEvent event) {
                if(!event.getRequestCycle().isRewinding()) {
                        File dir=new File(getPath());
                        String[] files=dir.list();
                        System.out.println(files);
                        ListEditMap editMap=new ListEditMap();
                        for (int i = 0; i < files.length; i++) {
                                editMap.add(files[i], files[i]);
                        }
                        setListEditMap(editMap);
                }
        }

        public void formSubmit(IRequestCycle cycle) {
                File fileName=new 
File(getFile()+File.pathSeparator+getDelete());
                if(fileName.isFile())
                        fileName.delete();
                System.out.println(getFile());
        }
        
        public void synchronize(IRequestCycle cycle)
    {
        ListEditMap map = getListEditMap();

        String fileName = (String) map.getValue();

        if (fileName == null)
        {
            throw new PageRedirectException(this);
        }

        setFile(fileName);
    }
        
        public abstract void setPath(String path);
        public abstract String getPath();
        
        public abstract void setFile(String file);
        public abstract String getFile();
        
        public abstract void setDelete(String file);
        public abstract String getDelete();
        
        public abstract void setListEditMap(ListEditMap editMap);
        public abstract ListEditMap getListEditMap();

problem is in rewind - in rewind form invoke pageBeginRender for init ListEditMap but in that time variable path is not defined yet and list cann't initialized public abstract class ListPage extends BasePage implements PageRenderListener{ * @see org.apache.tapestry.event.PageRenderListener#pageBeginRender(org.apache.tapestry.event.PageEvent)

test_app.tar.bz2
Description: application/bzip

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