Problem in saving while drag & drop in Mac(specific) Urgent !!!

The mothod below return the session object that is stored in the text file. after reteriving the i type cast the object accordingly.
The main problem is :-
this method works properly when i do normal save in my programme.
But when i drag the text from one swing component(jtextpane) and drop the text to another swing component(jtextpane) and then save session in file. While savinf it doesnt give me any error. but while reteriving object from file it gives me "NullPointerException" exception on
session = in.readObject();
this line.
same method is executing everytime for reteriving object from file it works. but im not able to understand only on drag and drop its not wrking properly.
private Object getSessionForFile(String fileName) {
Connection con=null;
Object session=null;
try{
String path = "c:/cases/"+fileName+".txt";
logger.debug(path);
FileInputStream fis = new FileInputStream(path);
ObjectInputStream in = new ObjectInputStream(fis);
session = in.readObject();
in.close();
//logger.debug(session.getSessionId());
}catch(Exception e){
e.printStackTrace();
logger.error(e,e);
logger.debug("Error reading the specified file.");
return session;
Can anyone help me.

Here is the stack trace for above problem
java.lang.NullPointerException
        at javax.swing.text.AbstractDocument$AbstractElement.readObject(AbstractDocument.java:2216)
ERROR [AWT-EventQueue-0] (OpenPatient.java:722) - java.lang.NullPointerException
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
java.lang.NullPointerException
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at javax.swing.text.AbstractDocument$AbstractElement.readObject(AbstractDocument.java:2216)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:946)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1809)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1719)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
        at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:946)
         at java.io.ObjectInputStream.readObject(ObjectInputStream.java:348)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at ui.OpenPatient.getSessionForFile(OpenPatient.java:717)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1719)
        at ui.OpenPatient.btnOkActionPerformed(OpenPatient.java:583)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:348)
        Edited by: sunlover1984 on Mar 18, 2009 10:59 PM

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TOP INCLUDE:
DATA: BEGIN OF g_t_plan_alv_m OCCURS 0,
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DATA:    handle_style         TYPE lvc_t_styl,
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DATA: END OF g_t_plan_alv_m.
CLASS cl_gui_resources DEFINITION LOAD.
CLASS lcl_events_dragdrop DEFINITION DEFERRED.
DATA:
     BEGIN OF g_ty_s_outtab OCCURS 0,
       header,
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DATA:     handle_style         TYPE lvc_t_styl,
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DATA: g_field TYPE lvc_fname.
DATA:
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      gr_dragdrop            TYPE REF TO cl_dragdrop,
      gr_dragdrop_background TYPE REF TO cl_dragdrop.
CLASS lcl_events_dragdrop DEFINITION.
PUBLIC SECTION.
    DATA: m_grid TYPE i.
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                          IMPORTING e_row
                                    e_column
                                    es_row_no
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     ondrop               FOR EVENT ondrop
                          OF cl_gui_alv_grid
                          IMPORTING e_row
                                    e_column
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     ondropcomplete       FOR EVENT ondropcomplete
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                          IMPORTING e_row
                                    e_column
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     ondropgetflavor      FOR EVENT ondropgetflavor
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*       CLASS lcl_dragdrop_obj DEFINITION
CLASS lcl_dragdrop_obj DEFINITION.
PUBLIC SECTION.
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ENDCLASS.                    "lcl_dragdrop_obj DEFINITION
CLASS lcl_events_dragdrop IMPLEMENTATION.
METHOD ondrag.
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ENDMETHOD.                    "ondrag
METHOD ondrop.
    PERFORM event_ondrop USING e_row
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ENDMETHOD.                    "ondrop
METHOD ondropcomplete.
    PERFORM event_ondropcomplete USING e_row
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METHOD ondropgetflavor.
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DATA: l_effect                     TYPE i,
         l_dragdrop_handle            TYPE i,
         ls_dragdrop                  TYPE lvc_s_dd01,
         ls_drag_cell                 TYPE lvc_s_drdr,
         lt_drag_cells                TYPE lvc_t_drdr,
         ls_fcat                      TYPE lvc_s_fcat,
         l_field                      TYPE lvc_fname,
         l_source                     TYPE char1,
         l_target                     TYPE char1,
         l_alv_exclude_tab            TYPE ui_functions,
         l_variant                    TYPE disvariant.
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ls_dragdrop-row_ddid = space.
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(103123)

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at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
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1. No java 2 plugin - install it.
2.drag & drop between AWT & Swing Frames(windows)
3. Add the following text to your java.policy file and restart your computer.
grant {
permission java.awt.AWTPermission "accessEventQueue";
permission java.awt.AWTPermission "setDropTarget";
permission java.awt.AWTPermission "accessClipboard";
permission java.awt.AWTPermission "acceptDropBetweenAccessControllerContexts";
permission java.awt.AWTPermission "listenToAllAWTEvents";
please let me know if this works.
good luck

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how do you drag and drop using mac laptop?

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these reads may be helpful:one and two.
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Thanks,
Jason
Edit: I looked in my java console and saw that my issue was that we signed this jar file with a different certificate. I created a special config as Francois has suggested in another post and included only the DnD.jar file and it worked. However, I can't get the image or multi-line text areas to drag and drop. I'll keep poking around and see if I can figure out what's going on. The console seems to recognize when I'm dragging and dropping from all fields.
Edited by: hanszarkov on Jun 27, 2011 12:58 PM

Strange Problem Drag & Drop Between Lists

In the following code, drag & drop is set to copy objects, but when more than one instance of an item exists, only the last item (highest data provider index) item can be selected. Any idea why this is happening, and how to correct this?
<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
creationComplete="init();">
<mx:Script>
    <![CDATA[
      import mx.collections.ArrayCollection;
      [Bindable] private var srcAC:ArrayCollection = new ArrayCollection();
      [Bindable] private var destAC:ArrayCollection = new ArrayCollection();
      private function init():void{
        srcAC = new ArrayCollection(['Fish', 'Meat', 'Chicken']);
        destAC = new ArrayCollection();
      private function displayData():void{
        trace("****************************************");
        trace("menuList dataProvider:");
        for each(var srcItem:Object in srcAC){
          trace("\t" + srcItem.toString());
        trace("----------------------------------------");
        trace("orderList dataProvider:");
        for each(var destItem:Object in destAC){
          trace("\t" + destItem.toString());
    ]]>
</mx:Script>
<mx:HBox>
    <mx:VBox>
      <mx:Label text="Today's Menu" fontWeight="bold" fontSize="14"/>
      <mx:List id="menuList" width="200" dataProvider="{srcAC}"
        dragEnabled="true" dropEnabled="true" dragMoveEnabled="false"
        allowMultipleSelection="true" fontSize="14"/>
    </mx:VBox>
    <mx:VBox>
      <mx:Label text="Your Order" fontWeight="bold" fontSize="14"/>
      <mx:List id="orderList" width="200" dataProvider="{destAC}"
        dragEnabled="true" dropEnabled="true" dragMoveEnabled="false"
        allowMultipleSelection="true" fontSize="14"/>
    </mx:VBox>
</mx:HBox>
<mx:Button id="b1" label="Reset Order" click="init();"/>
<mx:Button label="Display Data Providers" click="displayData();"/>
</mx:Application>

Hello
Actually I have also face this problem in one of my appliocation so have done some work arround for that.
If we use object of ArrayCollection as 'key-value' (like- {label:'Fish'} ) pair than it work fine.
srcAC = new ArrayCollection([ {label:'Fish'},{label:'Meat'},{label:'Chicken'}]);
In case of
srcAC = new ArrayCollection(['Fish', 'Meat', 'Chicken']);
If we drop same item two times than list is not identify unique item of the list
and if we use objet like- {label:'Fish'} than every item is unique for list.
I m not sure this is right or not but it works fine.
Also we need to set 'labelField' of list as per object.
With Regards
Virat Patel

Problem in saving while drag & drop in Mac(specific) Urgent !!!

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