Re: CellTable - TextColumn.getValue (null) - another strange problem
Am Mittwoch, 26. Juni 2013 10:10:17 UTC+2 schrieb Thomas Broyer: > > Looks like > https://code.google.com/p/google-web-toolkit/issues/detail?id=7030 Thank you! > This can cause a call to the Column's getValue(T object) with a null > value, when the HasDataPresenter.setVisibleRange is called and null values > are inserted at the beginning of the (pending) rowData collection and the > focus in on one of the cells within those rows. "and null values are inserted at the beginning of the (pending) rowData collection": I am not sure how to interpret this: The only time when I (my code) insert values into the list is within the onRangeChange method. Then, I make an aynchroneous server call and when it returns, I insert the data like this: -- -- Pager pgr = getPager (); Range r = pgr.getDisplay().getVisibleRange(); int start = r.getStart(); pvrovider.updateRowData (start,lst); // lst contains the data -- -- I am really sure that there are no null values within this data... The issue you pointed to was posted in 2011. Is it still unsolved in GWT? Magnus -- You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. To unsubscribe from this group and stop receiving emails from it, send an email to google-web-toolkit+unsubscr...@googlegroups.com. To post to this group, send email to google-web-toolkit@googlegroups.com. Visit this group at http://groups.google.com/group/google-web-toolkit. For more options, visit https://groups.google.com/groups/opt_out.
Re: CellTable - TextColumn.getValue (null) - another strange problem
Looks like
https://code.google.com/p/google-web-toolkit/issues/detail?id=7030
On Wednesday, June 26, 2013 8:23:13 AM UTC+2, Magnus wrote:
>
> Hello,
>
> after setting an UncaughtExceptionHandler with
> GWT.setUncaughtExceptionHandler()
> for the first time, I see a new NullPointerException that I did not see
> before and which did not cause any visible problems.
>
> The exception occurrs, because the getValue methods of the table's columns
> are called with a null value, e. g.:
>
> --
> --
> TextColumn col_Start = new TextColumn()
> {
>@Override
>public String getValue(Game obj)
>{
> return (obj.str_Start); // exception, obj is null!
>}
> };
> --
> --
>
> As said above, there seem to be no consequences. The table's contents seem
> to be ok. Also, when I check for null values and return "???" instead, the
> "???" will not appear in the table.
> Nevertheless, I do not want to ignore it. Since the getValue methods are
> called by the GWT framework, I believe that there must be a problem with my
> own code (rather than a bug in GWT).
>
> It onlly happens, when I navigate from the second page back to the first
> one, so I assume a problem within the onRangeChange callback method.
>
> However, I have outsourced most of the CellTable handling into a seperate
> class CellListController (see below). So if there was a problem with my
> code, it would most likely be located there.
> But I really don't know where to start, because I cannot imagine any
> reason why the framework should call my methods with null values?
>
> Any ideas?
>
> Thank you
> Magnus
>
> --
> --
>
> public class CellListController
> {
> public CellListCarrier crr = null;
> public CellTable tbl = null;
> public AsyncDataProvider pvd = null;
> public Pager pgr = null;
>
> // Construction
>
> public CellListController ()
> {
> super ();
> }
>
> public CellListController (CellListCarrier crr)
> {
> setCarrier (crr);
> }
>
> // Component Creation
>
> public void createAll (Pager pgr,int pageSize)
> {
> createTable();
> setPageSize (pageSize);
> createProvider();
> setPager(pgr);
> }
>
> public void createTable ()
> {
> CellTable t = new CellTable ();
> setTable (t);
> }
>
> public void createProvider ()
> {
> pvd = new AsyncDataProvider()
> {
>@Override
>protected void onRangeChanged(HasData display)
>{
> Range r = display.getVisibleRange();
> int start = r.getStart() + 1;
> int end = start + r.getLength() - 1;
>
> onRangeChange (start,end);
>}
> };
> }
>
> // Settings
> public void setCarrier (CellListCarrier crr)
> {
> this.crr = crr;
> }
>
> public void setTable (CellTable tbl)
> {
> this.tbl = tbl;
> tbl.setPageStart (0);
> }
>
> public void setPager (Pager pgr)
> {
> this.pgr = pgr;
> pgr.setDisplay(tbl);
> pgr.setRangeLimited(true);
> }
>
> public void setPageSize (int pageSize)
> {
> tbl.setPageSize (pageSize);
> }
>
> public int getStart ()
> {
> Range r = pgr.getDisplay().getVisibleRange();
> int start = r.getStart();
>
> return (start);
> }
>
> // Data
> public void load ()
> {
> pvd.addDataDisplay(tbl);
> }
>
> public void reload ()
> {
> Range r = tbl.getVisibleRange();
> reload (r);
> }
>
> public void reload (Range r)
> {
> tbl.setVisibleRangeAndClearData (r,true);
>
> if (!isLoaded ())
>load ();
> }
>
> public void reloadLast ()
> {
> int n = tbl.getRowCount();
>
> Range r = getLastRange (n);
>
> reload (r);
> }
>
> public void reloadFirst ()
> {
> int p = tbl.getPageSize();
> Range r = new Range (0,p);
> reload (r);
> }
>
> public Range getLastRange (int cnt)
> {
> int p = tbl.getPageSize();
> int s = cnt - p;
>
> if (s < 0)
>s = 0;
>
> Range r = new Range (s,p);
>
> return (r);
> }
>
> public void scheduleReload ()
> {
> Scheduler.get().scheduleDeferred
> (
>new ScheduledCommand()
>{
> @Override
> public void execute()
> {
> reloadFirst ();
> }
>}
> );
> }
>
> // Callback Methods
>
> public void onRangeChange (int i0,int i1)
> {
> awi.log("CellListController.onRangeChange(" + i0 + "," + i1 + ")");
>
> crr.loadRecordList (i0,i1);
> crr.loadRecordCount ();
> }
>
> public void updateRowData (List lst)
> {
> if (lst == null)
>return;
>
> int start = getStart();
>
> pvd.updateRowData (start,lst);
> }
>
> public void updateRowCount (int cnt)
> {
> pvd.updateRowCount (cnt,true);
> }
>
> private boolean isLoaded ()
> {
> Set> s = pvd.getDataDisplays();
>
> if (s == null)
>return (false);
>
> if (s.isEmpty())
>return (false);
>
> ret
CellTable - TextColumn.getValue (null) - another strange problem
Hello,
after setting an UncaughtExceptionHandler with
GWT.setUncaughtExceptionHandler()
for the first time, I see a new NullPointerException that I did not see
before and which did not cause any visible problems.
The exception occurrs, because the getValue methods of the table's columns
are called with a null value, e. g.:
--
--
TextColumn col_Start = new TextColumn()
{
@Override
public String getValue(Game obj)
{
return (obj.str_Start); // exception, obj is null!
}
};
--
--
As said above, there seem to be no consequences. The table's contents seem
to be ok. Also, when I check for null values and return "???" instead, the
"???" will not appear in the table.
Nevertheless, I do not want to ignore it. Since the getValue methods are
called by the GWT framework, I believe that there must be a problem with my
own code (rather than a bug in GWT).
It onlly happens, when I navigate from the second page back to the first
one, so I assume a problem within the onRangeChange callback method.
However, I have outsourced most of the CellTable handling into a seperate
class CellListController (see below). So if there was a problem with my
code, it would most likely be located there.
But I really don't know where to start, because I cannot imagine any reason
why the framework should call my methods with null values?
Any ideas?
Thank you
Magnus
--
--
public class CellListController
{
public CellListCarrier crr = null;
public CellTable tbl = null;
public AsyncDataProvider pvd = null;
public Pager pgr = null;
// Construction
public CellListController ()
{
super ();
}
public CellListController (CellListCarrier crr)
{
setCarrier (crr);
}
// Component Creation
public void createAll (Pager pgr,int pageSize)
{
createTable();
setPageSize (pageSize);
createProvider();
setPager(pgr);
}
public void createTable ()
{
CellTable t = new CellTable ();
setTable (t);
}
public void createProvider ()
{
pvd = new AsyncDataProvider()
{
@Override
protected void onRangeChanged(HasData display)
{
Range r = display.getVisibleRange();
int start = r.getStart() + 1;
int end = start + r.getLength() - 1;
onRangeChange (start,end);
}
};
}
// Settings
public void setCarrier (CellListCarrier crr)
{
this.crr = crr;
}
public void setTable (CellTable tbl)
{
this.tbl = tbl;
tbl.setPageStart (0);
}
public void setPager (Pager pgr)
{
this.pgr = pgr;
pgr.setDisplay(tbl);
pgr.setRangeLimited(true);
}
public void setPageSize (int pageSize)
{
tbl.setPageSize (pageSize);
}
public int getStart ()
{
Range r = pgr.getDisplay().getVisibleRange();
int start = r.getStart();
return (start);
}
// Data
public void load ()
{
pvd.addDataDisplay(tbl);
}
public void reload ()
{
Range r = tbl.getVisibleRange();
reload (r);
}
public void reload (Range r)
{
tbl.setVisibleRangeAndClearData (r,true);
if (!isLoaded ())
load ();
}
public void reloadLast ()
{
int n = tbl.getRowCount();
Range r = getLastRange (n);
reload (r);
}
public void reloadFirst ()
{
int p = tbl.getPageSize();
Range r = new Range (0,p);
reload (r);
}
public Range getLastRange (int cnt)
{
int p = tbl.getPageSize();
int s = cnt - p;
if (s < 0)
s = 0;
Range r = new Range (s,p);
return (r);
}
public void scheduleReload ()
{
Scheduler.get().scheduleDeferred
(
new ScheduledCommand()
{
@Override
public void execute()
{
reloadFirst ();
}
}
);
}
// Callback Methods
public void onRangeChange (int i0,int i1)
{
awi.log("CellListController.onRangeChange(" + i0 + "," + i1 + ")");
crr.loadRecordList (i0,i1);
crr.loadRecordCount ();
}
public void updateRowData (List lst)
{
if (lst == null)
return;
int start = getStart();
pvd.updateRowData (start,lst);
}
public void updateRowCount (int cnt)
{
pvd.updateRowCount (cnt,true);
}
private boolean isLoaded ()
{
Set> s = pvd.getDataDisplays();
if (s == null)
return (false);
if (s.isEmpty())
return (false);
return (true);
}
}
--
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