Re: GWT 1.7 compiles null.nullMethod() into javascript for HTMLTable sub-class
aah, ok. thanks for that.
I'll try that out, and see if I can get it to work.
Cheers, Bob.
On Aug 18, 11:13 pm, Thomas Broyer wrote:
> On 18 août, 01:30, Bob The Cheese wrote:
>
>
>
> > OK, so I'm making a custom type of table which manages a datastore,
> > has expandable sections, etc.
>
> > I've borrowed a couple of things off FlexTable, but modified/
> > simplified them.
>
> > When I run the project, I get this:
> > ==
> > [ERROR] Failed to create an instance of 'vdc.module.billing.Billing'
> > via deferred binding
> > java.lang.NullPointerException: null
> > at com.google.gwt.user.client.ui.HTMLTable$CellFormatter.access$0
> > (HTMLTable.java:373)
> > at com.google.gwt.user.client.ui.HTMLTable.cleanCell(HTMLTable.java:
> > 1370)
> [...]
> > I compile the project out and run it in firefox, and pull up the error
> > here in the javascript:
> > ==
> > function $setHTML(this$static, row, column, html){
> > var td;
> > $prepareCell(this$static, row, column);
> > td = null.nullMethod();
> > $internalClearCell(this$static, td, html == null);
> > if (html != null) {
> > null.nullMethod();
> > }}
>
> > ==
>
> > in particular this line:
> > td = null.nullMethod();
>
> > I've looked around, and can't find anything which really explains to
> > me what's going wrong.
>
> Looking at the equivalent method in Java world:
> public void setHTML(int row, int column, String html) {
> prepareCell(row, column);
> Element td = cleanCell(row, column, html == null);
> if (html != null) {
> DOM.setInnerHTML(td, html);
> }
> }
> ...
> private Element cleanCell(int row, int column, boolean
> clearInnerHTML) {
> // Clear whatever is in the cell.
> Element td = getCellFormatter().getRawElement(row, column);
> internalClearCell(td, clearInnerHTML);
> return td;
> }
>
> It looks like getCellFormatter() always return 'null' so the compiler
> translated the getRawElement(row,column) into 'null.nullMethod()' to
> cause a "null pointer exception" equivalent in JavaScript.
>
> What it means is that you never ever called setCellFormatter(...)
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Re: GWT 1.7 compiles null.nullMethod() into javascript for HTMLTable sub-class
On 18 août, 01:30, Bob The Cheese wrote:
> OK, so I'm making a custom type of table which manages a datastore,
> has expandable sections, etc.
>
> I've borrowed a couple of things off FlexTable, but modified/
> simplified them.
>
> When I run the project, I get this:
> ==
> [ERROR] Failed to create an instance of 'vdc.module.billing.Billing'
> via deferred binding
> java.lang.NullPointerException: null
> at com.google.gwt.user.client.ui.HTMLTable$CellFormatter.access$0
> (HTMLTable.java:373)
> at com.google.gwt.user.client.ui.HTMLTable.cleanCell(HTMLTable.java:
> 1370)
[...]
> I compile the project out and run it in firefox, and pull up the error
> here in the javascript:
> ==
> function $setHTML(this$static, row, column, html){
> var td;
> $prepareCell(this$static, row, column);
> td = null.nullMethod();
> $internalClearCell(this$static, td, html == null);
> if (html != null) {
> null.nullMethod();
> }}
>
> ==
>
> in particular this line:
> td = null.nullMethod();
>
> I've looked around, and can't find anything which really explains to
> me what's going wrong.
Looking at the equivalent method in Java world:
public void setHTML(int row, int column, String html) {
prepareCell(row, column);
Element td = cleanCell(row, column, html == null);
if (html != null) {
DOM.setInnerHTML(td, html);
}
}
...
private Element cleanCell(int row, int column, boolean
clearInnerHTML) {
// Clear whatever is in the cell.
Element td = getCellFormatter().getRawElement(row, column);
internalClearCell(td, clearInnerHTML);
return td;
}
It looks like getCellFormatter() always return 'null' so the compiler
translated the getRawElement(row,column) into 'null.nullMethod()' to
cause a "null pointer exception" equivalent in JavaScript.
What it means is that you never ever called setCellFormatter(...)
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GWT 1.7 compiles null.nullMethod() into javascript for HTMLTable sub-class
OK, so I'm making a custom type of table which manages a datastore,
has expandable sections, etc.
I've borrowed a couple of things off FlexTable, but modified/
simplified them.
When I run the project, I get this:
==
[ERROR] Failed to create an instance of 'vdc.module.billing.Billing'
via deferred binding
java.lang.NullPointerException: null
at com.google.gwt.user.client.ui.HTMLTable$CellFormatter.access$0
(HTMLTable.java:373)
at com.google.gwt.user.client.ui.HTMLTable.cleanCell(HTMLTable.java:
1370)
at com.google.gwt.user.client.ui.HTMLTable.setHTML(HTMLTable.java:
1006)
at vdc.module.billing.clients.invoices.widget.InvoiceGrid.
(InvoiceGrid.java:18)
at vdc.module.billing.clients.invoices.Invoices.makeInvoiceGrid
(Invoices.java:169)
at vdc.module.billing.clients.invoices.Invoices.(Invoices.java:
110)
at vdc.module.billing.clients.Clients.(Clients.java:66)
at vdc.module.billing.Billing.(Billing.java:43)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance
(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance
(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at com.google.gwt.dev.shell.ModuleSpace.rebindAndCreate
(ModuleSpace.java:373)
at com.google.gwt.dev.shell.ModuleSpace.onLoad(ModuleSpace.java:318)
at com.google.gwt.dev.shell.BrowserWidget.attachModuleSpace
(BrowserWidget.java:343)
at com.google.gwt.dev.shell.moz.BrowserWidgetMoz.access$100
(BrowserWidgetMoz.java:35)
at com.google.gwt.dev.shell.moz.BrowserWidgetMoz
$ExternalObjectImpl.gwtOnLoad(BrowserWidgetMoz.java:58)
at org.eclipse.swt.internal.gtk.OS._g_main_context_iteration(Native
Method)
at org.eclipse.swt.internal.gtk.OS.g_main_context_iteration(OS.java:
1428)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2840)
at com.google.gwt.dev.SwtHostedModeBase.processEvents
(SwtHostedModeBase.java:235)
at com.google.gwt.dev.HostedModeBase.pumpEventLoop
(HostedModeBase.java:558)
at com.google.gwt.dev.HostedModeBase.run(HostedModeBase.java:405)
at com.google.gwt.dev.HostedMode.main(HostedMode.java:232)
==
I compile the project out and run it in firefox, and pull up the error
here in the javascript:
==
function $setHTML(this$static, row, column, html){
var td;
$prepareCell(this$static, row, column);
td = null.nullMethod();
$internalClearCell(this$static, td, html == null);
if (html != null) {
null.nullMethod();
}
}
==
in particular this line:
td = null.nullMethod();
I've looked around, and can't find anything which really explains to
me what's going wrong.
Here are the methods that I've overwritten
==
@Override
protected void prepareRow(int row) {
if (row < 0) {
throw new IndexOutOfBoundsException(
"Cannot create a row with a negative index: " + row);
}
int rowCount = getRowCount();
for (int i = rowCount; i <= row; i++) {
insertRow(i);
}
}
@Override
protected void prepareCell(int row, int column) {
prepareRow(row);
if (column < 0) {
throw new IndexOutOfBoundsException(
"Cannot create a column with a negative index: " +
column);
}
int cellCount = getCellCount(row);
for (int i = cellCount; i < column; i++) {
insertCell(row, i);
}
}
@Override
public int getCellCount(int row) {
if (row < 0) {
throw new IndexOutOfBoundsException(
"Cannot find a row with a negative index: " +
row);
}
// Initialize - 0 cells in a row
int count = 0;
// check if the row exists yet
int rows = getRowCount();
if (rows >= row) {
count = getDOMCellCount(row);
}
return count;
}
// and the constructor
public InvoiceGrid () {
// set the headers
setHTML(0,0," ");
setText(0,1,"Invoice Number");
setText(0,2,"Client Name");
setText(0,3,"Invoice Date");
setText(0,4,"Due Date");
setText(0,5,"Terms");
setText(0,6,"Ageing");
setText(0,7,"Amount");
setText(0,8,"Status");
}
==
Can anyone help me with this? Any clues as to what I've done wrong
here?
Thanks guys.
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