On 18 août, 01:30, Bob The Cheese <[email protected]> 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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