defined with no canvas property - creating a default canvas for this item

Smart GWT Technical Q&A
1

On the last two nightly builds from: 2010-09-24 and 2010-09-27 there is a bug. On several widgets that prevent correct initialization.
I’ve found that this concerns a least: SubmitItem and SectionItem.
Some warning that show up when trying to display form:

19:12:06.215:MUP1:WARN:SubmitItem:isc_SubmitItem_1:CanvasItem: isc_SubmitItem_0 defined with no canvas property - creating a default canvas for this item.
com.smartgwt.client.core.JsObject$SGWT_WARN: 19:12:06.215:MUP1:WARN:SubmitItem:isc_SubmitItem_1:CanvasItem: isc_SubmitItem_0 defined with no canvas property - creating a default canvas for this item.
    at sun.reflect.GeneratedConstructorAccessor14.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
...

19:12:06.338:MUP1:WARN:SectionItem:isc_SectionItem_1:CanvasItem: isc_SectionItem_0 defined with no canvas property - creating a default canvas for this item.
com.smartgwt.client.core.JsObject$SGWT_WARN: 19:12:06.338:MUP1:WARN:SectionItem:isc_SectionItem_1:CanvasItem: isc_SectionItem_0 defined with no canvas property - creating a default canvas for this item.
    at sun.reflect.GeneratedConstructorAccessor14.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
    at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:105)
    at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
    at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:157)
    at com.google.gwt.dev.shell.BrowserChannel.reactToMessagesWhileWaitingForReturn(BrowserChannel.java:1714)
...

All of that finishes with this error:

Uncaught exception escaped
com.google.gwt.core.client.JavaScriptException: (TypeError): this.canvas.setExpanded is not a function
2

With the 9/27 and 9/28 builds I’m also getting something similar with ButtonItems:

00:03:55.768 [ERROR] 12:03:44.171:WARN:ButtonItem:isc_ButtonItem_2:CanvasItem: ok defined with no canvas property - creating a default canvas for this item.
com.smartgwt.client.core.JsObject$SGWT_WARN: 12:03:44.171:WARN:ButtonItem:isc_ButtonItem_2:CanvasItem: ok defined with no canvas property - creating a default canvas for this item. at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)

3

Hi all,
This was a temporary regression -now fixed. The fix will show up in the next nightly build. Sorry for the inconvenience

4

Thanks Paul. I’ll look for the next build and confirm the fix.

5

OK. This problem was solved in 2010-09-29.
Best regards
Mariusz Goch