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**Isomorphic** · 28 Jun 2011, 08:38

3rd party code (in prototype.js) is crashing, not SmartGWT.

**stagirus** · 7 Jul 2011, 09:34

Please look at the error details below. It appears that
com.smartgwt.client.core.JsObject is causing this problem. If I am mistaken, please correct me, after all I am no JavaScript expert. Is it possible that SmartGWT has a name collision with another module (GWM/prototype.js)? This could happen if SmartGWT and GWM are using different versions of prototype.js. Even if the problem was not caused by SmartGWT, you guys are smart. Could you point me to some direction to troubleshoot this issue?

11:12:57.046 [ERROR] [client] 11:12:57.046:WARN:Log:Error: 'Function expected' in http://127.0.0.1:8888/client/gwm/ext/scripts/prototype.js at line 313
anonymous(iterator=>anonymous()) anonymous(iterator=>"frozen", true) ListGrid.deriveFrozenFields() ListGrid.deriveVisibleFields() ListGrid.setFields(_1=>Array[1]) ListGrid.prepareForDraw() ListGrid.draw(_1=>undef, _2=>undef, _3=>undef, _4=>undef) Layout.layoutChildren(_1=>"initial draw", _2=>undef, _3=>undef) Layout.drawChildren() Canvas.draw(_1=>undef) Canvas.drawChildren() ** recursed on Canvas.draw
com.smartgwt.client.core.JsObject$SGWT_WARN: 11:12:57.046:WARN:Log:Error: 'Function expected' in http://127.0.0.1:8888/client/gwm/ext/scripts/prototype.js at line 313
anonymous(iterator=>anonymous()) anonymous(iterator=>"frozen", true) ListGrid.deriveFrozenFields() ListGrid.deriveVisibleFields() ListGrid.setFields(_1=>Array[1]) ListGrid.prepareForDraw() ListGrid.draw(_1=>undef, _2=>undef, _3=>undef, _4=>undef) Layout.layoutChildren(_1=>"initial draw", _2=>undef, _3=>undef) Layout.drawChildren() Canvas.draw(_1=>undef) Canvas.drawChildren() ** recursed on Canvas.draw
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
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:167)
at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessagesWhileWaitingForReturn(BrowserChannelServer.java:326)
at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:207)
at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:132)
at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:561)
at com.google.gwt.dev.shell.ModuleSpace.invokeNativeVoid(ModuleSpace.java:289)
at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeVoid(JavaScriptHost.java:107)
at com.smartgwt.client.widgets.BaseWidget.draw(BaseWidget.java)
at com.smartgwt.client.widgets.BaseWidget.getElement(BaseWidget.java:292)
at com.smartgwt.client.widgets.BaseWidget.getElement(BaseWidget.java:264)
at com.google.gwt.user.client.ui.ComplexPanel.add(ComplexPanel.java:94)
at com.google.gwt.user.client.ui.HorizontalPanel.add(HorizontalPanel.java:49)
at ....

**Isomorphic** · 7 Jul 2011, 10:07

We don't use prototype.js. The first line of the stack trace indicates a crash in prototype.js:

11:12:57.046 [ERROR] [client] 11:12:57.046:WARN:Log:Error: 'Function expected' in http://127.0.0.1:8888/client/gwm/ext/scripts/prototype.js at line 313

It's probably something along the lines of a collision in functionality added to native objects such as Array. Note we fixed one such known collision after 2.4, so you might try a nightly.

**stagirus** · 7 Jul 2011, 13:14

Your responses are not YET helpful for me. I tried SmartGWT nightly builds but no improvement yet.

You said "The first line of the stack trace indicates a crash in prototype.js"
But the second line also indicates that SmartGWT "com.smartgwt.client.core.JsObject" is somehow involved in this issue. prototype.js is part part of GWM library. We got many modules that do not use SmartGWT and they all work fine. This one particular module that uses SmartGWT crashing indicates to me that SmartGWT could be the main actor. Could you be a little more open to better understand and resolve this issue?

**Isomorphic** · 7 Jul 2011, 14:44

We've actually pointed you right to the problem twice now: "It's probably something along the lines of a collision in functionality added to native objects such as Array" - this means you have to look at the line in question in your copy of prototype.js and figure out what native function prototype is overriding.

You may not be familiar enough with JavaScript to handle this, but that's not us being unhelpful, we can't run your code to see the problem.

It may also help to switch the order of imports so SmartGWT is last. This will cause SmartGWT to override methods installed by prototype.js instead of vice versa, and the methods installed by SmartGWT may handle a superset of prototype's needs but not vice versa.

**stagirus** · 7 Jul 2011, 16:06

Thank you. The above response was somewhat helpful. I am not sure where we can control the imports or the classpath in a deployment(war) file where the lib directory has above 300 jar files. Do you guys have any other suggestions?

The line 313 points to
if (iterator(value, index))
in the following code. I also attached the actual prototype.js.

var Enumerable = {......
findAll: function(iterator) {
var results = [];
this.each(function(value, index) {
if (iterator(value, index))
results.push(value);
});
return results;
},

**Isomorphic** · 7 Jul 2011, 16:10

It's not .jar files. Reorder your .gwt.xml <inherits> to put SmartGWT last.

**stagirus** · 7 Jul 2011, 17:24

You made my day sir. That worked. Thank you very much. During our recent refactoring, SmartGWT moved up in the imports/inherits. That seems to be the cause of this problem.

Obviously, "import" and "include" have so many (overridden) meanings!

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