SmartGWT onModuleLoad() threw an exception - gwt

Question

I'm getting the following exception, after I've added SmartGWT to an existing GWT project:
onModuleLoad() threw an exception
Exception while loading module com.smartgwt.client.SmartGwtEntryPoint. See Development Mode for details.
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.gwt.dev.shell.ModuleSpace.onLoad(ModuleSpace.java:396)
at com.google.gwt.dev.shell.OophmSessionHandler.loadModule(OophmSessionHandler.java:200)
at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:525)
at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:363)
at java.lang.Thread.run(Unknown Source)
Caused by: com.google.gwt.core.client.JavaScriptException: (TypeError): Unable to get value of the property 'Browser': object is null or undefined
at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:248)
at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:136)
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.SmartGwtEntryPoint.init(SmartGwtEntryPoint.java)
at com.smartgwt.client.SmartGwtEntryPoint.onModuleLoad(SmartGwtEntryPoint.java:239)
... 9 more
I've added the jar file to the build path, and also added the inherits node to the *.gwt.xml. What am I missing?

Answer 1

I had this issue. I attempted many different fixes, but in the end it appears that there were some resources (JavaScript files and CSS files) which were not being loaded because of authentication issues (I was using Spring security and forgot to provide access to some subfolders of my web application).
There are some important processes you need to go through when troubleshooting GWT apps. They can cause issues even when there aren't really any.
Clear your Browser cache
Use the code server query string (e.g. http://127.0.0.1:8888/index.html?gwt.codesvr=127.0.0.1:9997)
GWT compile your code
It could also be an issue with Google Chrome (if that's what you're using). The guys at SmartGWT suggest you don't use Chrome for GWT development.
http://forums.smartclient.com/showthread.php?t=8159#aChrome