Inherited module error after adding GXT? - NoClassDefFoundError: com/google/gwt/core/ext/Generator?

Question

I am using GWT 2.5

GXT 2.5.1

App Engine 1.9.0

I am getting this error.

Loading modules
   com.java.operastar.Opera_Star
      Loading inherited module 'com.java.operastar.Opera_Star'
         Loading inherited module 'com.extjs.gxt.ui.GXT'
            [ERROR] Unexpected error while processing XML
java.lang.NoClassDefFoundError: com/google/gwt/core/ext/Generator
    at java.lang.ClassLoader.findBootstrapClass(Native Method)
    at java.lang.ClassLoader.findBootstrapClassOrNull(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at com.google.gwt.dev.cfg.ModuleDefSchema$ClassAttrCvt.convertToArg(ModuleDefSchema.java:884)
    at com.google.gwt.dev.util.xml.HandlerArgs.convertToArg(HandlerArgs.java:64)
.
.
.
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Can anybody help to solve this. Screen short

Please again have a look at [Setting Up Your First Ext GWT Project in Eclipse](http://www.sencha.com/blog/setting-up-your-first-ext-gwt-project-in-eclipse). — Braj, Apr 26 '14 at 09:11
Find your solution at [GWT 1.64 Class not found exception GXT module declaration is.](http://www.sencha.com/forum/showthread.php?131950-Loading-inherited-module-com.extjs.gxt.ui.GXT-**-com-google-gwt-core-ext-Generator) where the same problem is solved. — Braj, Apr 26 '14 at 09:12
Its working fine for me. I am using `GWT 2.5.0` and `gxt.2.2.1`. — Braj, Apr 26 '14 at 09:27
Please check your GXT version. [Announcing Sencha GXT 3.1 Beta](http://www.sencha.com/blog/announcing-gxt-3.1-beta) — Braj, Apr 26 '14 at 09:30
it was working fine for me previously for other projects. Yes there is gwt-dev.jar in class path. '' doent work. — GameBuilder, Apr 26 '14 at 09:40
Please validate what I have suggested in my post. Check the jars present in classpath. — Braj, Apr 26 '14 at 09:50

Braj · Accepted Answer · 2014-04-26T18:57:25.303

1

Most probably the issue is due to version mismatch between GWT and GXT.

Try any one option:

try with GWT 2.5.0 and GXT.2.2.1 as shown in screenshot

enter image description here

use below inherits in gwt.xml as shown in screenshot also

<inherits name='com.sencha.gxt.ui.GXT' />

instead of

<inherits name="com.extjs.gxt.ui.GXT" />

enter image description here

--EDIT--

Whenever you change the dependencies or GWT version. Just delete the last auto-generated stub as shown in below screenshot and re-compile the project again. A fresh start.

enter image description here

edited Apr 26 '14 at 18:57

answered Apr 26 '14 at 09:08

Braj

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the combination of 'GWT 2.5.0' and 'GXT 2.2.1' works . But still i see some errors in Console `Infos: Dev App Server is now running [ERROR] Failure in unit cache map load. java.util.concurrent.ExecutionException: java.lang.RuntimeException: Unable to read from byte cache at java.util.concurrent.FutureTask.report(Unknown Source)` – GameBuilder Apr 26 '14 at 10:22
Have a look at my edited post. Just delete the `gwt-unitCache` and other auto-generated stub after changing the GWT version and re-compile the project again. – Braj Apr 26 '14 at 18:56
Can you help me with this.. http://stackoverflow.com/questions/23326527/unable-to-load-module-entry-point-in-gwt-gxt-project – GameBuilder Apr 27 '14 at 17:51

Inherited module error after adding GXT? - NoClassDefFoundError: com/google/gwt/core/ext/Generator?

1 Answers1