Gwt - Unable to load module entry point class

Question

I've included the dnd jar in my gwt project(on the build path and on the class path) and when I execute the program the following exception occur. And I've also included the following line in the module : <inherits name='com.allen_sauer.gwt.dnd.gwt-dnd' />

 Unable to load module entry point class com.allen_sauer.gwt.dnd.client.util.DragEntryPoint

 java.lang.NoClassDefFoundError: com/google/gwt/core/client/EntryPoint
at java.lang.ClassLoader.findBootstrapClass(Native Method)
at java.lang.ClassLoader.findBootstrapClassOrNull(ClassLoader.java:1070)
at java.lang.ClassLoader.loadClass(ClassLoader.java:414)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
at com.google.gwt.dev.shell.CompilingClassLoader.loadClass(CompilingClassLoader.java:1192)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:274)
at com.google.gwt.dev.shell.ModuleSpace.loadClassFromSourceName(ModuleSpace.java:670)
at com.google.gwt.dev.shell.ModuleSpace.onLoad(ModuleSpace.java:378)
at com.google.gwt.dev.shell.OophmSessionHandler.loadModule(OophmSessionHandler.java:200)
at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:526)
at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:364)
at java.lang.Thread.run(Thread.java:745)

` I would like to understand why this error occur when a jar file is added to the project. For information i'm using the jdk 1.7

Answer 1

I have found the solution. The problem came from the app engine, I have disabled app engine on the run configuration and put the jar in the user entries instead of the putting it in the bootstrap entries, And everything worked.