Exception: java.lang.NoClassDefFoundError: com/google/gwt/dev/DevMode

[saranya]

Someone please help

I  am new to GWT. I am getting below exception when I try to debug.

java.lang.NoClassDefFoundError: com/google/gwt/dev/DevMode

Caused by: java.lang.ClassNotFoundException: com.google.gwt.dev.DevMode

at java.net.URLClassLoader$1.run(URLClassLoader.java:200)

at java.security.AccessController.doPrivileged(Native Method)

at java.net.URLClassLoader.findClass(URLClassLoader.java:188)

at java.lang.ClassLoader.loadClass(ClassLoader.java:306)

at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:276)

at java.lang.ClassLoader.loadClass(ClassLoader.java:251)

at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)

Exception in thread "main" 

Any idea on this?

[Jens]

Looks like you do not have gwt-dev.jar on classpath.

-- J.

[saranya]

Thanks Jen.  problem with my plugin. Finally it's working.

[Sachin Chaudhari]

Hi Sara, what you did with plugin. I mean My one application runs perfectly with that plugin.  But second application giving "java.lang.ClassNotFoundException:at com.google.gwt.dev.DevMode$ArgHandlerServer.setString(DevMode.java:177)

at com.google.gwt.util.tools.ArgHandlerString.handle(ArgHandlerString.java:26)

at com.google.gwt.util.tools.ToolBase.processArgs(ToolBase.java:250)

at com.google.gwt.dev.ArgProcessorBase.processArgs(ArgProcessorBase.java:30)

at com.google.gwt.dev.DevMode.main(DevMode.java:412)

Google Web Toolkit 2.7.0

"

[Thomas Broyer]

Your problem is different. Line 177 in DevMode.java in GWT 2.7 indicates that you're passing a -server argument to DevMode whose value references a class absent from the classpath (one possibility is using AppEngine but not having the appengine JAR in the classpath). There should be a message on the standard error just above the stacktrace.