curious class class not found exception
Presently, when i try to run my gwt application through eclipse I am
getting a curious:
java.lang.NoClassDefFoundError:
com/google/gwt/user/client/rpc/RemoteService
The intersting about this exception is that by command line firing a
gwt:run my project loads and runs just fine.
It is thorugh eclipse, where the classpath is even larger, that the
exception happens.
After creating a fancy perl script to farm the .jar files and directories
indicated by oracle visual vm for sun.java.classpath system variable, i was
able to track that my maven runtime project has this class under the
following loacations:
Search results are:
$VAR1 = {
'/home/nmatos/.m2/repository/com/google/gwt/gwt-servlet/2.4.0/gwt-servlet-2.4.0.jar'
= [
'com/google/gwt/user/client/rpc/RemoteService.class',
'com/google/gwt/user/client/rpc/RemoteServiceRelativePath.class'
],
'/home/nmatos/.m2/repository/com/google/gwt/gwt-user/2.4.0/gwt-user-2.4.0.jar'
= [
'com/google/gwt/user/client/rpc/RemoteService.class',
'com/google/gwt/user/client/rpc/RemoteService.java',
'com/google/gwt/user/client/rpc/RemoteServiceRelativePath.class',
'com/google/gwt/user/client/rpc/RemoteServiceRelativePath.java'
]
};
On the other hand, when I use the google eclipse plugin to lunch the
com.google.gwt.dev.DevMode , I have an even larger set of jar files
containing this class (due to overhead jars that originate from automatic
project configuration triggered by the eclipse plugin):
Search results are:
$VAR1 = {
'/home/nmatos/Desktop/Applications/eclipse_20121024/plugins/com.google.gwt.eclipse.sdkbundle_2.4.0.v201208080121-rel-r42/gwt-2.4.0/gwt-servlet.jar'
= [
'com/google/gwt/user/client/rpc/RemoteService.class',
'com/google/gwt/user/client/rpc/RemoteServiceRelativePath.class'
],
'/home/nmatos/Desktop/Applications/eclipse_20121024/plugins/com.google.gwt.eclipse.sdkbundle_2.4.0.v201208080121-rel-r42/gwt-2.4.0/gwt-user.jar'
= [
'com/google/gwt/user/client/rpc/RemoteService.class',
'com/google/gwt/user/client/rpc/RemoteService.java',
'com/google/gwt/user/client/rpc/RemoteServiceRelativePath.class',
'com/google/gwt/user/client/rpc/RemoteServiceRelativePath.java'
],
'/home/nmatos/.m2/repository/com/google/gwt/gwt-servlet/2.4.0/gwt-servlet-2.4.0.jar'
= [
'com/google/gwt/user/client/rpc/RemoteService.class',
'com/google/gwt/user/client/rpc/RemoteServiceRelativePath.class'
],
'/home/nmatos/.m2/repository/com/google/gwt/gwt-user/2.4.0/gwt-user-2.4.0.jar'
= [
Re: curious class class not found exception
And gwt-servlet.jar is in your war/WEB-INF/lib folder? In your stack trace you can see: at com.google.appengine.tools.development.IsolatedAppClassLoader.loadClass(IsolatedAppClassLoader.java:207) which indicates that you are using AppEngine. The IsolatedAppClassLoader JavaDoc states that it isolates the webapp from the DevAppServer and everything on system classpath. I don't know AppEngine but it sounds to me that only libs in WEB-INF/lib are allowed and it does not really matter whats on system class path. Maven probably put gwt-servlet.jar automatically into WEB-INF/lib if you have defined a dependency for it. -- J. -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/JFkMUXErsBoJ. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: curious class class not found exception
Thanks a lot and well spotted! What you just said makes all the sense in the world. I will take a look at my runtime lib folder in while. Thanks again. On Sunday, October 28, 2012 5:57:10 PM UTC+1, Jens wrote: And gwt-servlet.jar is in your war/WEB-INF/lib folder? In your stack trace you can see: at com.google.appengine.tools.development.IsolatedAppClassLoader.loadClass(IsolatedAppClassLoader.java:207) which indicates that you are using AppEngine. The IsolatedAppClassLoader JavaDoc states that it isolates the webapp from the DevAppServer and everything on system classpath. I don't know AppEngine but it sounds to me that only libs in WEB-INF/lib are allowed and it does not really matter whats on system class path. Maven probably put gwt-servlet.jar automatically into WEB-INF/lib if you have defined a dependency for it. -- J. -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/AkFz0i-_LbUJ. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
