Problems with java.lang.ClassNotFoundException
Joakim Sjöberg
Hi!
I have just started with gin in my GWT project and I have
followed the tutorial. Now I have
a problem that I cannot figure out. It seems that my DivTestModule class is not
found, even
though it all looks correct in the code, from what I can see. But now I am
getting this error:
Found type 'DivTestInjector'
Resolving annotation '@GinModules(DivTestModule.class)'
[ERROR]
java.lang.ClassNotFoundException: org.gwt.client.gin.DivTestModule
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:247)
at com.google.gwt.dev.javac.TypeOracleMediator.getClassLiteral(TypeOracleMediator.java:753)
at com.google.gwt.dev.javac.TypeOracleMediator.getAnnotationElementValue(TypeOracleMediator.java:664)
at com.google.gwt.dev.javac.TypeOracleMediator.createAnnotationInstance(TypeOracleMediator.java:432)
at com.google.gwt.dev.javac.TypeOracleMediator.resolveAnnotation(TypeOracleMediator.java:826)
at com.google.gwt.dev.javac.TypeOracleMediator.resolveAnnotations(TypeOracleMediator.java:847)
at com.google.gwt.dev.javac.TypeOracleMediator.resolveTypeDeclaration(TypeOracleMediator.java:1374)
at com.google.gwt.dev.javac.TypeOracleMediator.refresh(TypeOracleMediator.java:382)
at com.google.gwt.dev.javac.CompilationState.compile(CompilationState.java:137)
at com.google.gwt.dev.GWTCompiler.distill(GWTCompiler.java:327)
at com.google.gwt.dev.GWTCompiler.run(GWTCompiler.java:564)
at com.google.gwt.dev.GWTCompiler.run(GWTCompiler.java:554)
at com.google.gwt.dev.GWTCompiler.main(GWTCompiler.java:214)
Exception in thread "main" java.lang.NullPointerException
at com.google.gwt.dev.javac.TypeOracleMediator.getAnnotationElementValue(TypeOracleMediator.java:694)
at com.google.gwt.dev.javac.TypeOracleMediator.createAnnotationInstance(TypeOracleMediator.java:432)
at com.google.gwt.dev.javac.TypeOracleMediator.resolveAnnotation(TypeOracleMediator.java:826)
at com.google.gwt.dev.javac.TypeOracleMediator.resolveAnnotations(TypeOracleMediator.java:847)
at com.google.gwt.dev.javac.TypeOracleMediator.resolveTypeDeclaration(TypeOracleMediator.java:1374)
at com.google.gwt.dev.javac.TypeOracleMediator.refresh(TypeOracleMediator.java:382)
at com.google.gwt.dev.javac.CompilationState.compile(CompilationState.java:137)
at com.google.gwt.dev.GWTCompiler.distill(GWTCompiler.java:327)
at com.google.gwt.dev.GWTCompiler.run(GWTCompiler.java:564)
at com.google.gwt.dev.GWTCompiler.run(GWTCompiler.java:554)
at com.google.gwt.dev.GWTCompiler.main(GWTCompiler.java:214)
Is this anything you have experienced before?
Joakim Sjöberg
Technical Consultant
Artificial Solutions Scandinavia AB
Österlånggatan 43 4tr
111 31 Stockholm
Sweden
Phone: +46 8 586 120 63
Mobile: +46 765 271833
Fax: +46 8 663 67 77
Email: joakim....@artificial-solutions.com
Web: www.artificial-solutions.com
Peter Schmitt
Peter
Joakim Sjöberg
Hi Peter!
Have you had the time to look at this? Is there something you can help me with?
Joakim Sjöberg
From:
googl...@googlegroups.com [mailto:googl...@googlegroups.com] On Behalf
Of Peter Schmitt
Sent: Friday, March 20, 2009 5:12 PM
To: googl...@googlegroups.com
Subject: [google-gin] Re: Problems with java.lang.ClassNotFoundException
I haven't seen a problem like
this before, can you give us some more context (code, package structure,
gwt.xml)? The error looks like it's connected to the initial GWT compilation of
the code, and it looks like the GWT compiler can't find your org.gwt.client.gin.DivTestModule
class. That might be because it's not covered by your classpath or
because it's not in the gwt.xml.
Peter
Joakim Sjöberg
I have realized that I need Guice also to make Gin work, I have when I get this error below Guice 1.0 installed. Saw now that I need a trunk build (r803 or higher), were can I get that?
Regards
Joakim
From:
googl...@googlegroups.com [mailto:googl...@googlegroups.com] On Behalf
Of Peter Schmitt
Sent: Friday, March 20, 2009 5:12 PM
To: googl...@googlegroups.com
Subject: [google-gin] Re: Problems with java.lang.ClassNotFoundException
I haven't seen a problem like
this before, can you give us some more context (code, package structure,
gwt.xml)? The error looks like it's connected to the initial GWT compilation of
the code, and it looks like the GWT compiler can't find your org.gwt.client.gin.DivTestModule
class. That might be because it's not covered by your classpath or
because it's not in the gwt.xml.
Peter
Brian Stoler
Joakim Sjöberg
Ah ok so It works with the 2.0 Beta?
Brian Stoler
Joakim Sjöberg
Great, could the problems we are experience below come from that we are using version 1.0?
// Joakim
Brian Stoler
Joakim Sjöberg
Hi I have now tried with 2.0 version and I am still getting the same error:
Found type 'DivTestInjector'
Resolving annotation '@GinModules(DivTestModule.class)'
[ERROR]
java.lang.ClassNotFoundException: org.gwt.client.gin.DivTestModule
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
Can anyone help me with this?
I have added the few java files I am using for my test, maybe I am doing something wrong?
Joakim Sjöberg
Was there anyone who could help me with this issue? Since I’m totally stuck I really need some help J
// Joakim
Peter Schmitt
I'm currently a bit short on time but I'll take a look. A first glance didn't reveal any obvious problems.
Peter
Peter Schmitt
Please try if that works for you and if this is the bug you're running into, please file it with the GWT issue tracker.
Hope this helps!
Peter
Joakim Sjöberg
Hi Peter!
I changed the name of my package to org.source, org.source.client and org.soruce.gin but I still get the same problem. Is there anything else I have to think of?
Thank you for all the help so far.
Peter Schmitt
I'd say in that case your problem lies in the dependencies you use. Take a look at rftgstats.googlecode.com for the jar files I used and the ant file I use for compilation (you can copy it and should only have to change the gwt.module property inside the file, provided your java lies in the folder src).
I'll probably prepare a tutorial and example for properly setting up a project with Gin in the future, but it might take a while.
Peter
Joakim Sjöberg
´Hi Peter!
I took a look at this code but since I’m quite new to this I
really don´t understand what to check for J
is there some way I can upload my whole project to you? Will that help? I use
the same libraries now
as you do at least but no changes, still the same error.
Hope you can forgive me for all the questions, it just seems that I am so close to get this working, and
I really want it to work J
Joakim Sjöberg
Oh and I am using Netbeans and GWT 1.5.3 if that makes any difference.
Peter Schmitt
I don't know how you compile your project and I think it shouldn't cause this error, but you might want to check whether you compile your client classes and provide the resulting files to the GWT compiler. I.e. for Gin to work, you need to do the following:
1. Compile your client package using javac (not GWTCompiler!), classpath must contain client source, gin, gwt-user.jar and guice.jar
2. Compile your client package using GWTCompiler, classpath must contain gwt-dev-*.jar, gwt-user.jar, gin, guice.jar, client source AND compiled classes from step 1.
Peter