Java Project plus Vaadin Facet

[Jay4 (Jay B)]

I have been looking for this (see quoted thread below). I have a project which wouldn’t compile my widget set and therefore I couldn’t use some of the addons. I’m so glad I happened across this while browsing the forum.

However, after adding the “Vaadin Eclipse Integration” facet to my project and attempting to compile the widget set, I get the following, so there is still something I am missing:

Starting GWT compiler
Mar 30, 2011 10:17:14 AM com.vaadin.tools.WidgetsetCompiler$1 run
SEVERE: Widgetset compilation failed
java.lang.ClassNotFoundException: com.google.gwt.dev.GWTCompiler
	at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:169)
	at com.vaadin.tools.WidgetsetCompiler$1.run(WidgetsetCompiler.java:81)
	at java.lang.Thread.run(Thread.java:680)

Do I need to include the gwt compiler explicitly, and if so, how do I go about doing so?

If it is something else, please feel free to point me in the right direction.

Thanks,

Jay

Quoted Thread:

@Henri Sara

@erich oliphant

I am wondering. I the Vaadin integration for Eclipse installed, while the project was not originally created for vaadin, it has the vaadin tab

As we are speaking, I am noticing the builder is not inthe .project. Arrgh Will give it a shot.

Go to Project Properties → Project Facets and add the Vaadin facet. Under the configuration button, you probably want to disable automatically generating an application class etc.

If you only need the builder and not the rest of what is provided by the facet, making modifications on the Project Properties → Vaadin tab also automatically adds the builder if I remember correctly.

[Henri2 (Henri Sara)]

@Jay B

I have been looking for this (see quoted thread below). I have a project which wouldn’t compile my widget set and therefore I couldn’t use some of the addons. I’m so glad I happened across this while browsing the forum.

However, after adding the “Vaadin Eclipse Integration” facet to my project and attempting to compile the widget set, I get the following, so there is still something I am missing:

Starting GWT compiler
Mar 30, 2011 10:17:14 AM com.vaadin.tools.WidgetsetCompiler$1 run
SEVERE: Widgetset compilation failed
java.lang.ClassNotFoundException: com.google.gwt.dev.GWTCompiler
	at java.net.URLClassLoader$1.run(URLClassLoader.java:202)

Do I need to include the gwt compiler explicitly, and if so, how do I go about doing so?

The GWT JARs (gwt-user.jar and gwt-dev.jar) are automatically added to the project classpath (after downloading the correct versions for your Vaadin version, if necessary) when creating a Vaadin project or changing the Vaadin version in Project Properties → Vaadin.

Try to change to some other Vaadin version and then back on that tab. I hope that will help.

Otherwise, you can manually download the JARs and put them on your classpath, but then you have to know which versions are needed for your Vaadin version and upgrade them yourself when upgrading Vaadin.

[Jay4 (Jay B)]

Henri,

Thanks for your help. I wasn’t able to change my Vaadin version in my properties. I’m not sure why. Possibly because I only have one version available in my Eclipse. Whatever the reason, the select was disabled and I couldn’t change it.

However, thanks to your post, I did know what I needed; the gwt jars. With the help of my supervisor (because I’m new to maven) we were able to add the appropriate dependencies in maven and get the jars.

The widgetset now compiles fine.

Jay

[Kristjan (Kristjan Košič)]

Hi all,

I had the same problem. Managed to get it working with dependecies… But I still cant figure out why is the Vaadin download button, disabled in Project properties->Vaadin.

If I make a new clean project, then it is ok?

Any ideas? Otherwise this is a maven project, and was imported as existing maven project to workspace, then the additional plugin Vaadin was installed.

with br
Kristjan