Hi,
I’m just starting with Vaadin and I’m trying to test it out by deploying the example project that is created by the Vaadin plug-in for Eclipse to Google App Engine. I followed the directions at https://vaadin.com/wiki/-/wiki/Main/Google%20AppEngine%20HOWTO, set up a GAE project and deployed it successfully. I’m able to see the static index page, but when I make a request to the generated servlet, I get a ClassNotFoundException for GAEVaadinServlet.
I did a search and found that someone was able to solve this issue a few years ago by going to the Java Build Path and editing the Ivy libraries to load files from “retrieved artifacts” instead of from the cache (https://vaadin.com/forum/#!/thread/2442343/2603772). This did not solve the problem for me, and I found that the JARs in my project’s lib/ folder change every time I edit one of the Ivy library entries on the build path…even if I don’t actually change anything. No matter what I do, Eclipse complains of at least a couple JARs missing (the exact JARs missing change every time), preventing me from being able to build the project. I checked the cache, and am able to see the “missing” JARs there.
I’ve never worked with Ivy before, so I’m not sure if there’s something I’m doing wrong there, but I haven’t made any changes to the default settings unless instructed to.
I’m very confused by the behavior I’m seeing and have no idea what I’m doing wrong. Any help is appreciated.