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Editorial Team
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Asked: 2026-06-03T07:13:30+00:00

I created a new PlayN project from the 1.2 archetype using the command line

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I created a new PlayN project from the 1.2 archetype using the command line given in the GettingStarted wiki page. I then imported this Maven Project into Eclipse, just bringing in the core, java, and html modules. If I right-click the Java project, I can choose my main class, and a window pops up with the background image shown. Note that I’ve done no real programming yet: I’m just using the default project configuration.

Next, I used GWT-compile through Eclipse on the HTML project, and I got no errors. When I run it as a Web application by using the provided URL (without removing the “?gwt.codesvr=127.0.0.1:9997” bit), the application runs fine aside the Eclipse Console gives a warning about being in Development Mode. (Specifically, “You are running in GWT Development Mode. For optimal performance you may want to use an alternative method.”)

However, if I run the application the recommended way, by removing the gwt.codesvr parameter, then I keep getting a dialog box saying “GWT module ‘testproject’ may need to be (re)compiled.”

After reading How do I run a maven/eclipse/GWT/playN app in production mode?, I tried doing mvn test -Ptest-html
and then pointing my browser at http://localhost:8080, but it gives the same error.

Am I doing something wrong?

(EDIT: I have no idea if this next point is significant or not, but I’ll share it anyway. When I try to create a project from Eclipse, the newest PlayN archetype I can see is 1.0.3, even after telling Eclipse to update the Maven index. I’m running Eclipse Indigo.)

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1 Answer

  1. Editorial Team

    I guess you are running PlayN 1.0.3.

    There is a bug in 1.0.3:
    So you need to do the following:

    1. Run GWT-Compile

    2. Run the web application and get the error message: “GWT module ‘testproject’ may need to be (re)compiled.”

    3. Run again GWT-compile, while the Web-Application is running

    4. Reload your browser with CTRL-F5

    The important step is step 3.

    Note:
    You can update to PlayN 1.2 to get rid of the error. For this you have to change the file playn-showcase/pom.xml.

    Change the line
    <version>1.0.3</version>
    to
    <version>1.2</version>

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