Mojo's Maven Plugin: errors with mvn gwt:run

Hello,

while evaluating different Maven plugins for GWT, I also created a test project with Mojo's Maven plugin.

But when running the application, I get errors (see below).

However, the error text doesn't seem to report an error and also a window "GWT Development Mode" is opened.

Why am I getting those errors?

Thanks
Magnus

$ mvn gwt:run

[INFO] Scanning for projects...

[INFO]                                                                         

[INFO] ------------------------------------------------------------------------

[INFO] Building Maven Archetype for GWT 1.0-SNAPSHOT

[INFO] ------------------------------------------------------------------------

[INFO] 

[INFO] >>> gwt-maven-plugin:2.8.0:run (default-cli) @ msm-app-tmj >>>

[INFO] 

[INFO] --- gwt-maven-plugin:2.8.0:generateAsync (default) @ msm-app-tmj ---

[INFO] 

[INFO] --- maven-resources-plugin:2.3:resources (default-resources) @ msm-app-tmj ---

[INFO] Using 'UTF-8' encoding to copy filtered resources.

[INFO] Copying 2 resources

[INFO] 

[INFO] --- maven-compiler-plugin:2.5.1:compile (default-compile) @ msm-app-tmj ---

[INFO] Nothing to compile - all classes are up to date

[INFO] 

[INFO] <<< gwt-maven-plugin:2.8.0:run (default-cli) @ msm-app-tmj <<<

[INFO] 

[INFO] --- gwt-maven-plugin:2.8.0:run (default-cli) @ msm-app-tmj ---

[INFO] create exploded Jetty webapp in /home/magnus/dvl/prj/msm-app-tmj/target/msm-app-tmj-1.0-SNAPSHOT

[INFO] Super Dev Mode starting up

[INFO]    workDir: /tmp/gwt-codeserver-3417683274978787027.tmp

[ERROR] 2017-02-24 04:47:54.846:INFO::main: Logging initialized @9736ms

[INFO]    Loading Java files in msm.app.tmj.mod.

[INFO]    Module setup completed in 10357 ms

[ERROR] 2017-02-24 04:48:00.940:INFO:oejs.Server:main: jetty-9.2.14.v20151106

[ERROR] 2017-02-24 04:48:01.041:INFO:oejsh.ContextHandler:main: Started o.e.j.s.ServletContextHandler@166913c2{/,null,AVAILABLE}

[INFO] [ERROR] 2017-02-24 04:48:01.132:INFO:oejs.ServerConnector:main: Started ServerConnector@22db12af{HTTP/1.1}{127.0.0.1:9876}

[ERROR] 2017-02-24 04:48:01.134:INFO:oejs.Server:main: Started @16025ms

[INFO] The code server is ready at http://127.0.0.1:9876/

[ERROR] 2017-02-24 04:48:01.574:INFO:oejs.Server:main: jetty-9.2.14.v20151106

[ERROR] 2017-02-24 04:48:02.526:INFO:oejsh.ContextHandler:main: Started c.g.g.d.s.j.WebAppContextWithReload@65ff5e07{/,file:/home/magnus/dvl/prj/msm-app-tmj/target/msm-app-tmj-1.0-SNAPSHOT/,AVAILABLE}{/home/magnus/dvl/prj/msm-app-tmj/target/msm-app-tmj-1.0-SNAPSHOT}

[ERROR] 2017-02-24 04:48:02.531:INFO:oejs.ServerConnector:main: Started ServerConnector@3d562fde{HTTP/1.1}{127.0.0.1:8888}

[ERROR] 2017-02-24 04:48:02.535:INFO:oejs.Server:main: Started @17426ms

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