Intellij Idea 10.5 and Maven+GWT - Cannot resolve directory - gwt

Question

I created maven project with command line:
mvn archetype:generate
-DarchetypeRepository=repo1.maven.org
-DarchetypeGroupId=org.codehaus.mojo
-DarchetypeArtifactId=gwt-maven-plugin
-DarchetypeVersion=2.3.0-1
Then I opened it in Intellij Idea 10.5, and received some errors from Maven Model Inspector:
Cannot resolve directory ''${webappDirectory}'' (at line 59)
Cannot resolve directory 'WEB-INF' (at line 59)
Cannot resolve file 'classes' (at line 59)
In spite of this the project compile and run normally. What is this?
Part of my pom.xml:
<build>
<!-- Generate compiled stuff in the folder used for developing mode -->
<outputDirectory>${webappDirectory}/WEB-INF/classes</outputDirectory>
. . .
</build>

Answer 1

in the beginning of your pom.xml file in the properties section there should be this tag:
<webappDirectory>${project.build.directory}/${project.build.finalName}</webappDirectory>
That's where the ${webappDirectory} "variable" is defined.
When you place the cursor over the text inside the brackets and press ctrl + q, you will see a small explanation for the variables (Intellj Idea specific)
${project.build.directory} = Model Property project.build.directory: ${project.basedir}/target
${project.build.finalName} = Model Property project.build.finalName: ${project.artifactId}-${project.version}
<outputDirectory>...</outputDirectory> configures where the compiled classes are put (As the comment above your snippet already says).
Have a look into your projectDir/target directory.
But I can't tell you what this means for development mode.
Btw. i've put <!--suppress MavenModelInspection --> above <outputDirectory> to get rid of the red mark in the editor.
Whoops, that seems to be a pretty old question :)
Guess you already know!
Regards