When importing Seam 2.3 examples (ex booking from http://anonsvn.jboss.org/repos/seam/branches/community/Seam_2_3/examples/booking/), Java projects are not configured properly and you get red error markers like

Plugin execution not covered by lifecycle configuration: org.apache.maven.plugins:maven-compiler-plugin:2.3.2:compile (execution: default-compile, phase: compile)

The problem is some parent configures the maven-compiler-plugin to use compilerId=eclipse, which is not supported out of the box by m2e (it only supports the default compilerId=javac).

To fix this issue, you have to either :

• Modify your parent pom.xml to map the compilerId=eclipse pluginExecution to the org.eclipse.m2e.jdt.javaConfigurator by adding

  <pluginManagement>
    <plugins>
      <plugin>
        <groupId>org.eclipse.m2e</groupId>
        <artifactId>lifecycle-mapping</artifactId>
        <version>1.0.0</version>
        <configuration>
          <lifecycleMappingMetadata>
            <pluginExecutions>
              <pluginExecution>
                <pluginExecutionFilter>
                  <groupId>org.apache.maven.plugins</groupId>
                  <artifactId>maven-compiler-plugin</artifactId>
                  <versionRange>[2.0,)</versionRange>
                  <goals>
                    <goal>compile</goal>
                    <goal>testCompile</goal>
                  </goals>
                <parameters>
                  <compilerId>eclipse</compilerId>
                </parameters>
               </pluginExecutionFilter>
               <action>
                 <configurator>
                   <id>org.eclipse.m2e.jdt.javaConfigurator</id>
                 </configurator>
               </action>
             </pluginExecution>
            </pluginExecutions>
          </lifecycleMappingMetadata>
        </configuration>
      </plugin>
    </plugins>
  </pluginManagement>
  

• or install m2e-jdt-compiler from http://download.jboss.org/jbosstools/builds/staging/m2e-jdt-compiler/all/repo/

2nd option is obviously far less intrusive. It requires m2e-jdt-compiler to be made available from a stable URL and added as a build requirement.