Java 6 classes when 1.7 is configured in Intellij/maven with scala plugin

As seen in the screenshot the module/project are set to jdk 1.7

Project / sdk set to 7:

Module set to jdk 7:

However from javap we are seeing java6 (50) ??

a) Confirm the class were just now compiled (7/22/15 @18:14) :

ls -l ./target/classes/org/yardstickframework/spark/DataGenerator.class
-rw-r--r--  1 steve  staff  3829 Jul 22 18:14 ./target/classes/org/yardstickframework/spark/DataGenerator.class

b) Which version of java?

javap -verbose ./target/classes/org/yardstickframework/spark/DataGenerator.class | grep ver
  minor version: 0
  major version: 50

Note: The pom.xml sets language level to jdk7

        <plugin>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.1</version>
            <configuration>
                <source>1.7</source>
                <target>1.7</target>
            </configuration>
        </plugin>

Update Per a suggestion I ran the compilation from command line :

mvn clean compile

This results also in jdk6 /major version=50. Now why would that be? I am examining the POM to see if other weirdness present.

Another update Per Roman's request: here is maven output

$mvn -v
Apache Maven 3.1.1 (0728685237757ffbf44136acec0402957f723d9a; 2013-09-17 08:22:22-0700)
Maven home: /usr/local/Cellar/maven/3.1.1/libexec
Java version: 1.7.0_25, vendor: Oracle Corporation
Java home: /Library/Java/JavaVirtualMachines/jdk1.7.0_25.jdk/Contents/Home/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "mac os x", version: "10.10", arch: "x86_64", family: "mac"

Yet another update ElliottFrisch suggested some additions to the maven compiler plugin. Here is the updated section:

        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.1</version>
            <configuration>
                <fork>true</fork>
                <verbose>true</verbose>
                <source>1.7</source>
                <target>1.7</target>
            </configuration>
        </plugin>

OK I am a bit sheepish on this. This is a scala project and the class files are outputs from the scala-maven plugin. So all those maven-compiler settings only apply to java source files. Sorry about that huge missing factoid folks.

The means to get the proper version within the scala-maven-plugin is not straightforward to determine: but luckily someone has figured it out:

http://xflin.blogspot.com/2013/08/mixed-scala-and-java-in-maven-project.html

Here is the key piece:

    <recompileMode>incremental</recompileMode>
    <args>
      <arg>-target:jvm-1.7</arg>
    </args>
    <javacArgs>
      <javacArg>-source</javacArg><javacArg>1.7</javacArg>
      <javacArg>-target</javacArg><javacArg>1.7</javacArg>
    </javacArgs>

That goes within the normal scala-maven-plugin section which looks like:

        <plugin>
            <version>3.2.1</version>
            <groupId>net.alchim31.maven</groupId>
            <artifactId>scala-maven-plugin</artifactId>
            <executions>
                <execution>
                    <goals>
                        <goal>compile</goal>
                        <goal>testCompile</goal>
                    </goals>
                </execution>
            </executions>
            <configuration>
                <scalaCompatVersion>${scala.version}</scalaCompatVersion>
                <scalaVersion>${scala.binary.version}</scalaVersion>
                <jvmArgs>
                    <jvmArg>-Xms512m</jvmArg>
                    <jvmArg>-Xmx1024m</jvmArg>
                </jvmArgs>
              <recompileMode>incremental</recompileMode>
              <args>
                <arg>-target:jvm-1.7</arg>
              </args>
              <javacArgs>
                <javacArg>-source</javacArg><javacArg>1.7</javacArg>
                <javacArg>-target</javacArg><javacArg>1.7</javacArg>
              </javacArgs>
          </configuration>
        </plugin>

After adding that piece to the scala plugin we now have:

$javap -verbose ./target/classes/org/yardstickframework/spark/DataGenerator.class | grep ver
  minor version: 0
  major version: 51