Handle different language and target levels for sources and tests with IntelliJ IDEA

Question

I\'m interested if someone has clue how to handle this pom in projects properties of IDEA:

   org.apache.maven.plugins

        

Answer 1

As already mentioned different language levels for main and test sources are not yet supported by Idea.

There's a workaround to force Idea to use the language level defined in testSource when importing Maven project. You can create a separate Maven profile only for Idea with different compiler plugin settings:

<profiles>

    <profile>
        <id>default</id>
        <activation>
            <activeByDefault>true</activeByDefault>
        </activation>
        <build>
            <plugins>
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <version>3.2</version>
                    <configuration>
                        <source>1.6</source>
                        <target>1.6</target>
                        <testSource>1.8</testSource>
                        <testTarget>1.8</testTarget>
                    </configuration>
                </plugin>
            </plugins>
        </build>
    </profile>

    <profile>
        <id>ide</id>
        <activation>
            <activeByDefault>false</activeByDefault>
            <property>
                <name>idea.maven.embedder.version</name>
            </property>
        </activation>
        <build>
            <plugins>
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <version>3.2</version>
                    <configuration>
                        <source>1.8</source>
                        <target>1.8</target>
                        <testSource>1.8</testSource>
                        <testTarget>1.8</testTarget>
                    </configuration>
                </plugin>
            </plugins>
        </build>
    </profile>

</profile>

Answer 2

Supporting test source/target levels is tracked by this request. Language level changed message is also a known issue.