I want to run tests with different java version than my source java version

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Ilamifet
Created

My main source has java version 7

I want to use java 8 from my tests. so i updated the compiler plugin to

 

<plugin>
   <groupId>org.apache.maven.plugins</groupId>
   <artifactId>maven-compiler-plugin</artifactId>
   <version>3.8.1</version>
   <configuration>
      <source>7</source>
      <target>7</target>
      <testSource>8</testSource>
      <testTarget>8</testTarget>
   </configuration>
</plugin>

This way I can use java 8 features in unit tests. This works fine when i run the tests using maven from commandline.

 

But when i run the test directly from intellij, it throughs error saying 'lambda expressions are not supported in source 7' 

looks like it use the same source version for tests. 

 

How do i configure Intellij to use different java version for tests

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Arina Efremova
Created

Hello,

Unfortunately, it is not supported at the moment.

We hope to add support for this configuration in one of the future updates. Related feature request on our issue tracker: IDEA-85478. Feel free to follow it for updates.

A workaround that you can try:

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>

It will unblock developers of libraries who need to target JRE 1.6 but want to use 1.8 in unit tests.

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