IDEA: javac: source release 1.7 requires target release 1.7

Question

When running a JUnit test, using IntelliJ IDEA, I get

How can I correc

Answer 1

I resolved bellow method

File >> Project Structure >> Project >> Project Language Level --> do set proper version (ex: 1.5)

Answer 2

If it is a Gradle project, in your build.gradle file, search for following settings:

sourceCompatibility = "xx"
targetCompatibility = "xx"

For all subrpojects, in your root build.gradle file, you may put:

subprojects { project ->
    sourceCompatibility = "1.7"
    targetCompatibility = "1.7"
}

Although you can manually set language levels in Idea > Settings, if it is a Gradle project, Idea automatically synchronizes module .iml files from Gradle settings ( tested with Idea 15+). So all your manual changes are overriden when gradle is refreshed.

Based on Gradle documentation, if these are not set, then current JVM configuration is used.

Answer 3

IntelliJ 15, 2016 & 2017

Similar to that discussed below for IntelliJ 13 & 14, but with an extra level in the Settings/Preferences panel: Settings > Build, Execution, Deployment > Compiler > Java Compiler.

IntelliJ 13 & 14

In IntelliJ 13 and 14, check the Settings > Compiler > Java Compiler UI to ensure you're not targeting a different bytecode version in your module.

Answer 4

I've found required options ('target bytecode version') in settings > compiler > java compiler in my case (intelij idea 12.1.3)

Answer 5

Modify the compiler setting file of the project in the following path and change the 'target' to 1.7:

/project/.idea/compiler.xml

<bytecodeTargetLevel>
  <module name="project-name" target="1.7" />
</bytecodeTargetLevel>

Answer 6

Most likely you have incorrect compiler options imported from Maven here:

Also check project and module bytecode (target) version settings outlined on the screenshot.

Other places where the source language level is configured:

• Project Structure | Project

• Project Structure | Modules (check every module) | Sources

Maven default language level is 1.5 (5.0), you will see this version as the Module language level on the screenshot above.

This can be changed using maven-compiler-plugin configuration inside pom.xml:

<project>
  [...]
  <build>
    [...]
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <configuration>
          <source>1.8</source>
          <target>1.8</target>
        </configuration>
      </plugin>
    </plugins>
    [...]
  </build>
  [...]
</project>

or

<project>
  [...]
  <properties>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
  </properties>
  [...]
</project>

IntelliJ IDEA will respect this setting after you Reimport the Maven project in the Maven Projects tool window: