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Problem :

Using IntelliJ IDE can not compile any projects getting bellow error
error:java: javactask: source release 8 requires target release 1.8
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2 Answers

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Solution :

I fixed the issue just by changing target compile version to 1.8.

Please goto bellow path to change the target compile version to 1.8

File >> Settings >> Build, Execution, Deployment >> Compiler >> Java Compiler

Further Readings:

https://github.com/mccorby/FederatedServer/issues/2

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38,600 points
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Solution:

  1. File > Settings > Build, Execution, Deployment > Compiler > Java Compiler

  2. Alter Target bytecode version to 1.8 of the module that you are performing for.

In case you are employing Maven

Include the compiler plugin to pom.xml under the top-level project node:

<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>

Note: In case you don't mind reimporting your project, then the just conceive you truly require to do is alter the pom and reimport the project, then IntelliJ will collect the right settings and you don't have to manually alter them.

This seems like the kind of error that Maven originates at the time you don't have the compiler plugin configured properly. Here's an instance of a Java 8 compiler config.

<project xmlns="http://maven.apache.org/POM/4.0.0"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

<!-- ... -->

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.5.1</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>

<!-- ... -->

</project>

The quickest method I found:

  • First, Press:CTRL + SHIFT + A (For Mac ⌘ + SHIFT + A)

  • Then, type: java compiler

  • Lastly, press: ENTER

In the Settings window, fix the Target bytecode to 1.8

Like stated on the wiki page of the Apache Maven Compiler Plugin you can only fix the 2 properties employed by the plugin.

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

I solved this by going to Project Structure -> Modules, trace the module in question, click on Dependencies tab, alter Module SDK to Project SDK.

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31,120 points

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