How to change Java version for Maven in IntelliJ?

Question

I\'m new to both Maven and IntelliJ IDEA.

I have a Maven project written in Java 8. Whenever I try to build it (Maven Projects window -> Lifecycle -> compile -> Run

Answer 1

Adding below lines to root(project level) pom.xml worked me to resolve above issue: (both of the options worked for me)

Option 1:

<properties>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
</properties>

Option 2:

<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>

originally posted at: IntelliJ IDEA 13 uses Java 1.5 despite setting to 1.7

Answer 2

Change the source as shown below in pom.xml

<build>
        <finalName>MQService</finalName>
        <plugins>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>

Answer 3

open the ubuntu terminal goto your root directory and type:

export JAVA_HOME = <path to jdk>

for example, it works fine for me {do the same in IntelliJ terminal}.

export JAVA_HOME=/usr/lib/jvm/java-11-openjdk-amd64

to check the set value type echo $JAVA_HOME

to check the maven version type: mvn -version

you can find all path of JDKs by typing this command, and you can set JDK version.

sudo update-alternatives --config java

also check you have same java -version and javac -version.

Answer 4

I don't think any response to the question addressed the concern - ". . . in IntelliJ".

Here are the steps: -

• Go to Preferences in IntelliJ ( or Shortcut ⌘ + ,)
• Build, Execution, Deployment > Maven > Importer - select the "JDK for Importer" dropdown then select your preferred java version, Click Apply
• Build, Execution, Deployment > Maven > Runner - select the "JRE" dropdown then select your preferred java version, Click Apply
• Click OK

Answer 5

There are two ways of doing this :

First- Add Properties

<properties>
  <maven.compiler.source>1.8</maven.compiler.source>
  <maven.compiler.target>1.8</maven.compiler.target>
</properties>

second- Add Plugin

<plugin>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.5.1</version>
        <configuration>
            <source>1.8</source>
            <target>1.8</target>
        </configuration>
</plugin>

Answer 6

You should add below code in your pom.xml to force the language level to change

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <configuration>
                <source>8</source>
                <target>8</target>
            </configuration>
        </plugin>
    </plugins>
</build>

now intelliJ 2019.3 CE does this for you if you go to import then alt+enter where you will get an option saying "change language level to 8 to use this functionality"