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Problem with Java Language Levels in IntelliJ IDEA


Problem with Java Language Levels in IntelliJ IDEA

By : legolas19
Date : October 25 2020, 07:10 AM
I wish did fix the issue. The default Java version used by Maven is Java 5 (1.5) so I would reckon this is your issue.
Ensure you have the correct JDK for the language level you're trying to use Java 8 JDK. Set up your environment variables and follow the installation process as per the guidelines.
code :
<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>


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How to change language in IntelliJ IDEA?

How to change language in IntelliJ IDEA?


By : Mr Art
Date : March 29 2020, 07:55 AM
should help you out Do you mean the IDE language? Seems like you cannot, unless you localize it yourself...
Handle different language and target levels for sources and tests with IntelliJ IDEA

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


By : Jasim Bin Muhammed
Date : March 29 2020, 07:55 AM
like below fixes the issue Supporting test source/target levels is tracked by this request. Language level changed message is also a known issue.
Make Intellij IDEA allow lambda in java 5 6 7 language level with IDE support

Make Intellij IDEA allow lambda in java 5 6 7 language level with IDE support


By : ZOE LIMOLI
Date : March 29 2020, 07:55 AM
I hope this helps you . In IntelliJ IDEA you will need to set the language level for the module to be Java 8, or else IDEA will give red squiggly lines about lambda expressions.
In Settings | Inspections | Java language level migration aids | Usages of API documented as @since 1.5 (1.6|1.7) you can choose it to warn about usages of API that is documented as @since 1.8.
stop IntelliJ IDEA to switch java language level every time the pom is reloaded (or change the default project language

stop IntelliJ IDEA to switch java language level every time the pom is reloaded (or change the default project language


By : kim hall
Date : March 29 2020, 07:55 AM
hop of those help? Using IntelliJ 12, I have a java project and I use maven with a pom.xml. My project is using java8, but it seems the default project language level has been set to 6 while importing the project. , As per Mark's comment, here is how to do it:
code :
<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>
IntelliJ IDEA Gradle sync: Problem with setting Gradle's Java home to some JDKs

IntelliJ IDEA Gradle sync: Problem with setting Gradle's Java home to some JDKs


By : whallify
Date : March 29 2020, 07:55 AM
Hope this helps Finally, I found out the issue was from my IDE settings. It was from SDK Table.
I don't know why correcting them from Project Structure (or Structure for new Projects in Other Settings) couldn't solve the issue. Finally, I imported it (and only it) from a fresh installation.
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