Error “Source option 5 is no longer supported. Use 6 or later” on Maven compile

Question

I am getting the following error or $ mvn compile:

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on         


        

Answer 1

I had same issue, the problem is with properties. Check your JavaSE version in your project, it will be displayed beside JRE System Library folder in your project. If it is 1.5, then it will throw an error. Most probably you will have a updated version, so check the version and update it. I have updated it below based on your code.

<properties>
   <maven.compiler.source>1.6</maven.compiler.source>
   <maven.compiler.target>1.6</maven.compiler.target>
 </properties>

Answer 2

What helped me was these lines in pom.xml file

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

Answer 3

On MacOS I have multiple versions

user> ls /Library/Java/JavaVirtualMachines/
jdk-11.0.4.jdk      jdk-12.0.2.jdk      jdk1.8.0_221.jdk

and JAVA_HOME was not defined properly so Maven used jdk-12. I have jdk-11,jdk-8, and jdk-12.

user> mvn -version
Apache Maven 3.6.1 
Maven home: /usr/local/Cellar/maven/3.6.1/libexec
Java version: 12.0.2, vendor: Oracle Corporation, runtime: /Library/Java/JavaVirtualMachines/jdk-12.0.2.jdk/Contents/Home
Default locale: XXX, platform encoding: UTF-8
OS name: "mac os x", version: "10.14.6", arch: "x86_64", family: "mac"

So:

Define JAVA_HOME to use jdk-8.

export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_221.jdk/Contents/Home

Try again, now maven is:

user> mvn -version
    Maven home: /usr/local/Cellar/maven/3.6.1/libexec
    Java version: 1.8.0_221, vendor: Oracle Corporation, runtime: /Library/Java/JavaVirtualMachines/jdk1.8.0_221.jdk/Contents/Home/jre

and the build is:

[INFO] BUILD SUCCESS

Answer 4

Also in one of my projects, in addition to all of answers above, another try works: Just change Language level in Modules section of Project Structure [image below] []1

Answer 5

I think you have wrong your pom.xml:

<properties>
   <maven.compiler.source>6</maven.compiler.source>
   <maven.compiler.target>1.6</maven.compiler.target>
 </properties>

change to:

<properties>
   <maven.compiler.source>1.6</maven.compiler.source>
   <maven.compiler.target>1.6</maven.compiler.target>
 </properties>

Now depending if you are using the command line use:

mvn clean compile

or either way(eclipse ide)

Right click on project Run with maven>build>Goal (compile)

Answer 6

I had same issue and i have added below configuration in pom.xml and it works.

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