Maven: Source option 5 is no longer supported. Use 7 or later.

Source option 5 is no longer supported. Use 7 or later. comes from javac, called by Maven's compiler plugin: the build asked for Java 5 source level, which current JDKs cannot produce. Old versions of maven-compiler-plugin default to source and target 1.5 when the POM does not say otherwise. Set the Java version explicitly in pom.xml:

<properties>
  <maven.compiler.release>17</maven.compiler.release>
</properties>

In Maven's output the message appears as [ERROR] Source option 5 is no longer supported. Use 7 or later. (newer JDKs say Use 8 or later.), followed by the same line for the target option.

Reproduce it with javac

The message is javac's own, so javac with the same options produces it (JDK 17 here):

cat > App.java <<'EOF'
public class App { public static void main(String[] args) { System.out.println("ok"); } }
EOF
javac -source 5 -target 5 App.java

warning: [options] bootstrap class path not set in conjunction with -source 5
error: Source option 5 is no longer supported. Use 7 or later.
error: Target option 5 is no longer supported. Use 7 or later.

The lowest level a JDK accepts depends on its version, so the suggested minimum (Use 7 or later, Use 8 or later) changes with the JDK running Maven. The fix is the same: target a supported version.

cat > App.java <<'EOF'
public class App { public static void main(String[] args) { System.out.println("ok"); } }
EOF
javac --release 17 App.java && java App

ok

Fix in pom.xml

Also pin a current plugin version so the defaults of very old versions are not used:

<build>
  <plugins>
    <plugin>
      <groupId>org.apache.maven.plugins</groupId>
      <artifactId>maven-compiler-plugin</artifactId>
      <version>3.13.0</version>
    </plugin>
  </plugins>
</build>