Maven

Maven and the different JDKs

IF you are using maven for the dependency management, you have to configure the version and language level you want to use.

The maven version itself shuld be 3.5.0 or above.

pom.xml - JDK8

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

or

<project>
  [...]
  <build>
    [...]
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.7.0</version>
        <configuration>
          <source>1.8</source>
          <target>1.8</target>
        </configuration>
      </plugin>
    </plugins>
    [...]
  </build>
  [...]
</project>

pom.xml - JDK9

<project>
  [...]
  <properties>
    <maven.compiler.source>9</maven.compiler.source>
    <maven.compiler.target>9</maven.compiler.target>
  </properties>
  [...]
</project>

or

<project>
  [...]
  <build>
    [...]
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.7.0</version>
        <configuration>
          <source>9</source>
          <target>9</target>
        </configuration>
      </plugin>
    </plugins>
    [...]
  </build>
  [...]
</project>

pom.xml - JDK10

<plugin>
  <groupId>org.apache.maven.plugins</groupId>
  <artifactId>maven-compiler-plugin</artifactId>
  <version>3.7.0</version>
  <configuration>
    <release>10</release>
  </configuration>
  <dependencies>
    <dependency>
      <groupId>org.ow2.asm</groupId>
      <artifactId>asm</artifactId>
      <version>6.1</version> <!-- Use newer version of ASM -->
    </dependency>
  </dependencies>
</plugin>

pom.xml - JDK11

<plugin>
  <groupId>org.apache.maven.plugins</groupId>
  <artifactId>maven-compiler-plugin</artifactId>
  <version>3.7.0</version>
  <configuration>
    <release>11</release>
  </configuration>
  <dependencies>
    <dependency>
      <groupId>org.ow2.asm</groupId>
      <artifactId>asm</artifactId>
      <version>6.1</version> <!-- Use newer version of ASM -->
    </dependency>
  </dependencies>
</plugin>