Why Maven uses JDK 1.6 but my java -version is 1.7

Step-by-step guide to JDK illumination!

Step 1: Inquire about Maven's JDK preference

Before altering any settings, check your Maven's JVM configuration using mvn -v. The console will humblebrag about its current JDK. If it's stuck in the past, let's move it forward!

Step 2: Mentor Maven with JAVA_HOME and POM.xml

Update your JAVA_HOME value

Broadly address JAVA_HOME on your operating system:

• Windows users, march through System Properties > Environment Variables.
• Mac/Linux users, adjust in your bash profile or bashrc.

Broaden Maven's horizon in POM.xml

Now, ambushing your POM.xml, update the maven-compiler-plugin:

<build>
  <plugins>
    <!-- Maven citing plugin, because everybody needs a mentor! -->
    <plugin>
      <groupId>org.apache.maven.plugins</groupId>
      <artifactId>maven-compiler-plugin</artifactId>
      <version>3.x.x</version>
      <configuration>
        <!-- Maven, it's 1.7, not 1.6! Caveat, it doesn't understand 'latest' 😜 -->
        <source>1.7</source>
        <target>1.7</target>
      </configuration>
    </plugin>
  </plugins>
</build>
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Streamline IDE for smooth sailing

If you're an ideal citizen using an IDE, ensure the athlon of tools within the IDE are aligned with JDK 1.7, fostering consistency across your environment.

Step 3: Dealing with Tennant-sized Time Lords

Handling mischievous JDK discrepancies

After all efforts, Maven keeps clinging onto an old JDK?! Check for hidden profiles in your POM or renegade environment variables that outrageously think they know better.

Checking system's JAVA_HOME during runtime

For macOS and Linux users, inspect the CurrentJDK symbolic link or shake up the alternatives system for all possible culprits.

Step 4: A jubilant recheck

In the race against time, triumph by re-running mvn -v to witness your correct JDK being honored.

A diligent guide to JDK 1.7 adoption

Overcoming obstacles

Despite all your efforts, if the problem remains insoluble, embrace the open-source community or the Maven documentation for exquisite diagnostics.

Forward compatibility - A compatibility tale

Before you seal the JDK decision, cross-examine your dependencies and plugins for compatibility with JDK 1.7, avoiding unforeseen runtime or build issues.