[JAVA] What to do when Maven says "For more information, please recompile with the -Xlint: unchecked option"

"For more information, please recompile with the -Xlint: unchecked option"

$ mvn compile
(Omission)
[WARNING] /Users/az/app/src/main/java/MyApp.java: /Users/az/app/src/main/java/MyApp.Java operations are unchecked or unsafe.
[WARNING] /Users/az/app/src/main/java/MyApp.java:Detail is,-Xlint:Recompile with the unchecked option.

Workaround

Add the Compiler Plugin settings to the plugins element of pom.xml as follows.

<plugin>
  <groupId>org.apache.maven.plugins</groupId>
  <artifactId>maven-compiler-plugin</artifactId>
  <version>3.8.1</version>
  <configuration>
    <compilerArgs>
      <arg>-Xlint:unchecked</arg>
    </compilerArgs>
  </configuration>
</plugin>

Now the specific warning content will be displayed.

[WARNING] /Users/az/app/src/main/java/MyApp.java:[50,17]raw type java.util.Put as a member of Map(K,V)It is an unchecked call to
[WARNING] /Users/az/app/src/main/java/MyApp.java:[53,12]Unchecked conversion
Expected value: java.util.Map<java.lang.String,java.lang.Object>
Detected value:    java.util.Map

This environment

• Apache Maven 3.6.2
• OpenJDK 11.0.2

Reference material

• Apache Maven Compiler Plugin – Introduction
• Maven Repository: org.apache.maven.plugins » maven-compiler-plugin