Better set Error Prone's "EqualsIncompatibleType" check to ERROR

Let’s consider the following example:

var list = List.of(1);
var first1 = list.stream().findFirst();
var first2 = list.getFirst();
if (Objects.equals(first1, first2)) { // compiles, just warning in Intellij
	// unrechable
}

It’s hard to spot when using var instead of explicit type. In project, I’m working I found a piece of such bug in prod and test code.

To force fixing such error, we could simply raise Error Prone’s EqualsIncompatibleType bug pattern to ERROR.

Below instruction is from ChatGTP

To set the EqualsIncompatibleType bug pattern to error in Error Prone, update your Maven or Gradle configuration to include the following compiler argument:

-Xep:EqualsIncompatibleType:ERROR

For Maven, add it to the compilerArgs in your pom.xml:

<plugin>
  <groupId>org.apache.maven.plugins</groupId>
  <artifactId>maven-compiler-plugin</artifactId>
  <configuration>
    <compilerArgs>
      <arg>-Xep:EqualsIncompatibleType:ERROR</arg>
    </compilerArgs>
  </configuration>
</plugin>

For Gradle, add it to your build.gradle:

tasks.withType(JavaCompile) {
    options.compilerArgs += ['-Xep:EqualsIncompatibleType:ERROR']
}

This will treat all EqualsIncompatibleType findings as errors during compilation.