False negative for RC_REF_COMPARISON

[harrisric]

I'm not sure if it is the intention of the RC_REF_COMPARISON bug detector to pick up all cases of reference comparison but the following very simple examples are not caught.

import java.time.LocalDate;

public class RefComparisonTestClass {

  private final LocalDate date1 = LocalDate.now();

  public boolean isSameDate(LocalDate date2) {
    return date1 == date2;
  }

  public void logIfSameDate(LocalDate date2) {
    if (date1 != date2) {
      System.out.println("Dates not the same [" + date1 + "], [" + date2 +"]");
    }
  }

}

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[harrisric]

Apologies - I have found that this can be picked up by an undocumented configuration option.

      <plugin>
        <groupId>com.github.spotbugs</groupId>
        <artifactId>spotbugs-maven-plugin</artifactId>
        <version>4.7.3.0</version>
        <configuration>
...
          <systemPropertyVariables> 
            <frc.suspicious>java.time.LocalDate</frc.suspicious>
          </systemPropertyVariables>
        </configuration>

It would be good if the documentation could be improved to include this information. Happy to help if this is something I can do.

[Iuliia Sokhranna]

Hello All, I’ll be happy to pick it up and make corresponding changes in documentation

[Jeremy Landis]

Closing as a documentation issue resolved now with #2537