Still getting NP_NULL_ON_SOME_PATH_FROM_RETURN_VALUE with Objects.requireNonNull

[cristalp]

I have read the issues regarding Objects.requireNonNull, so I expected the following to show no errors (using Spotbugs Maven plugin 4.8.4.0 with Spotbugs 4.8.4).

package foobar;

import java.util.Objects;
import java.util.function.Supplier;

import javax.annotation.CheckForNull;
import javax.annotation.Nullable;

public class SpotBugsTest {

  public void foo() {
    final String foo = getString("foo");
    Objects.requireNonNull(foo);
  }

  public void bar() {
    final String bar = getString("bar");
    Objects.requireNonNull(bar, "Bar must not be null");
  }

  public void baz() {
    final Supplier<String> supplier = ()-> "Baz must not be null";
    final String baz = getString("baz");
    Objects.requireNonNull(baz, supplier);
  }

  @CheckForNull
  private String getString(@Nullable final String text) {
    return text == null ? null : text;
  }
}

However, I get Spotbugs errors for all three cases.

    <BugInstance type='NP_NULL_ON_SOME_PATH_FROM_RETURN_VALUE' priority='Normal' category='STYLE' message='Possible null pointer dereference in ch.ipi.schutztitel.bo.SpotBugsTest.bar() due to return value of called method' lineNumber='18' />
    <BugInstance type='NP_NULL_ON_SOME_PATH_FROM_RETURN_VALUE' priority='Normal' category='STYLE' message='Possible null pointer dereference in ch.ipi.schutztitel.bo.SpotBugsTest.baz() due to return value of called method' lineNumber='24' />
    <BugInstance type='NP_NULL_ON_SOME_PATH_FROM_RETURN_VALUE' priority='Normal' category='STYLE' message='Possible null pointer dereference in ch.ipi.schutztitel.bo.SpotBugsTest.foo() due to return value of called method' lineNumber='13' />

I thought this was fixed with the issues I read. Am I doing something wrong?

P.S. Thanks a lot for SpotBugs and carrying the load of work!