IDEA-221312 NPE warning on instance-qualified static method call

GitOrigin-RevId: cb7844ba9cb97413161402fb0ff187d0a5ee7922

java/java-analysis-impl/src/com/intellij/codeInspection/dataFlow/NullabilityProblemKind.java

@@ -160,6 +160,10 @@ public class NullabilityProblemKind<T extends PsiElement> {
     }
     PsiElement parent = context.getParent();
     if (parent instanceof PsiReferenceExpression) {
+      PsiElement resolved = ((PsiReferenceExpression)parent).resolve();
+      if (resolved instanceof PsiMember && ((PsiMember)resolved).hasModifierProperty(PsiModifier.STATIC)) {
+        return null;
+      }
       PsiElement grandParent = parent.getParent();
       if (grandParent instanceof PsiMethodCallExpression) {
         return callNPE.problem((PsiMethodCallExpression)grandParent, expression);

java/java-tests/testData/inspection/dataFlow/fixture/InstanceQualifiedStaticMember.java

@@ -0,0 +1,10 @@
+class Null {
+  public static void greet() {
+    System.out.println("Hello World");
+  }
+
+  public static void main(String[] args) {
+    Null null1 = null;
+    null1.greet();
+  }
+}

java/java-tests/testSrc/com/intellij/java/codeInspection/DataFlowInspectionTest.java

@@ -666,4 +666,5 @@ public class DataFlowInspectionTest extends DataFlowInspectionTestCase {
   public void testArrayElementLocality() { doTest(); }
   public void testOverwrittenParameter() { doTest(); }
   public void testClassCastExceptionDispatch() { doTest(); }
+  public void testInstanceQualifiedStaticMember() { doTest(); }
 }