allow dfa inspection to treat all non-annotated members as nullable (IDEA-129898)

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

@@ -0,0 +1,22 @@
+import org.jetbrains.annotations.NotNull;
+
+class Test {
+  Object o;
+
+  void field() {
+    <warning descr="Method invocation 'o.hashCode()' may produce 'java.lang.NullPointerException'">o.hashCode()</warning>;
+  }
+
+  void callUnknownMethod() {
+    <warning descr="Method invocation 'unknownObject().hashCode()' may produce 'java.lang.NullPointerException'">unknownObject().hashCode()</warning>;
+  }
+
+  void callNotNullMethod() {
+    knownObject().hashCode();
+  }
+
+  native Object unknownObject();
+
+  @NotNull
+  native Object knownObject();
+}

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

@@ -137,6 +137,13 @@ public class DataFlowInspectionTest extends LightCodeInsightFixtureTestCase {
     myFixture.testHighlighting(true, false, true, getTestName(false) + ".java");
   }
 
+  public void testParanoidMode() {
+    final DataFlowInspection inspection = new DataFlowInspection();
+    inspection.TREAT_UNKNOWN_MEMBERS_AS_NULLABLE = true;
+    myFixture.enableInspections(inspection);
+    myFixture.testHighlighting(true, false, true, getTestName(false) + ".java");
+  }
+
   public void testReportConstantReferences() {
     doTestReportConstantReferences();
     myFixture.launchAction(myFixture.findSingleIntention("Replace with 'null'"));