invert boolean: ensure to invert default boolean initializer (IDEA-123510)

java/java-impl/src/com/intellij/refactoring/invertBoolean/InvertBooleanProcessor.java

@@ -271,6 +271,10 @@ public class InvertBooleanProcessor extends BaseRefactoringProcessor {
         }
       }
     }
+
+    if (myElement instanceof PsiField && ((PsiField)myElement).getInitializer() == null) {
+      ((PsiField)myElement).setInitializer(JavaPsiFacade.getElementFactory(myProject).createExpressionFromText("true", myElement));
+    }
   }
 
   @Override

java/java-tests/testData/refactoring/invertBoolean/BooleanFieldWithoutInitializer.java

@@ -0,0 +1,10 @@
+class Test {
+  private boolean notInitial<caret>ized;
+
+  public void foo() {
+    if (notInitialized) {
+      notInitialized = false;
+    }
+  }
+
+}

java/java-tests/testData/refactoring/invertBoolean/BooleanFieldWithoutInitializer_after.java

@@ -0,0 +1,10 @@
+class Test {
+  private boolean notInitializedInverted = true;
+
+  public void foo() {
+    if (!notInitializedInverted) {
+      notInitializedInverted = true;
+    }
+  }
+
+}