[java-property-tests] IDEA-375027 incorrect var type when use var type is enabled

GitOrigin-RevId: a24859428c9fac54a2aa75eb0e82a2ac018114ce

java/java-impl-refactorings/src/com/intellij/refactoring/introduceVariable/JavaVariableInplaceIntroducer.java

@@ -345,7 +345,7 @@ public class JavaVariableInplaceIntroducer extends AbstractJavaInplaceIntroducer
         }
       }
     }
-    if (psiVariable != null && psiVariable.isValid()) {
+    if (psiVariable != null && psiVariable.isValid() && !PsiTypes.nullType().equals(psiVariable.getType())) {
       DumbService.getInstance(project).runWithAlternativeResolveEnabled(() -> createCastInVariableDeclaration(project, psiVariable));
     }
   }

java/java-tests/testData/refactoring/inplaceIntroduceVariable/unresolvedVariable.java

@@ -0,0 +1,11 @@
+
+class Test {
+  void f(Object o) {
+    System.out.println(((SomeUnresolved)o).doSomet<caret>hing());
+  }
+
+  class SomeUnresolved{
+    Test doSomething() {}
+  }
+}
+

java/java-tests/testData/refactoring/inplaceIntroduceVariable/unresolvedVariable_after.java

@@ -0,0 +1,12 @@
+
+class Test {
+  void f(Object o) {
+      var o = ((SomeUnresolved) o).doSomething();
+      System.out.println(o);
+  }
+
+  class SomeUnresolved{
+    Test doSomething() {}
+  }
+}
+

java/java-tests/testSrc/com/intellij/java/refactoring/InplaceIntroduceVariableTest.java

@@ -20,6 +20,7 @@ import com.intellij.psi.codeStyle.JavaCodeStyleSettings;
 import com.intellij.psi.impl.source.tree.injected.InjectedLanguageUtil;
 import com.intellij.psi.util.PsiTreeUtil;
 import com.intellij.refactoring.IntroduceVariableUtil;
+import com.intellij.refactoring.JavaRefactoringSettings;
 import com.intellij.refactoring.introduce.inplace.AbstractInplaceIntroducer;
 import com.intellij.refactoring.introduceVariable.IntroduceVariableHandler;
 import com.intellij.refactoring.util.CommonRefactoringUtil;
@@ -77,6 +78,19 @@ public class InplaceIntroduceVariableTest extends AbstractJavaInplaceIntroduceTe
     doTest(introducer -> type("constants"));
   }
 
+  public void testUnresolvedVariable() {
+    JavaRefactoringSettings instance = JavaRefactoringSettings.getInstance();
+    Boolean oldValue = instance.INTRODUCE_LOCAL_CREATE_VAR_TYPE;
+    instance.INTRODUCE_LOCAL_CREATE_VAR_TYPE = true;
+    try {
+      doTest(introducer -> type("o"));
+    }
+    finally {
+      instance.INTRODUCE_LOCAL_CREATE_VAR_TYPE = oldValue;
+    }
+
+  }
+
   public void testInsideInjectedString() {
     doTestInsideInjection(introducer -> type("expr"));
   }