[java, inspection] make global unused symbol inspection not report main methods for unnamed classes IDEA-333152

GitOrigin-RevId: 597ef591bebf0ee6968e08a05dd989aadc8bdd53

java/java-analysis-impl/src/com/intellij/codeInspection/reference/RefMethodImpl.java

@@ -97,9 +97,7 @@ public class RefMethodImpl extends RefJavaElementImpl implements RefMethod {
       setAbstract(javaPsi.hasModifierProperty(PsiModifier.ABSTRACT));
 
       setLibraryOverride(javaPsi.hasModifierProperty(PsiModifier.NATIVE));
-      if (PsiModifier.PUBLIC.equals(getAccessModifier())) {
-        setAppMain(isAppMain(javaPsi, this));
-      }
+      setAppMain(isAppMain(javaPsi, this));
       if (!PsiModifier.PRIVATE.equals(getAccessModifier()) && !isStatic()) {
         initializeSuperMethods(javaPsi);
       }
@@ -125,12 +123,11 @@ public class RefMethodImpl extends RefJavaElementImpl implements RefMethod {
   }
 
   private static boolean isAppMain(PsiMethod psiMethod, RefMethod refMethod) {
+    if (PsiMethodUtil.isMainMethod(psiMethod)) return true;
+
     if (!refMethod.isStatic()) return false;
     if (!PsiTypes.voidType().equals(psiMethod.getReturnType())) return false;
 
-    PsiMethod appMainPattern = ((RefMethodImpl)refMethod).getRefJavaManager().getAppMainPattern();
-    if (MethodSignatureUtil.areSignaturesEqual(psiMethod, appMainPattern)) return true;
-
     if ("main".equals(psiMethod.getName()) && psiMethod.getParameterList().isEmpty() &&
         psiMethod.getLanguage().isKindOf("kotlin")) return true;
 

java/java-tests/testData/inspection/deadCode/unnamedClass/expected.xml

@@ -0,0 +1,2 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<problems/>

java/java-tests/testData/inspection/deadCode/unnamedClass/src/Main.java

@@ -0,0 +1 @@
+void main() {}

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

@@ -277,6 +277,12 @@ public class UnusedDeclarationInspectionTest extends AbstractUnusedDeclarationTe
 
   public void testJunitMethodSource() {doTest();}
 
+  public void testUnnamedClass() {
+    IdeaTestUtil.withLevel(getModule(), LanguageLevel.JDK_21_PREVIEW, () -> {
+      doTest();
+    });
+  }
+
   private void doTest5() {
     IdeaTestUtil.withLevel(getModule(), LanguageLevel.JDK_1_5, () -> doTest());
   }