IDEA-383075 [java-psi] Huge CPU usage after opening a Java class with wildcard generics in a method

GitOrigin-RevId: ed56ac24ce9e113a36e00ffeea765cd68d756d72

Author: amaembo

java/java-psi-impl/src/com/intellij/psi/impl/cache/ExplicitTypeAnnotationContainer.java

@@ -340,6 +340,7 @@ public void accept(@NotNull PsiElementVisitor visitor) {
   private class TypeAnnotationContainerProvider implements TypeAnnotationProvider {
     private final PsiElement myParent;
     private final @Nullable PsiAnnotationOwner myOwner;
+    private final NotNullLazyValue<PsiAnnotation[]> myAnnotations = NotNullLazyValue.createValue(this::computeAnnotations);
 
     private TypeAnnotationContainerProvider(PsiElement parent, @Nullable PsiAnnotationOwner owner) { 
       myParent = parent;
@@ -351,8 +352,7 @@ private TypeAnnotationContainerProvider(PsiElement parent, @Nullable PsiAnnotati
       return new TypeAnnotationContainerProvider(myParent, owner);
     }
 
-    @Override
-    public @NotNull PsiAnnotation @NotNull [] getAnnotations() {
+    private @NotNull PsiAnnotation @NotNull [] computeAnnotations() {
       List<PsiAnnotation> result = new ArrayList<>();
       for (TypeAnnotationEntry entry : myList) {
         if (entry.myPath.length == 0) {
@@ -363,5 +363,10 @@ private TypeAnnotationContainerProvider(PsiElement parent, @Nullable PsiAnnotati
       }
       return result.toArray(PsiAnnotation.EMPTY_ARRAY);
     }
+
+    @Override
+    public @NotNull PsiAnnotation @NotNull [] getAnnotations() {
+      return myAnnotations.getValue();
+    }
   }
 }

java/java-tests/testSrc/com/intellij/java/codeInsight/daemon/lambda/LightGuavaNullabilityHighlightingTest.java

@@ -0,0 +1,43 @@
+// Copyright 2000-2026 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license.
+package com.intellij.java.codeInsight.daemon.lambda;
+
+import com.intellij.idea.TestFor;
+import com.intellij.testFramework.IdeaTestUtil;
+import com.intellij.testFramework.LightProjectDescriptor;
+import com.intellij.testFramework.fixtures.DefaultLightProjectDescriptor;
+import com.intellij.testFramework.fixtures.LightJavaCodeInsightFixtureTestCase;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.List;
+
+public final class LightGuavaNullabilityHighlightingTest extends LightJavaCodeInsightFixtureTestCase {
+  private static final LightProjectDescriptor DESCRIPTOR =
+    new DefaultLightProjectDescriptor(IdeaTestUtil::getMockJdk21, List.of("com.google.guava:guava:33.5.0-jre"));
+
+  @Override
+  protected @NotNull LightProjectDescriptor getProjectDescriptor() {
+    return DESCRIPTOR;
+  }
+  
+  @TestFor(issues = "IDEA-383075")
+  public void testHighlightWithAnnotatedUpperBound() {
+    myFixture.configureByText("Test.java", """
+      import com.google.common.collect.Multimap;
+      
+      class Test {
+        public interface InvocationOnMock {}
+      
+        public interface Answer<T> {
+          T answer(InvocationOnMock invocation) throws Throwable;
+        }
+      
+        private native Multimap<?, String> onInterceptedDaoCallReturningMultimap(InvocationOnMock invocation);
+        public static native Object doAnswer(Answer answer);
+      
+        public void prepareMocks() {
+          doAnswer(this::onInterceptedDaoCallReturningMultimap);
+        }
+      }""");
+    myFixture.checkHighlighting();
+  }
+}