unused declaration: take refs from literals into account (IDEA-172447)

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

@@ -55,6 +55,17 @@ public class RefJavaUtilImpl extends RefJavaUtil{
           }
         }
 
+        @Override
+        public void visitLiteralExpression(PsiLiteralExpression expression) {
+          for (PsiReference reference : expression.getReferences()) {
+            PsiElement resolve = reference.resolve();
+            if (resolve instanceof PsiMember) {
+              final RefElement refClass = refFrom.getRefManager().getReference(resolve);
+              refFrom.addReference(refClass, resolve, psiFrom, false, true, null);
+            }
+          }
+        }
+
         @Override public void visitReferenceExpression(PsiReferenceExpression expression) {
           visitElement(expression);
 

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

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<problems>  
+</problems>
+

java/java-tests/testData/inspection/deadCode/referenceFromReflection/src/Test.java

@@ -0,0 +1,7 @@
+class Util {
+    static void foo() { }
+
+    public static void main(String[] args) throws Throwable {
+        Util.class.getMethod("foo");
+    }
+}

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

@@ -194,4 +194,8 @@ public class UnusedDeclarationTest extends AbstractUnusedDeclarationTest {
   public void testDeprecatedAsEntryPoint() {
     doTest();
   }
+
+  public void testReferenceFromReflection() {
+    doTest();
+  }
 }