ReplaceDuplicateStringLiterals throws NPE from 1.19.0+ #384 (#385)

* Add test case for issue #384

#384

* Apply suggestions from code review

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

* Refactor `staticWithObjectArray` test method

* Guard against NPE

---------

Co-authored-by: Tim te Beek <[email protected]>
Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Tim te Beek <[email protected]>

Author: 3 people

src/main/java/org/openrewrite/staticanalysis/ReplaceDuplicateStringLiterals.java

@@ -230,8 +230,9 @@ public J.VariableDeclarations.NamedVariable visitVariable(J.VariableDeclarations
                     boolean privateStaticFinalVariable = isPrivateStaticFinalVariable(variable);
                     // `private static final String`(s) are handled separately by `FindExistingPrivateStaticFinalFields`.
                     if (v.getInitializer() instanceof J.Literal &&
-                        (parentScope.getValue() instanceof J.MethodDeclaration || parentScope.getValue() instanceof J.ClassDeclaration) &&
-                            !(privateStaticFinalVariable && ((J.Literal) v.getInitializer()).getValue() instanceof String)) {
+                            (parentScope.getValue() instanceof J.MethodDeclaration || parentScope.getValue() instanceof J.ClassDeclaration) &&
+                            ((J.Literal) v.getInitializer()).getValue() instanceof String &&
+                            !privateStaticFinalVariable) {
                         String value = (((J.Literal) v.getInitializer()).getValue()).toString();
                         result.existingFieldValueToFieldName.put(v.getSimpleName(), value);
                     }

src/test/java/org/openrewrite/staticanalysis/ReplaceDuplicateStringLiteralsTest.java

@@ -727,4 +727,24 @@ interface A {
           )
         );
     }
+
+    @Issue("https://github.com/openrewrite/rewrite-static-analysis/issues/384")
+    @Test
+    void staticWithObjectArray() {
+        rewriteRun(
+          //language=java
+          java(
+            """
+           class A {
+               public void method() {
+                   Object[] args = null;
+                   args = new Object[] {"value"};
+               }
+           }
+           """
+          )
+        );
+    }
+
+
 }