Regression test for databind#4595

src/test/java/com/fasterxml/jackson/dataformat/xml/CustomAnnotationIntrospectorNoWrapperTest.java

@@ -0,0 +1,70 @@
+package com.fasterxml.jackson.dataformat.xml;
+
+import com.fasterxml.jackson.core.Version;
+import com.fasterxml.jackson.databind.AnnotationIntrospector;
+import com.fasterxml.jackson.databind.PropertyName;
+import com.fasterxml.jackson.databind.introspect.Annotated;
+import com.fasterxml.jackson.databind.module.SimpleModule;
+
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.util.Arrays;
+import java.util.List;
+
+/**
+ * A regression test for https://github.com/FasterXML/jackson-databind/issues/4595
+ */
+public class CustomAnnotationIntrospectorNoWrapperTest extends XmlTestBase {
+    private final XmlMapper MAPPER = newMapper();
+
+    public void testNoWrapper() throws Exception {
+        Foo foo = new Foo(Arrays.asList("Value1", "Value2"));
+
+        assertEquals("<Foo><bar><bar>Value1</bar><bar>Value2</bar></bar></Foo>", MAPPER.writeValueAsString(foo));
+
+        MAPPER
+            .registerModule(new SimpleModule("NoWrapperModule") {
+                @Override
+                public void setupModule(SetupContext context) {
+                    context.insertAnnotationIntrospector(new NoWrapperIntrospector());
+                    super.setupModule(context);
+                }
+            });
+
+        // TODO: update after fixing https://github.com/FasterXML/jackson-databind/issues/4595
+        // Should be assertEquals("<Foo><bar>Value1</bar><bar>Value2</bar></Foo>", MAPPER.writeValueAsString(foo));
+        assertEquals("<Foo><bar><bar>Value1</bar><bar>Value2</bar></bar></Foo>", MAPPER.writeValueAsString(foo));
+    }
+
+    public static class Foo {
+        private final List<String> bar;
+
+        public Foo(List<String> bar) {
+            this.bar = bar;
+        }
+
+        @NoWrapper
+        public List<String> getBar() {
+            return bar;
+        }
+    }
+
+    public static class NoWrapperIntrospector extends AnnotationIntrospector {
+        @Override
+        public Version version() {
+            return com.fasterxml.jackson.databind.cfg.PackageVersion.VERSION;
+        }
+
+        @Override
+        public PropertyName findWrapperName(Annotated ann) {
+            if (ann.hasAnnotation(NoWrapper.class)) {
+                return PropertyName.NO_NAME;
+            }
+            return super.findWrapperName(ann);
+        }
+    }
+
+    @Retention(RetentionPolicy.RUNTIME)
+    public @interface NoWrapper {
+    }
+}