Add a failing test for #3241

Author: cowtowncoder

src/test/java/com/fasterxml/jackson/failing/ConstructorDetector3241Test.java

@@ -0,0 +1,80 @@
+package com.fasterxml.jackson.failing;
+
+import java.lang.annotation.*;
+
+import com.fasterxml.jackson.annotation.JsonSetter;
+import com.fasterxml.jackson.annotation.Nulls;
+
+import com.fasterxml.jackson.databind.*;
+import com.fasterxml.jackson.databind.cfg.*;
+import com.fasterxml.jackson.databind.exc.InvalidNullException;
+import com.fasterxml.jackson.databind.introspect.AnnotatedMember;
+import com.fasterxml.jackson.databind.introspect.JacksonAnnotationIntrospector;
+import com.fasterxml.jackson.databind.json.JsonMapper;
+
+// Tests for [databind#1498] (Jackson 2.12)
+public class ConstructorDetector3241Test extends BaseMapTest
+{
+    // Helper annotation to work around lack of implicit name access with Jackson 2.x
+    @Target(ElementType.PARAMETER)
+    @Retention(RetentionPolicy.RUNTIME)
+    @interface ImplicitName {
+        String value();
+    }
+
+    // And annotation introspector to make use of it
+    @SuppressWarnings("serial")
+    static class CtorNameIntrospector extends JacksonAnnotationIntrospector
+    {
+        @Override
+        public String findImplicitPropertyName(//MapperConfig<?> config,
+                AnnotatedMember member) {
+            final ImplicitName ann = member.getAnnotation(ImplicitName.class);
+            return (ann == null) ? null : ann.value();
+        }
+    }
+
+    // [databind#3241]
+    static class Input3241 {
+        private final Boolean field;
+
+        // @JsonCreator gone!
+        public Input3241(@ImplicitName("field") Boolean field) {
+            if (field == null) {
+                throw new NullPointerException("Should not get here!");
+            }
+            this.field = field;
+        }
+
+        public Boolean field() {
+          return field;
+        }
+    }
+
+    // [databind#3241]
+    public void testNullHandlingCreator3241() throws Exception
+    {
+        ObjectMapper mapper = mapperBuilder()
+                .constructorDetector(ConstructorDetector.USE_PROPERTIES_BASED) // new!
+                .defaultSetterInfo(JsonSetter.Value.construct(Nulls.FAIL, Nulls.FAIL))
+                .build();
+
+        try {
+            mapper.readValue("{ \"field\": null }", Input3241.class);
+            fail("InvalidNullException expected");
+        } catch (InvalidNullException e) {
+            verifyException(e, "Invalid `null` value encountered");
+        }
+    }
+
+    /*
+    /**********************************************************************
+    /* Helper methods
+    /**********************************************************************
+     */
+
+    private JsonMapper.Builder mapperBuilder() {
+        return JsonMapper.builder()
+                .annotationIntrospector(new CtorNameIntrospector());
+    }
+}