backport test for #1456

src/test/java/com/fasterxml/jackson/failing/GenericParameterTypeFactory1456Test.java

@@ -0,0 +1,45 @@
+package com.fasterxml.jackson.failing;
+
+import java.lang.reflect.Method;
+import java.lang.reflect.Type;
+
+import com.fasterxml.jackson.databind.*;
+import com.fasterxml.jackson.databind.introspect.AnnotatedClass;
+import com.fasterxml.jackson.databind.introspect.AnnotatedMethod;
+import com.fasterxml.jackson.databind.introspect.AnnotatedParameter;
+
+public class GenericParameterTypeFactory1456Test extends BaseMapTest
+{
+    public static class BaseController<Entity extends BaseEntity> {
+        public void process(Entity entity) {}
+    }
+
+    public static class ImplController extends BaseController<ImplEntity> {}
+
+    public static class BaseEntity {}
+
+    public static class ImplEntity extends BaseEntity {}
+
+    private final ObjectMapper MAPPER = new ObjectMapper();
+
+    public void testGenericParameterDirect() throws Exception
+    {
+        Method proceed = BaseController.class.getMethod("process", BaseEntity.class);
+        Type entityType = proceed.getGenericParameterTypes()[0];
+
+        JavaType resolvedType = MAPPER.getTypeFactory().constructType(entityType, ImplController.class);
+        assertEquals(ImplEntity.class, resolvedType.getRawClass());
+    }
+
+    public void testGenericParameterViaClass() throws Exception
+    {
+        BeanDescription desc = MAPPER.getDeserializationConfig().introspect(
+                MAPPER.constructType(ImplController.class));
+        AnnotatedClass ac = desc.getClassInfo();
+        AnnotatedMethod m = ac.findMethod("process", new Class<?>[] { BaseEntity.class });
+        assertNotNull(m);
+        assertEquals(1, m.getParameterCount());
+        AnnotatedParameter param = m.getParameter(0);
+        assertEquals(ImplEntity.class, param.getType().getRawClass());
+    }
+}