diff --git a/extensions/resteasy-reactive/quarkus-resteasy-reactive-jackson/deployment/src/test/java/io/quarkus/resteasy/reactive/jackson/deployment/test/DataItem.java b/extensions/resteasy-reactive/quarkus-resteasy-reactive-jackson/deployment/src/test/java/io/quarkus/resteasy/reactive/jackson/deployment/test/DataItem.java
new file mode 100644
index 00000000000000..83c660300629ff
--- /dev/null
+++ b/extensions/resteasy-reactive/quarkus-resteasy-reactive-jackson/deployment/src/test/java/io/quarkus/resteasy/reactive/jackson/deployment/test/DataItem.java
@@ -0,0 +1,14 @@
+package io.quarkus.resteasy.reactive.jackson.deployment.test;
+
+public class DataItem<T> {
+
+    private T content;
+
+    public T getContent() {
+        return content;
+    }
+
+    public void setContent(T content) {
+        this.content = content;
+    }
+}
diff --git a/extensions/resteasy-reactive/quarkus-resteasy-reactive-jackson/deployment/src/test/java/io/quarkus/resteasy/reactive/jackson/deployment/test/Item.java b/extensions/resteasy-reactive/quarkus-resteasy-reactive-jackson/deployment/src/test/java/io/quarkus/resteasy/reactive/jackson/deployment/test/Item.java
new file mode 100644
index 00000000000000..1d43c516a98938
--- /dev/null
+++ b/extensions/resteasy-reactive/quarkus-resteasy-reactive-jackson/deployment/src/test/java/io/quarkus/resteasy/reactive/jackson/deployment/test/Item.java
@@ -0,0 +1,23 @@
+package io.quarkus.resteasy.reactive.jackson.deployment.test;
+
+public class Item {
+
+    private String name;
+    private String email;
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getEmail() {
+        return email;
+    }
+
+    public void setEmail(String email) {
+        this.email = email;
+    }
+}
diff --git a/extensions/resteasy-reactive/quarkus-resteasy-reactive-jackson/deployment/src/test/java/io/quarkus/resteasy/reactive/jackson/deployment/test/SimpleJsonResource.java b/extensions/resteasy-reactive/quarkus-resteasy-reactive-jackson/deployment/src/test/java/io/quarkus/resteasy/reactive/jackson/deployment/test/SimpleJsonResource.java
index 9df7219b1292a6..0a03af52e09a4a 100644
--- a/extensions/resteasy-reactive/quarkus-resteasy-reactive-jackson/deployment/src/test/java/io/quarkus/resteasy/reactive/jackson/deployment/test/SimpleJsonResource.java
+++ b/extensions/resteasy-reactive/quarkus-resteasy-reactive-jackson/deployment/src/test/java/io/quarkus/resteasy/reactive/jackson/deployment/test/SimpleJsonResource.java
@@ -235,6 +235,12 @@ public Multi<Person> getMulti0() {
         return Multi.createFrom().empty();
     }
 
+    @POST
+    @Path("/genericInput")
+    public String genericInputTest(DataItem<Item> item) {
+        return item.getContent().getName();
+    }
+
     public static class UnquotedFieldsPersonBiFunction implements BiFunction<ObjectMapper, Type, ObjectWriter> {
 
         public static final AtomicInteger count = new AtomicInteger();
diff --git a/extensions/resteasy-reactive/quarkus-resteasy-reactive-jackson/deployment/src/test/java/io/quarkus/resteasy/reactive/jackson/deployment/test/SimpleJsonTest.java b/extensions/resteasy-reactive/quarkus-resteasy-reactive-jackson/deployment/src/test/java/io/quarkus/resteasy/reactive/jackson/deployment/test/SimpleJsonTest.java
index 493650f4034f98..83bc00d3b309fd 100644
--- a/extensions/resteasy-reactive/quarkus-resteasy-reactive-jackson/deployment/src/test/java/io/quarkus/resteasy/reactive/jackson/deployment/test/SimpleJsonTest.java
+++ b/extensions/resteasy-reactive/quarkus-resteasy-reactive-jackson/deployment/src/test/java/io/quarkus/resteasy/reactive/jackson/deployment/test/SimpleJsonTest.java
@@ -1,6 +1,7 @@
 package io.quarkus.resteasy.reactive.jackson.deployment.test;
 
 import static org.hamcrest.Matchers.containsString;
+import static org.hamcrest.Matchers.is;
 import static org.hamcrest.Matchers.not;
 import static org.hamcrest.Matchers.notNullValue;
 import static org.hamcrest.Matchers.nullValue;
@@ -26,6 +27,7 @@ public class SimpleJsonTest {
                 public JavaArchive get() {
                     return ShrinkWrap.create(JavaArchive.class)
                             .addClasses(Person.class, SimpleJsonResource.class, User.class, Views.class, SuperClass.class,
+                                    DataItem.class, Item.class,
                                     NoopReaderInterceptor.class);
                 }
             });
@@ -293,4 +295,17 @@ public void testCustomSerialization() {
         // a new instance should have been created
         assertEquals(3, SimpleJsonResource.UnquotedFieldsPersonBiFunction.count.intValue());
     }
+
+    @Test
+    public void testGenericInput() {
+        RestAssured
+                .with()
+                .body("{\"content\": {\"name\":\"foo\", \"email\":\"bar\"}}")
+                .contentType("application/json; charset=utf-8")
+                .post("/simple/genericInput")
+                .then()
+                .statusCode(200)
+                .contentType("text/plain")
+                .body(is("foo"));
+    }
 }
diff --git a/extensions/resteasy-reactive/quarkus-resteasy-reactive-jsonb/deployment/src/test/java/io/quarkus/resteasy/reactive/jsonb/deployment/test/DataItem.java b/extensions/resteasy-reactive/quarkus-resteasy-reactive-jsonb/deployment/src/test/java/io/quarkus/resteasy/reactive/jsonb/deployment/test/DataItem.java
new file mode 100644
index 00000000000000..80710dff681d6f
--- /dev/null
+++ b/extensions/resteasy-reactive/quarkus-resteasy-reactive-jsonb/deployment/src/test/java/io/quarkus/resteasy/reactive/jsonb/deployment/test/DataItem.java
@@ -0,0 +1,14 @@
+package io.quarkus.resteasy.reactive.jsonb.deployment.test;
+
+public class DataItem<T> {
+
+    private T content;
+
+    public T getContent() {
+        return content;
+    }
+
+    public void setContent(T content) {
+        this.content = content;
+    }
+}
diff --git a/extensions/resteasy-reactive/quarkus-resteasy-reactive-jsonb/deployment/src/test/java/io/quarkus/resteasy/reactive/jsonb/deployment/test/Item.java b/extensions/resteasy-reactive/quarkus-resteasy-reactive-jsonb/deployment/src/test/java/io/quarkus/resteasy/reactive/jsonb/deployment/test/Item.java
new file mode 100644
index 00000000000000..6e7db280ba19f2
--- /dev/null
+++ b/extensions/resteasy-reactive/quarkus-resteasy-reactive-jsonb/deployment/src/test/java/io/quarkus/resteasy/reactive/jsonb/deployment/test/Item.java
@@ -0,0 +1,23 @@
+package io.quarkus.resteasy.reactive.jsonb.deployment.test;
+
+public class Item {
+
+    private String name;
+    private String email;
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getEmail() {
+        return email;
+    }
+
+    public void setEmail(String email) {
+        this.email = email;
+    }
+}
diff --git a/extensions/resteasy-reactive/quarkus-resteasy-reactive-jsonb/deployment/src/test/java/io/quarkus/resteasy/reactive/jsonb/deployment/test/SimpleJsonResource.java b/extensions/resteasy-reactive/quarkus-resteasy-reactive-jsonb/deployment/src/test/java/io/quarkus/resteasy/reactive/jsonb/deployment/test/SimpleJsonResource.java
index 63b61561e6bd84..991dfa0548b737 100644
--- a/extensions/resteasy-reactive/quarkus-resteasy-reactive-jsonb/deployment/src/test/java/io/quarkus/resteasy/reactive/jsonb/deployment/test/SimpleJsonResource.java
+++ b/extensions/resteasy-reactive/quarkus-resteasy-reactive-jsonb/deployment/src/test/java/io/quarkus/resteasy/reactive/jsonb/deployment/test/SimpleJsonResource.java
@@ -167,4 +167,10 @@ public Multi<Person> getMulti2() {
     public Multi<Person> getMulti0() {
         return Multi.createFrom().empty();
     }
+
+    @POST
+    @Path("/genericInput")
+    public String genericInputTest(DataItem<Item> item) {
+        return item.getContent().getName();
+    }
 }
diff --git a/extensions/resteasy-reactive/quarkus-resteasy-reactive-jsonb/deployment/src/test/java/io/quarkus/resteasy/reactive/jsonb/deployment/test/SimpleJsonTest.java b/extensions/resteasy-reactive/quarkus-resteasy-reactive-jsonb/deployment/src/test/java/io/quarkus/resteasy/reactive/jsonb/deployment/test/SimpleJsonTest.java
index 2a2bfc677e0520..9337212cb9509f 100644
--- a/extensions/resteasy-reactive/quarkus-resteasy-reactive-jsonb/deployment/src/test/java/io/quarkus/resteasy/reactive/jsonb/deployment/test/SimpleJsonTest.java
+++ b/extensions/resteasy-reactive/quarkus-resteasy-reactive-jsonb/deployment/src/test/java/io/quarkus/resteasy/reactive/jsonb/deployment/test/SimpleJsonTest.java
@@ -1,5 +1,6 @@
 package io.quarkus.resteasy.reactive.jsonb.deployment.test;
 
+import static org.hamcrest.Matchers.is;
 import static org.hamcrest.Matchers.notNullValue;
 import static org.hamcrest.Matchers.nullValue;
 
@@ -22,7 +23,7 @@ public class SimpleJsonTest {
                 @Override
                 public JavaArchive get() {
                     return ShrinkWrap.create(JavaArchive.class)
-                            .addClasses(Person.class, SimpleJsonResource.class, SuperClass.class);
+                            .addClasses(Person.class, SimpleJsonResource.class, SuperClass.class, DataItem.class, Item.class);
                 }
             });
 
@@ -200,4 +201,17 @@ public void testJsonMulti() {
                 .contentType("application/json")
                 .body(Matchers.equalTo("[]"));
     }
+
+    @Test
+    public void testGenericInput() {
+        RestAssured
+                .with()
+                .body("{\"content\": {\"name\":\"foo\", \"email\":\"bar\"}}")
+                .contentType("application/json; charset=utf-8")
+                .post("/simple/genericInput")
+                .then()
+                .statusCode(200)
+                .contentType("text/plain")
+                .body(is("foo"));
+    }
 }
diff --git a/independent-projects/resteasy-reactive/common/processor/src/main/java/org/jboss/resteasy/reactive/common/processor/EndpointIndexer.java b/independent-projects/resteasy-reactive/common/processor/src/main/java/org/jboss/resteasy/reactive/common/processor/EndpointIndexer.java
index 2552f813d50bd5..d6b0cf16204cc9 100644
--- a/independent-projects/resteasy-reactive/common/processor/src/main/java/org/jboss/resteasy/reactive/common/processor/EndpointIndexer.java
+++ b/independent-projects/resteasy-reactive/common/processor/src/main/java/org/jboss/resteasy/reactive/common/processor/EndpointIndexer.java
@@ -945,6 +945,9 @@ && isContextType(paramType.asClassType())) {
                 builder.setOptional(true);
             } else if (convertible) {
                 throw new RuntimeException("Invalid parameter type '" + pt + "' used on method " + errorLocation);
+            } else {
+                elementType = toClassName(pt.arguments().get(0), currentClassInfo, actualEndpointInfo, index);
+                typeHandled = true;
             }
         } else if ((paramType.name().equals(PATH_SEGMENT)) && (type == ParameterType.PATH)) {
             elementType = paramType.name().toString();