Add ArrayList to serialization test

integration-tests/main/src/main/java/io/quarkus/it/corestuff/SerializationTestEndpoint.java

@@ -6,6 +6,8 @@
 import java.io.ObjectInputStream;
 import java.io.ObjectOutputStream;
 import java.io.PrintWriter;
+import java.util.ArrayList;
+import java.util.List;
 
 import javax.servlet.annotation.WebServlet;
 import javax.servlet.http.HttpServlet;
@@ -42,14 +44,16 @@ private void reflectiveSetterInvoke(HttpServletResponse resp) throws IOException
             ExternalizablePerson ep = new ExternalizablePerson();
             ep.setName("Sheldon 2.0");
             instance.setExternalizablePerson(ep);
+            instance.setList(new ArrayList<>(List.of("Hello World!")));
             ByteArrayOutputStream out = new ByteArrayOutputStream();
             ObjectOutputStream os = new ObjectOutputStream(out);
             os.writeObject(instance);
             ByteArrayInputStream bais = new ByteArrayInputStream(out.toByteArray());
             ObjectInputStream is = new ObjectInputStream(bais);
             SomeSerializationObject result = (SomeSerializationObject) is.readObject();
             if (result.getPerson().getName().equals("Sheldon")
-                    && result.getExternalizablePerson().getName().equals("Sheldon 2.0")) {
+                    && result.getExternalizablePerson().getName().equals("Sheldon 2.0")
+                    && result.getList().toString().equals("[Hello World!]")) {
                 resp.getWriter().write("OK");
             } else {
                 reportException("Serialized output differs from input", null, resp);

integration-tests/main/src/main/java/io/quarkus/it/corestuff/serialization/SerializationConfig.java

@@ -1,8 +1,11 @@
 package io.quarkus.it.corestuff.serialization;
 
+import java.util.ArrayList;
+import java.util.List;
+
 import io.quarkus.runtime.annotations.RegisterForReflection;
 
-@RegisterForReflection(targets = String.class, serialization = true)
+@RegisterForReflection(targets = { List.class, ArrayList.class, String.class }, serialization = true)
 public class SerializationConfig {
 
 }

integration-tests/main/src/main/java/io/quarkus/it/corestuff/serialization/SomeSerializationObject.java

@@ -1,6 +1,7 @@
 package io.quarkus.it.corestuff.serialization;
 
 import java.io.Serializable;
+import java.util.List;
 
 import io.quarkus.runtime.annotations.RegisterForReflection;
 
@@ -9,6 +10,7 @@ public class SomeSerializationObject implements Serializable {
 
     private Person person;
     private ExternalizablePerson externalizablePerson;
+    private List<String> list;
 
     public Person getPerson() {
         return person;
@@ -25,4 +27,12 @@ public ExternalizablePerson getExternalizablePerson() {
     public void setExternalizablePerson(ExternalizablePerson externalizablePerson) {
         this.externalizablePerson = externalizablePerson;
     }
+
+    public List<String> getList() {
+        return list;
+    }
+
+    public void setList(List<String> list) {
+        this.list = list;
+    }
 }