Fix CCE with Map parameterized types

Fixes: #25073

integration-tests/test-extension/tests/src/test/java/io/quarkus/it/extension/ParamsTest.java

@@ -133,4 +133,36 @@ static Stream<Map.Entry<String, String>> testStreamOfMapEntryArguments() {
     static class TestData {
         final List<String> foo = Arrays.asList("one", "two", "three");
     }
+
+    static Stream<Arguments> arguments() {
+        return Stream.of(
+                Arguments.of(new TestObject1()),
+                Arguments.of(new TestObject2()));
+    }
+
+    @ParameterizedTest
+    @MethodSource("arguments")
+    void map(Object o) {
+
+    }
+
+    static class TestObject1 {
+
+        private final Map<String, String> map = Collections.emptyMap();
+
+        Map<String, String> getMap() {
+            return map;
+        }
+
+    }
+
+    static class TestObject2 {
+
+        private final Map<String, String> map = Map.of();
+
+        Map<String, String> getMap() {
+            return map;
+        }
+
+    }
 }

test-framework/junit5/src/main/java/io/quarkus/test/junit/internal/CustomMapConverter.java

@@ -5,7 +5,7 @@
 import java.util.Map;
 import java.util.Set;
 
-import com.thoughtworks.xstream.converters.collections.CollectionConverter;
+import com.thoughtworks.xstream.converters.collections.MapConverter;
 import com.thoughtworks.xstream.mapper.Mapper;
 
 /**
@@ -16,7 +16,7 @@
  * The reason for doing this is to avoid XStream causing illegal access issues
  * for internal JDK maps
  */
-public class CustomMapConverter extends CollectionConverter {
+public class CustomMapConverter extends MapConverter {
 
     // if we wanted to be 100% sure, we'd list all the Set.of methods, but I think it's pretty safe to say
     // that the JDK won't add custom implementations for the other classes