Replace ModulesUtil in test

src/test/java/org/eclipse/yasson/internal/model/ModulesUtil.java

@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2021 Oracle and/or its affiliates. All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v. 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0,
+ * or the Eclipse Distribution License v. 1.0 which is available at
+ * http://www.eclipse.org/org/documents/edl-v10.php.
+ *
+ * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
+ */
+
+package org.eclipse.yasson.internal.model;
+
+import java.lang.invoke.MethodHandles;
+
+/**
+ * Why is this class here?.
+ *
+ * This class is here to replace existing classes in test-runtime:
+ * - src/main/java/org/eclipse/yasson/internal/model/ModulesUtil.java
+ * - src/main/java9/org/eclipse/yasson/internal/model/ModulesUtil.java
+ *
+ * When tests are executed with maven-surefire-plugin the content of
+ * 'classes' is in a different module-path than 'test-classes'.
+ *
+ * This causes the MethodHandles#publicLookup to fail. The reason is that
+ * test classes to serialize/deserialize are coming from module 'test-classes'
+ * and the module 'classes' has no access to it. The 'publicLookup' makes some
+ * validations and because of this different modules, it fails.
+ *
+ * It should work if 'classes' and 'test-classes' are merged in one unique module.
+ *
+ */
+class ModulesUtil {
+
+    private ModulesUtil() {
+    }
+
+    static MethodHandles.Lookup lookup(){
+        return MethodHandles.lookup();
+    }
+}