test: collection of records and compact constructor

src/test/java/org/eclipse/yasson/records/RecordItem.java

diff --git a/src/test/java/org/eclipse/yasson/records/RecordItem.java b/src/test/java/org/eclipse/yasson/records/RecordItem.java
new file mode 100644
index 0000000..780c946
--- /dev/null
+++ b/src/test/java/org/eclipse/yasson/records/RecordItem.java
@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) 2026 Contributors to the Eclipse Foundation
+ *
+ * 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.records;
+
+import jakarta.json.bind.annotation.JsonbCreator;
+
+/**
+ * Child record used by {@link RecordWithList}.
+ */
+public record RecordItem(String required, String optional) {
+
+    @JsonbCreator
+    public RecordItem {
+    }
+}

src/test/java/org/eclipse/yasson/records/RecordTest.java

diff --git a/src/test/java/org/eclipse/yasson/records/RecordTest.java b/src/test/java/org/eclipse/yasson/records/RecordTest.java
index 813120d..e8998b4 100644
--- a/src/test/java/org/eclipse/yasson/records/RecordTest.java
+++ b/src/test/java/org/eclipse/yasson/records/RecordTest.java
@@ -21,10 +21,13 @@
 import org.eclipse.yasson.internal.properties.Messages;
 import org.junit.jupiter.api.Test;
 
+import java.util.List;
 import java.util.Set;
 
 import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.Matchers.containsString;
+import static org.hamcrest.Matchers.hasSize;
+import static org.hamcrest.Matchers.instanceOf;
 import static org.hamcrest.Matchers.is;
 import static org.hamcrest.Matchers.not;
 import static org.junit.jupiter.api.Assertions.assertEquals;
@@ -237,4 +240,31 @@
         RecordWithTypeAdapter record = Jsonbs.defaultJsonb.fromJson(json, RecordWithTypeAdapter.class);
         assertThat(record.entries(), is(Set.of("a", "b", "c")));
     }
+	
+	/**
+     * Regression test for https://github.com/eclipse-ee4j/yasson/issues/656.
+     * <p>
+     * A record with a {@code List<RecordType>} component and a compact {@code @JsonbCreator}
+     * constructor must deserialize list elements as the declared record type, not as
+     * {@code Map} instances.  This was broken on certain JDK 21 builds due to
+     * JDK bug JDK-8320575 where generic type parameters on compact constructors were
+     * not resolved correctly by reflection.
+     */
+    @Test
+    public void testRecordWithListOfRecordsDeserializesElementsAsRecordType() {
+        String json = "{\"name\":\"parent\",\"items\":[{\"required\":\"a\",\"optional\":\"b\"},{\"required\":\"c\"}]}";
+
+        RecordWithList result = Jsonbs.defaultJsonb.fromJson(json, RecordWithList.class);
+
+        assertThat(result.name(), is("parent"));
+        assertThat(result.items(), hasSize(2));
+        assertThat("list elements must be RecordItem, not Map",
+                   result.items().get(0), instanceOf(RecordItem.class));
+
+        assertThat(result.items().get(0).required(), is("a"));
+        assertThat(result.items().get(0).optional(), is("b"));
+        
+        assertThat(result.items().get(1).required(), is("c"));
+        assertThat(result.items().get(1).optional(), is((String) null));
+    }
 }

src/test/java/org/eclipse/yasson/records/RecordWithList.java

diff --git a/src/test/java/org/eclipse/yasson/records/RecordWithList.java b/src/test/java/org/eclipse/yasson/records/RecordWithList.java
new file mode 100644
index 0000000..713489b
--- /dev/null
+++ b/src/test/java/org/eclipse/yasson/records/RecordWithList.java
@@ -0,0 +1,28 @@
+/*
+ * Copyright (c) 2026 Contributors to the Eclipse Foundation
+ *
+ * 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.records;
+
+import jakarta.json.bind.annotation.JsonbCreator;
+
+import java.util.List;
+
+/**
+ * Reproducer for https://github.com/eclipse-ee4j/yasson/issues/656.
+ * A record with a {@code List} component and a compact {@code @JsonbCreator} constructor.
+ */
+public record RecordWithList(String name, List<RecordItem> items) {
+
+    @JsonbCreator
+    public RecordWithList {
+    }
+}