Add JPA AttributeConverter for Java's Year.

See spring-attic/spring-native#827 and https://hibernate.atlassian.net/browse/HHH-10558 for details.

Author: odrotbohm

server/src/main/java/org/springsource/restbucks/core/YearAttributeConverter.java

@@ -0,0 +1,45 @@
+/*
+ * Copyright 2021 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springsource.restbucks.core;
+
+import java.time.Year;
+
+import javax.persistence.AttributeConverter;
+import javax.persistence.Converter;
+
+import org.hibernate.annotations.Immutable;
+
+/**
+ * JPA {@link AttributeConverter} implementation to map {@link Year} to an {@link Integer} to avoid Hibernates
+ * serializable type handling kick in.
+ *
+ * @author Oliver Drotbohm
+ * @see https://hibernate.atlassian.net/browse/HHH-10558
+ */
+@Immutable
+@Converter(autoApply = true)
+public class YearAttributeConverter implements AttributeConverter<Year, Integer> {
+
+	@Override
+	public Integer convertToDatabaseColumn(Year year) {
+		return year == null ? null : year.getValue();
+	}
+
+	@Override
+	public Year convertToEntityAttribute(Integer source) {
+		return source == null ? null : Year.of(source.intValue());
+	}
+}