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Enable application data caching in CDI beans

There is a newer version: 3.17.5

package io.quarkus.cache.runtime;

/**
 * This class is used to allow the storage of {@code null} values in the Quarkus cache while it is forbidden by the underlying
 * caching provider.
 */
public class NullValueConverter {

    private static final class NullValue {
        public static Object INSTANCE = new NullValue();
    }

    public static Object toCacheValue(Object value) {
        return value == null ? NullValue.INSTANCE : value;
    }

    public static Object fromCacheValue(Object value) {
        return value == NullValue.INSTANCE ? null : value;
    }
}