General purpose Json Serializer/Deserializer Util

JsonSerializer.java

// jackson 2 => compile 'com.fasterxml.jackson.core:jackson-core:2.6.3'

import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;

import org.codehaus.jackson.map.DeserializationConfig;

import java.io.IOException;

/**
 * Utility for serializing arbitrary classes to Json strings then
 * back to their original objects.  Provides default {@link ObjectMapper}
 * behavior with public static methods, as well as versions accepting
 * a user-configured {@link ObjectMapper}.
 */
public final class JsonSerializer {
    private static final ObjectMapper defaultObjectMapper = new ObjectMapper();

    public static void JsonSerializer() {
        defaultObjectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
         defaultObjectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
    }
    /**
     * Serialize to JSON from a source object with
     * the user-provided {@link ObjectMapper}.
     */
    public static String serialize(Object source, ObjectMapper mapper) throws IOException {
        return mapper.writeValueAsString(source);
    }

    /**
     * Serialize to JSON from a source object using
     * the default configuration of the {@link ObjectMapper}.
     */
    public static String serialize(Object source) throws IOException {
        return serialize(source, defaultObjectMapper);
    }

    /**
     * Deserialize from JSON to a an object of type T using
     * the user-provided {@link ObjectMapper}.
     */
    public static <T> T deserialize(String source, ObjectMapper mapper, Class<T> cls) throws IOException {
        return mapper.readValue(source, cls);
    }

    /**
     * Deserialize from JSON to a an object of type T using
     * the default configuration of the {@link ObjectMapper}.
     */
    public static <T> T deserialize(String source, Class<T> cls) throws IOException {
        return deserialize(source, defaultObjectMapper, cls);
    }

    private JsonSerializer() {
        throw new UnsupportedOperationException("Cannot instantiate class '"+ getClass() +"'.");
    }
}