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gwt-jackson is a GWT JSON serializer/deserializer mechanism based on Jackson annotations
There is a newer version: 0.15.4
package com.github.nmorel.gwtjackson.client.ser;

import javax.annotation.Nonnull;
import java.io.IOException;
import java.math.BigDecimal;
import java.math.BigInteger;

import com.github.nmorel.gwtjackson.client.JsonSerializationContext;
import com.github.nmorel.gwtjackson.client.JsonSerializer;
import com.github.nmorel.gwtjackson.client.stream.JsonWriter;

/**
 * Base implementation of {@link JsonSerializer} for {@link Number}.
 *
 * @author Nicolas Morel
 */
public abstract class BaseNumberJsonSerializer extends JsonSerializer {

    /**
     * Default implementation of {@link BaseNumberJsonSerializer} for {@link BigDecimal}
     */
    public static final class BigDecimalJsonSerializer extends BaseNumberJsonSerializer {

        private static final BigDecimalJsonSerializer INSTANCE = new BigDecimalJsonSerializer();

        /**
         * @return an instance of {@link BigDecimalJsonSerializer}
         */
        public static BigDecimalJsonSerializer getInstance() {
            return INSTANCE;
        }

        private BigDecimalJsonSerializer() { }
    }

    /**
     * Default implementation of {@link BaseNumberJsonSerializer} for {@link BigInteger}
     */
    public static final class BigIntegerJsonSerializer extends BaseNumberJsonSerializer {

        private static final BigIntegerJsonSerializer INSTANCE = new BigIntegerJsonSerializer();

        /**
         * @return an instance of {@link BigIntegerJsonSerializer}
         */
        public static BigIntegerJsonSerializer getInstance() {
            return INSTANCE;
        }

        private BigIntegerJsonSerializer() { }
    }

    /**
     * Default implementation of {@link BaseNumberJsonSerializer} for {@link Byte}
     */
    public static final class ByteJsonSerializer extends BaseNumberJsonSerializer {

        private static final ByteJsonSerializer INSTANCE = new ByteJsonSerializer();

        /**
         * @return an instance of {@link ByteJsonSerializer}
         */
        public static ByteJsonSerializer getInstance() {
            return INSTANCE;
        }

        private ByteJsonSerializer() { }
    }

    /**
     * Default implementation of {@link BaseNumberJsonSerializer} for {@link Double}
     */
    public static final class DoubleJsonSerializer extends BaseNumberJsonSerializer {

        private static final DoubleJsonSerializer INSTANCE = new DoubleJsonSerializer();

        /**
         * @return an instance of {@link DoubleJsonSerializer}
         */
        public static DoubleJsonSerializer getInstance() {
            return INSTANCE;
        }

        private DoubleJsonSerializer() { }

        @Override
        public void doSerialize( JsonWriter writer, @Nonnull Double value, JsonSerializationContext ctx ) throws IOException {
            // writer has a special method to write double, let's use instead of default Number method.
            writer.value( value.doubleValue() );
        }
    }

    /**
     * Default implementation of {@link BaseNumberJsonSerializer} for {@link Float}
     */
    public static final class FloatJsonSerializer extends BaseNumberJsonSerializer {

        private static final FloatJsonSerializer INSTANCE = new FloatJsonSerializer();

        /**
         * @return an instance of {@link FloatJsonSerializer}
         */
        public static FloatJsonSerializer getInstance() {
            return INSTANCE;
        }

        private FloatJsonSerializer() { }
    }

    /**
     * Default implementation of {@link BaseNumberJsonSerializer} for {@link Integer}
     */
    public static final class IntegerJsonSerializer extends BaseNumberJsonSerializer {

        private static final IntegerJsonSerializer INSTANCE = new IntegerJsonSerializer();

        /**
         * @return an instance of {@link IntegerJsonSerializer}
         */
        public static IntegerJsonSerializer getInstance() {
            return INSTANCE;
        }

        private IntegerJsonSerializer() { }
    }

    /**
     * Default implementation of {@link BaseNumberJsonSerializer} for {@link Long}
     */
    public static final class LongJsonSerializer extends BaseNumberJsonSerializer {

        private static final LongJsonSerializer INSTANCE = new LongJsonSerializer();

        /**
         * @return an instance of {@link LongJsonSerializer}
         */
        public static LongJsonSerializer getInstance() {
            return INSTANCE;
        }

        private LongJsonSerializer() { }

        @Override
        public void doSerialize( JsonWriter writer, @Nonnull Long value, JsonSerializationContext ctx ) throws IOException {
            // writer has a special method to write long, let's use instead of default Number method.
            writer.value( value.longValue() );
        }
    }

    /**
     * Default implementation of {@link BaseNumberJsonSerializer} for {@link Short}
     */
    public static final class ShortJsonSerializer extends BaseNumberJsonSerializer {

        private static final ShortJsonSerializer INSTANCE = new ShortJsonSerializer();

        /**
         * @return an instance of {@link ShortJsonSerializer}
         */
        public static ShortJsonSerializer getInstance() {
            return INSTANCE;
        }

        private ShortJsonSerializer() { }
    }

    @Override
    public void doSerialize( JsonWriter writer, @Nonnull N value, JsonSerializationContext ctx ) throws IOException {
        writer.value( value );
    }
}