Jackson Data Binding Source Code

Jackson is "the Java JSON library" or "the best JSON parser for Java". Or simply as "JSON for Java".

  • Jackson Data Binding module allows you to converts JSON to and from POJO (Plain Old Java Object) using property accessor or using annotations.
  • Jackson Databind Source Code files are provided in the source packge (jackson-databind-2.12.4-sources.jar). You can download it at Jackson Maven Website.

    You can also browse Jackson Databind Source Code below:

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    package com.fasterxml.jackson.databind.ext;
    import java.io.IOException;
    import java.io.InputStream;
    import java.sql.Blob;
    import java.sql.SQLException;
    import com.fasterxml.jackson.core.JsonGenerator;
    import com.fasterxml.jackson.core.JsonToken;
    import com.fasterxml.jackson.core.type.WritableTypeId;
    import com.fasterxml.jackson.databind.*;
    import com.fasterxml.jackson.databind.annotation.JacksonStdImpl;
    import com.fasterxml.jackson.databind.jsonFormatVisitors.JsonArrayFormatVisitor;
    import com.fasterxml.jackson.databind.jsonFormatVisitors.JsonFormatTypes;
    import com.fasterxml.jackson.databind.jsonFormatVisitors.JsonFormatVisitorWrapper;
    import com.fasterxml.jackson.databind.jsontype.TypeSerializer;
    import com.fasterxml.jackson.databind.ser.std.StdScalarSerializer;
     * Serializer implementation for {@link java.sql.Blob} to write as binary
     * (for JSON and other formats Base64-encoded String, for binary formats as
     * true binary).
     * @see com.fasterxml.jackson.databind.ser.std.ByteArraySerializer
     * @since 2.12
    public class SqlBlobSerializer
    extends StdScalarSerializer<Blob>
        public SqlBlobSerializer()  {
        public boolean isEmpty(SerializerProvider provider, Blob value) {
            // Could see if "length == 0" but that might be expensive operation
            return (value == null);
        public void serialize(Blob value, JsonGenerator gen, SerializerProvider ctxt)
                throws IOException {
            _writeValue(value, gen, ctxt);
        // Copied from `com.fasterxml.jackson.databind.ser.std.ByteArraySerializer`
        public void serializeWithType(Blob value, JsonGenerator gen, SerializerProvider ctxt,
                TypeSerializer typeSer)
            throws IOException
            // most likely scalar
            WritableTypeId typeIdDef = typeSer.writeTypePrefix(gen,
                    typeSer.typeId(value, JsonToken.VALUE_EMBEDDED_OBJECT));
            _writeValue(value, gen, ctxt);
            typeSer.writeTypeSuffix(gen, typeIdDef);
        protected void _writeValue(Blob value, JsonGenerator gen, SerializerProvider ctxt)
                throws IOException
            InputStream in = null;
            try {
                in = value.getBinaryStream();
            } catch(SQLException e)  {
                        "Failed to access `java.sql.Blob` value to write as binary value");
            gen.writeBinary(ctxt.getConfig().getBase64Variant(), in, -1);
        // Copied from `com.fasterxml.jackson.databind.ser.std.ByteArraySerializer`
        public void acceptJsonFormatVisitor(JsonFormatVisitorWrapper visitor, JavaType typeHint)
            throws JsonMappingException
            // 08-Nov-2020, tatu: Same problem as for `byte[]`... should
            //    make work either as String/base64, or array of numbers,
            //   with a qualifier that can be used to determine it's byte[]
            JsonArrayFormatVisitor v2 = visitor.expectArrayFormat(typeHint);
            if (v2 != null) {



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