https://github.com/spring-projects/spring-framework: Spring Object/XML Marshalling (Spring IO)
  • Juergen Hoeller 
Contains (un)marshallers optimized to store binary data in MIME attachments.

/**
 * Contains (un)marshallers optimized to store binary data in MIME attachments.
 */
@NonNullApi
@NonNullFields
package org.springframework.oxm.mime;

import org.springframework.lang.NonNullApi;
import org.springframework.lang.NonNullFields;