title: Serialization [Workaround] for ResourceBundle
body: <p>So my problem is the following:
  For an application that I need to write I have to implement the ability to store some DTOs to disk to be reused later on (in JSON format). Just to give you a broad frame of reference: The DTOs contain process/data models and also their graphical representation.</p>
  
  <p>To obtain the desired JSON files I currently use Jackson. This works out fine for the largest part, however, in one object that needs to be saved I use a ResourceBundle (to localize the program for different languages). And this is exactly where the problem comes in, as Jackson seems to be unable to serialize ResourceBundle objects (know that both from trying it, but also the research I have done so far basically told me the same).</p>
  
  <p>So I would like to ask you whether you might have an idea how to make it work, or whether you might have found some fancy workaround.</p>
  
  <p>For further illustration I will append some sample code which is not from the project in question, since I do this for someone else and I am not sure whether he would appreciate the release of his code.</p>
  
  <pre class="lang-java prettyprint-override"><code>public class SomeClass {
    private String name;
    private ResourceBundle bundle;
  
    public SomeClass(String name, ResourceBundle bundle) {
      this.name = name;
      this.bundle = bundle;
    }
  
    public String getName() {
      return this.name;
    }
  
    public ResourceBundle getBundle() {
      return this.bundle;
    }
  
    public void setName(String name) {
      this.name = name;
    }
  
    public void setBundle(ResourceBundle bundle) {
      this.bundle = bundle;
    }
  
    /*
      Here one could imagine some additional functionality making use of the 
      given ResourceBundle (something that has to be printed depending on the
      used language etc.). 
    */
  }
  </code></pre>
  
  <pre class="lang-java prettyprint-override"><code>import com.fasterxml.jackson.databind.ObjectMapper;
  import java.io.File;
  import java.io.IOException;
  import java.util.ResourceBundle;
  
  public class Saver {
  
    public static void main(String[] args) {
      Saver saver = new Saver();
      saver.run();
    }
  
    public void run() {
      ObjectMapper om = new ObjectMapper();
      ResourceBundle rb = ResourceBundle.getBundle("test");
      SomeClass sc = new SomeClass("SomeClass", rb);
      try {
        om.writeValue(new File("test.json"), sc);
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
  }
  </code></pre>
  
  <p>The resulting Stack Trace looks as follows:</p>
  
  <pre class="lang-java prettyprint-override"><code>com.fasterxml.jackson.databind.JsonMappingException: No serializer found for class sun.util.ResourceBundleEnumeration and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) ) (through reference chain: SomeClass["bundle"]-&gt;java.util.PropertyResourceBundle["keys"])
    at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:230)
    at com.fasterxml.jackson.databind.ser.impl.UnknownSerializer.failForEmpty(UnknownSerializer.java:68)
    at com.fasterxml.jackson.databind.ser.impl.UnknownSerializer.serialize(UnknownSerializer.java:32)
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:672)
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:678)
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:157)
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:672)
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:678)
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:157)
    at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:130)
    at com.fasterxml.jackson.databind.ObjectMapper._configAndWriteValue(ObjectMapper.java:3613)
    at com.fasterxml.jackson.databind.ObjectMapper.writeValue(ObjectMapper.java:2929)
    at Saver.run(Saver.java:22)
    at Saver.main(Saver.java:14)
  </code></pre>