title: Cannot serialize LocalDate in Mongodb
body: <p>I am using the java 8 java.time.LocalDate to parse around dates.</p>
  
  <p>But trying to insert a LocalDate object to mongodb. I get errors in the java driver:</p>
  
  <pre><code>private def writeData(measure: DBCollection, installation: Int, date: String, dates: ListBuffer[LocalDate],
                      values: ListBuffer[BigDecimal], validated: Boolean, overwrite: Boolean) {
    val timeValues: BasicDBList = new BasicDBList
    var i = 0
    while ( i &lt; dates.size )  {
      val obj: BasicDBObject = new BasicDBObject("time", dates(i))
      obj.put("value", values(i).toString())
      timeValues.add(obj)
      i += 1
    }
    if ( debug ) System.out.println("Storedata: " + timeValues.toString) &lt;-- error here
  </code></pre>
  
  <p>Errorlog:</p>
  
  <blockquote>
    <p>java.lang.RuntimeException: json can't serialize type : class java.time.LocalDate
        at com.mongodb.util.ClassMapBasedObjectSerializer.serialize(ClassMapBasedObjectSerializer.java:77)
        at com.mongodb.util.JSONSerializers$MapSerializer.serialize(JSONSerializers.java:317)
        at com.mongodb.util.ClassMapBasedObjectSerializer.serialize(ClassMapBasedObjectSerializer.java:79)
        at com.mongodb.util.JSONSerializers$IterableSerializer.serialize(JSONSerializers.java:290)
        at com.mongodb.util.ClassMapBasedObjectSerializer.serialize(ClassMapBasedObjectSerializer.java:79)
        at com.mongodb.util.JSON.serialize(JSON.java:54)
        at com.mongodb.util.JSON.serialize(JSON.java:40)
        at com.mongodb.BasicDBList.toString(BasicDBList.java:38)
        at web.MeasureAccess.writeData(MeasureAccess.scala:203)
        at web.MeasureAccess.firstTime(MeasureAccess.scala:52)
        at web.MeasureAccess$.main(MeasureAccess.scala:262)
        at web.MeasureAccess.main(MeasureAccess.scala)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:483)
        at com.intellij.rt.execution.application.AppMain.main(AppMain.java:134)</p>
  </blockquote>
  
  <p>I am using the mongo-java-driver-2.13.0-rc1.jar
  Scala 2.11.4
  and java 1.8.0_25</p>
  
  <p>For completeness.</p>