Neo4j Embedded Persistence Problem

  def create(title: String, appliesTo:String, fields:List[(String, Long, Boolean, List[Map[String,String]])], isControlled:Boolean): Schema = {
    val tx = db.beginTx()

    val schemaNode = db.createNode(Schema.label)
    schemaNode.setProperty("title", title)
    schemaNode.setProperty("appliesTo", appliesTo)
    schemaNode.setProperty("isControlled", isControlled)
    fields.zipWithIndex.map({
      case ((name, dataTypeId, isControlled, terms), index) => {
        val fieldTypeNode = db.getNodeById(dataTypeId)
        val fieldNode = db.createNode(SchemaField.label)
        fieldNode.setProperty("title", name)
        fieldNode.setProperty("isControlled", isControlled)
        fieldNode.createRelationshipTo(fieldTypeNode, isType)
        val relationship = schemaNode.createRelationshipTo(fieldNode, hasField)
        relationship.setProperty(FIELD_ORDER, index)
        fieldNode
      }
    })

    tx.success()
    tx.close()
    schemaNode
  }