[I] [Java] UnionListWriter.writeVarChar get a empty string list [arrow-java]

["sxh-lsc (via GitHub)" <gi...@apache.org>]

sxh-lsc opened a new issue, #214:
URL: https://github.com/apache/arrow-java/issues/214

   ```
       def writeListVector(writer: UnionListWriter, arr: Array[_], pose: Int): Unit = {
         writer.startList()
         writer.setPosition(pose)
         arr.foreach {
           case e: Short => writer.smallInt().writeSmallInt(e)
           case e: Int => writer.integer().writeInt(e)
           case e: Byte => writer.writeTinyInt(e)
           case e: String =>
             val rootAllocator = new RootAllocator()
             val tempBuf = rootAllocator.buffer(2048)
             val bytes = e.getBytes(StandardCharsets.UTF_8)
             tempBuf.setBytes(0, bytes, 0, bytes.length)
             writer.varChar().writeVarChar(0, bytes.length, tempBuf)
           }
         writer.setValueCount(arr.length)
         writer.endList()
       }
   ````  
   I use a function like above to write an array to a list vector, everything is normal except case String. It just returns a empty string list,which every elements' length is correct, like:
   `[["", ""], [""], ["", "", ""]]`
   can somebody help me?
   
   
   
   ### Component(s)
   
   Java


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