Unicode display rightly but different characters

Question

Hi, I've tried inserting some chinese characters into the form, convert it to utf-8 and store in the database (db2 udb v7.2) using entity (cmp) beans. Everything looks ok until when i retrieved the data from the database , it sure display chinese characters but some of them are not the characters i initially entered, can some experts please help? Thanks in advance!
Below are the code i use to convert to utf-8 and back to display in a jsp page:
Converting to utf-8
byte[] fieldByteValue = field.toString().getBytes("ISO8859_1");
String fieldStringValue = new String(fieldByteValue, "UTF8");
Converting back from utf-8
byte[] fieldByteValue = this.fields.getBytes();
String fieldStringValue = new String(fieldByteValue, "UTF8");

Answer 1

If you are to store a byte array of a String object encoded in UTF-8, use this form, under the condition that the String object consists of correct chinese characters:
byte[] fieldByteValue = field.toString().getBytes("UTF8");It will be retrieved to a String object in the form:
String str = new String(fieldByteValue, "UTF8")