java - Unable to translate portuguese characters that is part of a name in XML String -

i facing trouble in translating portuguese characters part of field in xml string. using transform method , encoded iso-8859-1 , ended following error:

javax.xml.transform.transformerexception: com.sun.org.apache.xml.internal.utils.wrappedruntimeexception: invalid byte 2 of 3-byte utf-8 sequence. 

here code using.

string transformedmessage = "";  bytearrayinputstream bais = null; try {     bais = new bytearrayinputstream(             inputmessage.getbytes("iso-8859-1")); } catch (unsupportedencodingexception e) {     // todo auto-generated catch block     e.printstacktrace(); } streamsource xsltsource = new streamsource(         new bytearrayinputstream(xslttemplate.getbytes()));  streamsource source = new streamsource(bais,"iso-8859-1"); bytearrayoutputstream baos = new bytearrayoutputstream(); streamresult result = new streamresult(baos);  transformerfactory factory = transformerfactory.newinstance(); transformer transformer = factory.newtransformer(xsltsource);  transformer.transform(source, result); transformedmessage = baos.tostring();  return transformedmessage; 

inputmessage has name tag name "olá" (related hex decimals : 4f 6c e1), whcih in portuguese.

the same code working if send chinese , thai characters. can please me error?

heres sample xml using.

<?xml version="1.0" encoding="utf-8"?><transactionprocessor> <request> <messagedata> <messagetype>authorization</messagetype> <ipaddress>187.150.23.80</ipaddress> <issuedate>20150715</issuedate> <travelagencyname>sindicato olá</travelagencyname> <traveldate>20150716</traveldate> <issuingcarriercode>ij</issuingcarriercode> </transactiondata> </request> </transactionprocessor>