Taglib Problem under Resin 2.1.11

[Hua Yu]

Hi all, I have experienced a very very strange problem under resin 2.1.11.
The environment is Resin2.1.11/MySql 4/ConnectorJ 3.08, all use default character encoding setting(iso-8859-1).
the data in mysql are store using iso-8859-1, so I use a taglib to do encoding convertion and show the converted chinese character on webpage. All program runs perfect under tomcat 4.1.18, but encounter encoding problem under resin.
I added debug code in the taglib, and print both Strings before conversion and after. The code snippet like

//print unconverted iso-8859-1 string
System.out.println(srcString);
//do encoding
String newString = new String(srcString.getBytes("iso-8859-1"),"gb2312");
//print converted gb2312 string
System.out.print(newString);

I've compare the two "srcString" value under two server, no difference, but after encoding, tomcat get the correct encoding result, but resin get ??? only.
I think this problem is not concerned with mysql jdbc/application server, coz it is only console print...
Has anyone encounter the same problem before? can anyone help me? This really made me crazy for several days...