I Installed resin-pro-3.1.8 on Windows 2003 Server Simplified Chinese version. I found all error messages were garbled. I changed the resin.conf in the resin installation directory.
<javac compiler="internal" args="-source 1.5"/>
to
<javac compiler="javac" args="-source 1.5"/>
That fixed the issue. Moreover, since the locally installed JDK is the Chinese version, the compilation errors are now returned in Chinese from javac!