[Problem]
When we look at changes, commit log is garbled.

[Cause]
Git assumes that commit log is written by utf-8, if we don't set "i18n.commitencoding" property.

hudson.plugins.git.GitChangeLogParser class uses java.io.FileReader class at 27.
java.io.FileReader class uses the default character encoding to read file.
Japanese version of Windows uses "MS932" as default character encoding.

So we run hudson on it, commit log is garbled.

[Solution]
use java.io.FileInputStream and java.io.InputStreamReader classes instead of java.io.FileReader class.
java.io.InputStreamReader class has a constructor that is able to set the encoding.

[Example]
BufferedReader rdr = null;
try {
// fetch encoding out of configuration
rdr = new BufferedReader(new InputStreamReader(new FileInputStream(changelogFile), encoding));
/* ... */
} finally {
// close rdr whether constructors throw exception or not
if (rdr != null) rdr.close();
}