in maven-jxr/src/main/java/org/apache/maven/jxr/JavaCodeTransform.java [476:484]
private Reader getReader(Path sourcefile, String inputEncoding) throws IOException {
Reader fr;
if (inputEncoding != null) {
fr = new InputStreamReader(new FileInputStream(sourcefile.toFile()), inputEncoding);
} else {
fr = new FileReader(sourcefile.toFile());
}
return fr;
}