When Digester read tomcat-user.xml file and exception is throw, then is created
new LifecycleException. As first parameter of this Exception is message string.
This string is hardcoded to "memoryRealm.readXml", so I thing that log message
will be wrong too!

I think that there must be used StringManager.

actual implementation:

Digester digester = getDigester();
try {
  synchronized (digester) {
    digester.push(this);
    digester.parse(file);
  }
} 
catch (Exception e) {
  throw new LifecycleException("memoryRealm.readXml", e);
} 
finally {
  digester.reset();
}


fixed:

Digester digester = getDigester();
try {
  synchronized (digester) {
    digester.push(this);
    digester.parse(file);
  }
} 
catch (Exception e) {
  throw new LifecycleException(sm.getString("memoryRealm.readXml"), e);
} 
finally {
  digester.reset();
}