Consider to create setPassword(char[] password) methods and store password as char array

[lospejos]

For security reasons, consider to create (and in the future - replace to) setPassword() method to take password argument as char array, not as String:

// in class com.cloudhopper.smpp.SmppSessionConfiguration:
// ... skipped
private char[] password;
// ...skipped
public void setPassword(char[] password);