Android/Jsch - SSH Output always empty

Answer: I was reading the wrong stream AND had to close the connection afterwards.

JSch jsch = new JSch();
Session session = jsch.getSession(username, hostname, 22);
session.setPassword(password);

// Avoid asking for key confirmation
Properties prop = new Properties();
prop.put("StrictHostKeyChecking", "no");
session.setConfig(prop);

session.connect();

// SSH Channel
ChannelExec channelssh = (ChannelExec)
session.openChannel("exec");
InputStream inputStream = channelssh.getInputStream(); 

BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
StringBuilder stringBuilder = new StringBuilder();
String line;

/**/
// Execute command
channelssh.setCommand(command);
channelssh.connect();

while ((line = bufferedReader.readLine()) != null) {
    stringBuilder.append(line);
    stringBuilder.append('\n');
}

channelssh.disconnect();

return stringBuilder.toString();