Binary Client Protocol

private static void writeRequestHeader(int reqLength, short opCode, long reqId, DataOutputStream out) throws IOException {
  // Message length
  writeIntLittleEndian(10 + reqLength, out);

  // Op code
  writeShortLittleEndian(opCode, out);

  // Request id
  writeLongLittleEndian(reqId, out);
}

private static void readResponseHeader(DataInputStream in) throws IOException {
  // Response length
  final int len = readIntLittleEndian(in);

  // Request id
  long resReqId = readLongLittleEndian(in);

  // Success code
  int statusCode = readIntLittleEndian(in);
}

<bean id="ignite.cfg" class="org.apache.ignite.configuration.IgniteConfiguration">
    <!-- Thin client connection configuration. -->
    <property name="clientConnectorConfiguration">
        <bean class="org.apache.ignite.configuration.ClientConnectorConfiguration">
            <property name="host" value="127.0.0.1"/>
            <property name="port" value="10900"/>
            <property name="portRange" value="30"/>
        </bean>
    </property>

    <!-- Other Ignite Configurations. -->

</bean>

IgniteConfiguration cfg = new IgniteConfiguration();

ClientConnectorConfiguration ccfg = new ClientConnectorConfiguration();
ccfg.setHost("127.0.0.1");
ccfg.setPort(10900);
ccfg.setPortRange(30);

// Set client connection configuration in IgniteConfiguration
cfg.setClientConnectorConfiguration(ccfg);

// Start Ignite node
Ignition.start(cfg);

Socket socket = new Socket();
socket.connect(new InetSocketAddress("127.0.0.1", 10800));

String username = "yourUsername";

String password = "yourPassword";

DataOutputStream out = new DataOutputStream(socket.getOutputStream());

// Message length
writeIntLittleEndian(18 + username.length() + password.length(), out);

// Handshake operation
writeByteLittleEndian(1, out);

// Protocol version 1.0.0
writeShortLittleEndian(1, out);
writeShortLittleEndian(1, out);
writeShortLittleEndian(0, out);

// Client code: thin client
writeByteLittleEndian(2, out);

// username
writeString(username, out);

// password
writeString(password, out);

// send request
out.flush();

// Receive handshake response
DataInputStream in = new DataInputStream(socket.getInputStream());
int length = readIntLittleEndian(in);
int successFlag = readByteLittleEndian(in);

// Since Ignite binary protocol uses little-endian byte order,
// we need to implement big-endian to little-endian
// conversion methods for write and read.

// Write int in little-endian byte order
private static void writeIntLittleEndian(int v, DataOutputStream out) throws IOException {
  out.write((v >>> 0) & 0xFF);
  out.write((v >>> 8) & 0xFF);
  out.write((v >>> 16) & 0xFF);
  out.write((v >>> 24) & 0xFF);
}

// Write short in little-endian byte order
private static final void writeShortLittleEndian(int v, DataOutputStream out) throws IOException {
  out.write((v >>> 0) & 0xFF);
  out.write((v >>> 8) & 0xFF);
}

// Write byte in little-endian byte order
private static void writeByteLittleEndian(int v, DataOutputStream out) throws IOException {
  out.writeByte(v);
}

// Read int in little-endian byte order
private static int readIntLittleEndian(DataInputStream in) throws IOException {
  int ch1 = in.read();
  int ch2 = in.read();
  int ch3 = in.read();
  int ch4 = in.read();
  if ((ch1 | ch2 | ch3 | ch4) < 0)
    throw new EOFException();
  return ((ch4 << 24) + (ch3 << 16) + (ch2 << 8) + (ch1 << 0));
}


// Read byte in little-endian byte order
private static byte readByteLittleEndian(DataInputStream in) throws IOException {
  return in.readByte();
}

// Other write and read methods