Vivek Kr Singh

There is an API available for this exact functionality. Please see http://opencsv.sourceforge.net/#sql-integration

You need to add MYSQL JDBC driver jar in your classpath. Check http://www.mysql.com/downloads/connector/j/

Yes. you need to explicitly add this in classpath of your project. Check http://commons.apache.org/dbcp/

I am getting familiar serialization API's in JDK. I have a simple question regarding implementation of java.io.DataOutPutStream writeXXX operations.

Here is the implementation for this API
/** * Writes an <code>int</code> to the underlying output stream as four * bytes, high byte first. If no exception is thrown, the counter * <code>written</code> is incremented by <code>4</code>. * * @param v an <code>int</code> to be written. * @exception IOException if an I/O error occurs. * @see java.io.FilterOutputStream#out */ public final void writeInt(int v) throws IOException { out.write((v >>> 24) & 0xFF); out.write((v >>> 16) & 0xFF); out.write((v >>> 8) & 0xFF); out.write((v >>> 0) & 0xFF); incCount(4); }

Why there is a bitwise & with 0xFF ?

Edit : out.write will only write a byte and bitwise & with 0xFF will return a byte

You can use java.util.concurrent.CountDownLatch

Suggest you to read Sun's RMI Hello World Page

Since you are using Spring, you could probably write an Interceptor which checks if the system is ready to serve requests or not. You can also use a normal http filter to achieve the same.

Piece of code below is thread safe, so no need for synchronized block

private AtomicLong sequenceNumber = new AtomicLong(0); System.out.println("Value is " + sequenceNumber.getAndIncrement());

Piece of code below is not thread safe as value can be modified by another thread when not using synchronized block
private AtomicLong sequenceNumber = new AtomicLong(0); long value = sequenceNumber.getAndIncrement(); System.out.println("Value is " + value);

Use java.lang.AtomicInteger or java.lang.AtomicLong. Invoke incrementAndGet() to get new value for counter. No explicit synchronization needed. Don't store response value in a reference.

try using this on JDK 1.5
MyRemote service = new MyRemoteSericeImpl(); MyRemote stub = (MyRemote) UnicastRemoteObject .exportObject(service, 0); LocateRegistry.getRegistry().bind("RemoteHello", stub);

java.rmi.ConnectException: Connection refused to host: hostname; nested exception is:

You must be running server code on same machine on which RMI registry is running. Client code can be executed from any machine provided the skeleton is available.

at java.rmi.Naming.rebind(Unknown Source)
at com.example.rmi.MyRemoteImpl.main(MyRemoteImpl.java:38)

Is your rmiregistry running ?

Ubuntu .. Simple to use, Excellent Forums

Billy, This looks all setup and should work

You can check this link but his books are very expensive in India

Siva Masilamani wrote:Then could you please explain what they are trying to point out here

"with either fragment the first output must be Yo"

Dudes instance created in go() has no synchronization associated with it. There is absolutely no guarantee which thread will execute flag = id first even when using synchronized keyword. It could be any of the threads who enter the block first.