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There are two kinds of distributed computing model, they are CORBA and EJB. CORBA is more closed to structure architecture and more difficult while EJB is more closed to object architecture and easier.

Model	CORBA	EJB
OS	Windows/Linux/Unix	JAVA OS over Windows/Linux/Unix
Protocol	IIOP	RMI over IIOP
Interface describe file	IDL	JAVA
Data type	module	package
	interface (non-abstract)	signature interface and an operations interface, helper class, holder class
	interface (abstract)	signature interface, helper class, holder class
	constant (not within an interface)	public interface
	boolean	boolean
	char, wchar	char
	octet	byte
	string, wstring	java.lang.String
	short, unsigned short	short
	long, unsigned long	int
	long long, unsigned long long	long
	float	float
	double	double
	fixed	java.math.BigDecimal
	enum, struct, union	class
	sequence, array	array
	exception	class
	readonly attribute	accessor method
	readwrite attribute	accessor and modifer methods
	operation	method
Server sample code	org.omg.CORBA.ORB myORB = org.omg.CORBA.ORB.init(new String[0], null); Wombat myWombat = new WombatImpl(); javax.rmi.CORBA.Stub myStub = (javax.rmi.CORBA.Stub)PortableRemoteObject.toStub(myWombat); myStub.connect(myORB);	Context initialNamingContext = new InitialContext(); initialNamingContext.rebind("MyObject", myObj);
Client sample code	Hello obj = (Hello)PortableRemoteObject.narrow( initialNamingContext.lookup("HelloServer"), Hello.class);	Hello obj = (Hello)Naming.lookup("//" + getCodeBase().getHost() + "/HelloServer");