Java Reference
In-Depth Information
Legacy Connectivity Options
• Screen Scraper: A screen scraper emulates a mainframe
terminal. Basically the screen scraper logs onto the
mainframe like a normal user and sends requests to the
mainframe and then reads the response. The problem with a
screen scraper is that if you change any of the mainframes
code there is always the possibility that the screen scraper will
stop working.
• Java Native Interface: JNI is used to allow Java to
communicate with programs written in languages like C++. In
effect you are wrapping the C++ code to make it available to
Java. For example you will wrap a C++ method
debitAccount
(int amount)
with a similar Java method; the Java method will
just call the C method. This means you can now make the
method accessible via RMI
• JAVA IDL: Java IDL adds CORBA (Common Object
Request Broker Architecture) capability to the Java platform,
providing standards-based interoperability and connectivity.
Java IDL enables distributed Web-enabled Java applications
to transparently invoke operations on remote network services
using the industry standard IDL (Object Management Group
Interface Definition Language) and IIOP (Internet Inter-ORB
Protocol) defined by the Object Management Group. Runtime
components
include
Java
ORB
for
distributed
computing
using IIOP communication.
Hibernate Vs JPA
JPA is just a specification, meaning there is no
implementation. You can annotate your classes as much as
