Java Notions Dictionary

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   TCP Protocol.
From PSH to ACK
TCP Algorithmes and Timeouts   Seven TCP Timeouts
Acknowledge Mechanisms

JRE
The Java Runtime Environment (JRE) is the minimum standard Java platform for running applications written in the Java programming language. It contains the Java Virtual Machine, Java core classes, and supporting files. The JRE does not contain any of the development tools (such as appletviewer or javac) or classes that pertain only to a development environment.
The JRE for Win 32 platforms is bundled with its own installer program. The availability of an easily installable JRE adds flexibility to the ways in which software suppliers can deliver software to their customers. Vendors of applications have the option of not bundling a copy of the JRE with their software. End-users can download and install the Windows JRE themselves. Once a user has installed the JRE, it can be used to run any number of applications written in the Java programming language.
 
JTS
The standard Java transaction management interfaces are defined in two separate standard extensions: the Java Transaction Service (JTS) and the Java Transaction API (JTA).
Java Transaction Service defines a low-level transaction management specification intended for vendors who provide the transaction system infrastructure required to support application run time environment.
Java Transaction API (JTA) defines a high-level transaction management specification intended for resource managers and transactional applications in distributed transaction systems.
The revised Java Transaction Service (JTS), which now consists of
A standard Java mapping of the OMG Object Transaction Service (OTS). The Java mapping of the OTS interfaces is defined in the packages org.omg.CosTransactions and org.omg.CosTSPortability.
Java mapping of the OMG Object Transaction Service (OTS) The packages org.omg.CosTransactions and org.omg.CosTSPortability define the Java mapping of the Object Management Group's Transaction Service (OTS) 1.1 interfaces using the standard IDL/Java language mapping.
This API is intended for a CORBA application or system programmer using the Java language. The API provides the programmer the following functionality:
Transaction demarcation interface.
Transactional resource manager interface.
Transactional object synchronization interface.
Transaction propagation interface.
 
JTAPI
The Java Telephony API (JTAPI) is a portable, object-oriented application programming interface for Java-based computer-telephony applications. JTAPI serves a broad audience, from call center application developers to web page designers.
The Java Telephony API is, in fact, a set of API's. The "core" API provides the basic call model and rudimentary telephony features, such as placing telephone calls and answering telephone calls.
 
patchlet
An update module for modifying the Java classes in a deployed device. This requires reprogrammable non-volatile memory such as Flash ROM or battery-backed up RAM.
Steps
Downloading a Patchlet. Shutdown VM. Replace Patchlet. Start VM. Now running the updated code Other Available Formats
 
PersonalJava
PersonalJava is a new Java Application Environment for network-connectable applications on personal consumer devices for home, office, and mobile use. Like Java, PersonalJava consists of core and standard extension (optional) APIs. It has been designed specifically for resource limited environments, with the addition of specific features required by consumer applications.
PersonalJava includes a feature-level subset of Java, so any PersonalJava-based application is also upward-compatible to Java.
Why PersonalJava?
With the advent of the World Wide Web, consumer devices need to be web-connectable, meaning they must support the download and execution of applets and applications. In addition, many of these devices will in themselves become development platforms as more content is brought to the consumer. PersonalJava is designed to reduce the overall cost of porting to multiple consumer device platforms, to create a stable resource for downloaded applets and applications to execute upon, and to enable developers to easily write total solutions--including back-end server and device-resident applications --using one development kit, the JDK.
 
PureJava
Basically, a pure Java program is one that relies only on the documented and specified Java platform. That means no native methods, no external dependencies aside from the Java Core APIs, and some other requirements that are detailed in the developer's 100% Pure Java Cookbookon our Web site. The certification process verifies that the code is in fact 100% Pure Java.
It is the only way to guarantee to both the developer and the end-user that the program really will run on multiple platforms.
 
scriptlet
Any valid Java code inside a < % and a % >
 
servlet, Java Servlets
What Are Servlets? Server side applets but faceless Dynamically extend server functionality and extensible Java API that defines the interface to a Servlet Return to Tracks
JDK 1.2 Contents Java Servlet API enables the creation of Java Servlets. For example, servlets can extend a web server's functionality in the same way that CGI scripts do. Servlets, however, are much less resource intensive than CGI scripts. Because servlets are written entirely in Java, again unlike CGI scripts, they are cross-platform as well.
Servlet API Servlets are protocol - and platform-independent server side components, written in Java. They basically replace cumbersome CGI script. Because the servlets are written in Java they are more flexible and stable than CGI scripts and give developers an interface that can be used on any platform without additional porting. As a result, servlets enable users to dynamically extend the functionality of their web server on the fly.
Servlets offer limitless opportunities to create and deploy a wide range of new, customized services and applications. For example, servlets can be used to look up records in a database in order to generate a web page on the fly. System administrators to manage network resources can upload administration servlets on demand. For instance, log servlets can monitor visitor activity at a web site, or proxy servlets are useful for traffic characterization and filtering.
Servlets are also suitable for load balancing in multi-tier applications that are a key requirement for building next-generation enterprise-class business systems. In a three-tier system, for example, the first tier could be a Java-enabled browser on a thin client, with the second tier consisting of servlets that encapsulate specific business rules and logic and the third tier comprised of legacy database information.
 
Signed applets ( Trusted applets )
Signed applets are delivered as cryptographically signed JAR files.
If an applet is signed with a trusted cryptographic key then the applet will be allowed to run fully trusted and will be able to access a user's local disk files, open arbitrary network connections, call native methods, etc.obj file, you should use the javakey -cs command to create a trusted identity and the javakey -ic command to import a certificate.
 
SQLJ
SQL statements include queries (SELECT), data-manipulation statements (INSERT, UPDATE, DELETE), and others that operate on data stored in tables in relational databases. SQLJ is a convention for embedding those SQL statements in Java, in a way that allows programing tools to perform translation-time (compile-time) analysis of SQL in Java, for syntax checking of SQL statements, for type checking to determine that the data exchanged between Java and SQL have compatible types and proper type conversions, and for schema checking to assure that the SQL constructs are well-formed and valid in the database schema where they will be executed. Embedded SQL statements are said to be "static" because they are textually evident in the Java program, and can therefore be compiled (the usual term is "pre-compiled") when the containing Java program is compiled. We propose SQLJ as a convenient and efficient standard for tightly integrated Java/SQL programs.




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