In Java applications, Oracle database can be widely used. Java language is very secured, and applications developed using Java maintain a certain level of security measures. Oracle is full-fledged RDBMS and hence integrating Oracle as a Database with Java-based frameworks, makes an application robust, scalable and multithreaded.
Java and RDBMS: A Robust Combination
Oracle Database provides dynamic data-processing engine that supports complex queries and different presentations. All the database queries get addressed concurrently and hence; multiple users can transact with the database simultaneously.
Java and Oracle combination builds component-based, network-centric applications that can be easily updated as business needs change. In client-server based or cloud-based applications, Java and Oracle combination provides the best performance & compatibility.
The reasons behind the success of Java and Oracle DB Application:
Multithreading is a key scalability feature of the Java programming language. The Java language and class libraries ease out the writing of multithreaded applications in Java than many other programming languages. Even then, it is a hectic task in any language to write reliable, scalable multithread code.
Oracle Database server is very much usable at a huge concurrency level. Oracle JVM uses the offerings of the database server for concurrent scheduling of the running of Java application for multiple users. Oracle Database does support Java language-level threads that the JLS and JCK requires. Yet scalability will not increase via threads within the scope of the database. The usage of the embedded scalability of the database eliminates the need for writing multithreaded Java servers.
Automated Storage Management with Garbage Collection-
Garbage collection has these following functions:
a. Automatic storage management feature of Java,
b. Elimination of the need to hire Java developers to allocate and explicitly empty memory.
Database Sessions Imposed on Java Applications:
In the Java-integrated Oracle Database, Java applications are present within the Database session. These JVM sessions are entirely analogous to traditional Oracle sessions.
Execution Control of Java Applications:
In the Java2 Platform, Standard Edition environment, Java application coding starts with a main() method, that the interpreter calls upon when the class is run.
User Interfaces on the Server-
Oracle Database furnishes all the core Java class libraries on the server. It also includes the one associated with the presentation of the user interfaces. Note that it is not suitable for code running on the server to try and materialize or showcase a user interface on the server. In case of the server in which the Oracle Database is running, users who are running applications in the Oracle JVM environment must not be expected nor allowed to interact with or rely on the display and input hardware of that particular server.
Java 1.4 outlines the Headless Abstract Window Toolkit (AWT) support, for compatibility issues on platforms that do not support display, mouse or keyboard. The Headless AWT API comes with a brand new public run-time exception class, java.awt.HeadlessException. The builders of the Applet class, all heavy-weight components, and several methods in the Toolkit and GraphicsEnvironment classes rely on the native display devices. These are changed to throw HeadlessException when the platform is not supporting a display. In Oracle Database, only client applications supported user interfaces. Hence, Oracle JVM is a Headless Platform and throws Headless Exception when these methods are called.