Java is an object-oriented programming language developed by Sun Microsystems, a company best known for its high-end UNIX workstations. Modeled after C++, the Java language was designed to be small, simple, and portable across platforms and operating systems, both at the source and at the binary level, which means that Java programs (applets and applications) can run on any machine that has the Java virtual machine installed. A stored procedure is a set of Structured Query Language (SQL) statements that you assign a name to and store in a database in compiled form so that you can share it between a number of programs. In a nutshell, Java stored procedures are Java classes, stored as Oracle schema objects, made accessible to Oracle SQL and PL/SQL through call specifications. Call specifications are simply PL/SQL declarations that 'wrap' methods of Java stored in the database.Since Oracle8i, Release 1 (Oracle 8.1.5), Oracle has offered a tightly integrated Java virtual machine (JVM) that supports Oracle's database session architecture. Any database session may activate a virtually dedicated JVM during the first Java code invocation; subsequent users then benefit from this already Java-enabled session. In reality, all sessions share the same JVM code. Beginning with version 8i, the Oracle database includes a fully functional Java Virtual Machine, Oracle JVM. Out of this close relationship between Oracle and Java emerges an important technology for Oracle developers: Java stored procedures. With Java stored procedures, developers have the ability to harness the power of Java when building database applications.
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