Programming languages for the Java Virtual Machine JVM

Iava is an interpreter that accepts a subset of the Java programming language which includes method declarations, all block statements, all statements and all expressions as specified by the Java language. The interpreter does not accept class or interface declarations. Iava is written in Java and can be embedded into any Java application and applet. It offers highly effective integration mechanisms (sharing of private fields between classes and scripts), declaration of “methods” in a script which can be invoced by the embedding application/applet, sharing of a “context” object to which scripts can refer to using “this”, etc.

NetScript is an environment for scripting with network components. The NetScript environment’s scripting language, which is an extension of the BASIC programming language, is deliberately kept simple, so the scripts are relatively easy to write and modify. In NetScript, a developer selects required components from a distributed catalog and then writes a script invoking methods on the components as if the components are local. When a script is launched, the NetScript run time determines component sites in the network and transparently moves the script as needed.

Rhino is an implementation of JavaScript written entirely in Java. The source code for Rhino is available under the NPL. e Rhino project was started at Netscape in Fall 1997. At the time, Netscape was planning to produce a version of Navigator written entirely in Java and so it needed an implementation of JavaScript written in Java. When Netscape stopped work on “Javagator”, as it was called, somehow Rhino escaped the axe (rumor had it that the executives “forgot” it existed). Since then, a couple of major companies (including Sun) have licensed Rhino for use in their products and paid Netscape to do so, allowing us to continue work on it. Now Rhino is planned to be part of several server products from Netscape as well.

W4F is a toolkit for the generation of wrappers for Web sources. It consists of a retrieval language to identify Web sources, a declarative extraction language (HEL: HTML Extraction Language) to express robust extraction rules and a mapping interface to export the extracted information into some user-defined data-structures.

Dawn is a dynamic scripting language based on RPN, supporting dynamic naming to create variable and methods names from String, scripts can dynamically override language default functions and the language is based on a package set, with default ones io, err, loops, test, util, math, stack, string

DynamicJava is a Java source interpreter executing programs written in Java in addition with scripting features. DynamicJava extends the Java grammar to accept many scripting features: Statements and expressions can be written outside classes, at the top-level. The variable declaration is optional. When the left part of an assignment is an unknown identifier, a variable is defined. The type of this variable is the type of the right part of the assignment. The dynamic casts are optional. The package clause can be used anywhere at the top-levelto set the current package. The syntax of this clause has been extended : writing package; set the current package to the anonymous package.