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Scriptom (, an optional Groovy module originally developed by Guillaume Laforge, combines the elegant "syntactical sugar" of Groovy with the power of the Jacob library (Java COM Bridge). The result is something that looks an awful lot like Windows Scripting Host (WSH) scripting with VBScript - only it's for Java.  Once installed into Groovy, Scriptom allows you to script ActiveX or COM Windows components from Groovy.

What this means is that you can use Groovy to automate Word or Excel documents, control Internet Explorer, make your PC talk using the Microsoft Speech API, monitor processes with WMI (Windows Management Instrumentation), or browse the Windows Registry using WShell (among many, many other things).  It is also a convenient way to talk to custom VB6 or COM-enabled Microsoft.NET libraries (compare this to the administrative headaches of getting Java and .NET to talk using Web Services - it's a no brainer).  All this without ever leaving the comfortable Java universe.

Of course, Scriptom can be used only on Microsoft Windows.

Scriptom is bundled into the Groovy Windows-Installer, and the most current version can be downloaded from this page (see below). The codebase is considered stable and feature-complete.  The Jacob project - Scriptom's foundation - was started in 1999 and is being used in thousands of production applications worldwide.  Scriptom is only a few years old, but it is already stable and mature because it is built on an existing, best-of-breed platform. 

Scriptom gives you all the COM-scripting power of Jacob, only it is a lot easier.

The Scriptom team


Scriptom 1.5 requires Groovy 1.5. Because of dependencies on Jacob 1.14, Scriptom also requires Java 1.5 or higher.

Download the project archive(s) and extract the files.

  • (tick) Build 8 (12/7/2007) - Scriptom JAR file, Scriptom-#.#.#b#-32.dll, *Scriptom-#.#.#b#-64.dll, Java source code, ANT build script, examples, tests, and utilities.
  • (info) - JavaDoc for Scriptom and included type-library information.

Install the jar file and DLL file into your project, and optionally install an update from Microsoft:

  1. Add the Scriptom jar file (scriptom-2.0bX.jar) into your Java classpath.  It contains both Scriptom and Jacob class files, so you don't need to include jacob.jar.
  2. Copy jacob.dll to somewhere on your java.library.path. (usually somewhere on the system 'PATH').
  3. To avoid the dreaded java.lang.UnsatisfiedLinkError, download and install the following update from Microsoft: Visual C redistributable installer SP1 . The Jacob documentation says this is only necessary for Windows Server 2003 and Windows 2000, but we've found that it may also be necessary for Windows XP.

NOTE: If you are using Scriptom 1.5 with the Groovy 1.0 Windows Installer or if you are using earlier versions of Scriptom (through version 1.2) in your existing projects, you may see errors due to conflicts with different versions of jacob.jar and jacob.dll. Do a wildcard search for 'jacob.'* and verify that you don't have any extra copies lying about.  In Scriptom 2.0, the jacob.jar file has been jarjar'd into the Scriptom JAR file.  For conflicting JAR files, a common symptom is java.lang.NoClassDefFoundError

Scriptom 1.5 is not supported for Groovy 1.0 and earlier (Scriptom 1.2 is still available). Please contact us if this presents a serious problem for you.

Building from Source

The project archive contains all the Scriptom source files and an ANT build script. However, to save space, jacob.jar and the Groovy JAR files have been omitted from the archive.  The ANT script jarjars jacob.jar into scriptom-2.0bX.jar as part of the build.  JAR files must be added to the project/lib folder.

The latest build requires Groovy 1.5.

The jacob.jar file is part of the Jacob library (Java COM Bridge).  Scriptom requires Jacob version 1.14 or later.

To build the project, run project/build/make.bat

The build process requires Java 1.5 or higher (Java 1.6 recommended) and ANT 1.6.5 or better.

Changes from Scriptom 1.x

Scriptom 1.5 is a substantial upgrade to previous versions of Scriptom, and is not backward compatible.  We hope you will agree that it is worth a little code rework to get all these great new features! 

  • Provides simplified helper methods for dealing with COM apartment threading models.
  • ActiveXProxy name changed to ActiveXObject to match WSH convention.
  • VariantProxy no longer exists (the functionality was refactored into ActiveXObject).
  • Variant values are converted to and from the equivalent Java type; no more calling .value on everything!
  • Supports COM event callbacks using closures (this is still a work in progress, but usable as is).
  • Supports indexed properties, including multiple indexes.
  • Supports typed, multi-dimensional SafeArrays.
  • Supports pass-byref (in/out) values, both in method calls and event handler callbacks.
  • Supports COM enumerable types (so you can use .each, for example).
  • Supports missing arguments (for optional parameters) in method/property calls and events.
  • Includes constant definitions for several popular Windows applications, derived from these type libraries (see JavaDoc):
    • Microsoft Office 2003 (works with other versions as well)
      • Word 2003
      • Excel 2003
      • Outlook 2003
      • Access 2003
      • PowerPoint 2003
    • Microsoft Internet Explorer 6 (works with other versions as well)
    • Microsoft Scripting (i.e., FileSystemObject)
    • Microsoft Speech API
    • Windows Scripting Host (WSH)
    • WbemScripting (WMI - Windows Management Instrumentation)
  • Supports the latest features from Jacob 1.14, including new support for the Decimal data type and 64-bit integers.

Migrating from Previous Versions of Scriptom

Scriptom 1.5 is not backward compatible with previous versions of Scriptom.  To get your scripts running again, do this:

  • Change all references to ActiveXProxy into ActiveXObject.
  • Wrap any code that references an ActiveXObject in Scriptom.withMTA { ... }, which replaces the way Scriptom previously handled COM threading.  
  • Remove all references to .value property references. 
  • Remove any statically typed references to VariantProxy.
  • Support for COM events is greatly improved in this version - and also greatly changed.  Refer to the Events section below for more information.
  • Verify that your project is using the correct version of jacob.dll.

Quick Start

Let's say you want an application that talks. Pure Java implementations aside (this is, after all, a Groovy/COM tutorial), and ignoring the fact that the default voice on pre-Vista machines sounds like Dr. Zoidberg with a sinus infection, you could use the Microsoft Speech API (SAPI) to get the job done.

You start by creating an ActiveXObject with the prog-id for SpVoice. Now you can call any of the methods it supports. By default, SpVoice will block until it is done speaking, but we're going to have it speak asynchronously and wait until it is done.

If you have scripted COM before, you are probably used to using "magic numbers" throughout your code in place of COM constants.  In this code sample, we're using fully-qualified constants instead.

Scriptom includes fully JavaDoc'd constant and interface definitions from a number of commonly used type-libraries, and you can even create your own.  The source code for generating COM type library definitions for Groovy is written in Groovy(smile) , and it's included in the project. It may not seem like a big deal to replace a couple of numbers, but it will be a lot easier in 10 years to find relevant information on SpeechVoiceSpeakFlags.SVSFlagsAsync than on the number 1 (Google returns a little more than 9 billion hits for the number '1', and about 1,000 for 'SpeechVoiceSpeakFlags.SVSFlagsAsync,' including hits on this paragraph).  And besides, the code reads better.

Speaking of interfaces, it turns out that SpVoice supports several.  You can test an ActiveXObject to see if it supports a given interface using .supportsInterface, and you can cast an ActiveXObject to a given interface using .toInterface

This next example displays the COM interfaces that SpVoice supports (within the SAPI library only):

Programmer's Guide 

The Least You Need to Know about COM

how not to crash the JVM or lock your process

COM Data Types in Scriptom

supported types and conversions in Java, VB6, and VB.NET

COM Methods and Properties in Scriptom

calling COM methods and properties from Groovy

Passing Values by Reference (in-out)

how to let methods change the value of passed-in arguments

COM Events

support for COM events

All About Arrays



Here is a simple example that uses the Microsoft ScriptControl to evaluate a JScript expression.   This is a very indirect way to add 2 and 2.

There are many, many potential uses for Scriptom - far to many to try to maintain as part of this documentation.   So we've included a whole slew of meaty examples in the project archive for you to play with.  We'd like to encourage you to go look at those examples, run them, and modify them.  And if you come up with an especially interesting example, let us know about it.  We may even include it in a future release! 

Some additional examples included with Scriptom:

  • Automated writing to and reading from Excel spreadsheets. Includes COM events example.
  • Navigation in Internet Explorer.  Includes COM events example. 
  • Gathering information about processes and Windows NT services using WMI.
  • Parsing a *.msg file with Microsoft Outlook.

Consuming Visual Basic 6 (VB6) and Visual Basic.NET COM-enabled DLLs.


Articles about COM scripting in general, and Scriptom in particular.

Getting Started with COM

January 11, 2008

Tips for exploring COM libraries, finding documentation, etc.

Bridging the Gap Between Java and .NET with Groovy and Scriptom

December 3, 2007

Implement FIPS 140-1 compliant SHA-1 in Java with Groovy, Scriptom, and Visual Basic.NET.

Juixe TechKnow

August 8, 2006

A short Microsoft Outlook example.


March 17th, 2008

Siebel "business component" programming

Post Scriptom

All known (unresolved) issues and feature requests are listed in the Scriptom Jira database.

Changes to each build are summarized in the Change Log.

Recent builds of Scriptom can be found here. Older versions are archived:

Build 10. Bundled with the Groovy 1.5 Windows Installer. Requires Groovy 1.5 and Java 5 or better.

Scriptom 1.2

(also Scriptom 1.1 and Scriptom 1.0) Original version, and the one that is documented in Groovy in Action. Requires Groovy 1.0 or better and Java 1.4 or better.

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