The Java Device Driver Kit (JDDK) enables Java device drivers to run on various operating systems and supports both horizontal and vertical market software. The JDDK is currently at FCSc2 and allows developers to write device-aware software like applications, drivers, services and packages. It uses a configuration framework that defines software through business cards and configuration archive files.

2. Java Device Driver Kit
(JDDK)
Tom Saulpaugh
Sun Microsystems, Inc.

3. JDDK Introduction
 JDDK enables Java device drivers for JavaOS™,
Solaris™, Windows™, OS/2™, Macintosh™,
Linux or any other host OS supporting JDK 1.1.6
or better
 The next step beyond javax.comm in local device
support on the Java software platform
 Supports horizontal (WORA) and vertical market
software
 Java Point Of Sale (JavaPOS™) retail software
- http://www.javapos.com/
 Java Point Of Sale (JxFS™) financial software
- http://www.jxfs.com/

4. JDDK Relationships to:
 Java Platform Services (JPS)
- Core code of JDDK shared with JavaOS
 JavaOS
- Shares JPS codebase including JSD, JSL, JSE,
and Security Manager
 JDK
- JDDK runs as a configurable Java software
application
 Java Communications API (javax.comm)
- Loadable package configured by JDDK

5. Current & Future JavaPOS,
JDDK and JavaOS Releases
 JavaPOS 1.3 released, with 1.4 in
development
 JDDK FCSc2 released
- June 30th, 1999
 Final JDDK FCS in development
- Summer 99
 JavaOS For Business v2.1 released
- Nov 98
 JavaOS For Business v2.2 in development
- Summer 99

6. What’s in the JDDK?
 Documentation
- Readme, javadoc, JPS Specification, JSD Spec
 JPS.jar
- JSD, JSL, JSE, Security Manager classes
 Sample business cards
 Sample applications
 Sample services
 Sample packages

7. What’s NOT in the JDDK?
 CommAPI and the JDK
- Download these from Java Developer Connection
(JDC)
- Get correct version for your host OS
 Java Software Toolset and IDE
- Use your favorite one (The JDDK group likes the
Metrowerks CodeWarrior™ product)
 JavaOS or any other OS / native libraries
 Thin-client or Fat-client admin toolset

8. What can you do with the
JDDK?
 Write WORA and/or local device-aware
software
- Apps
- Drivers
- Services
- Packages
 Use it as a JavaOS For Business software
development tool free
 Deploy it as a Java client configuration
framework
- Admin toolset (Browser) needed

9. JDDK Installation
It’s easy:
 Create a directory on client for the JDDK
 Unzip the JDDK zip file
- Sample JavaSystemFolder created (JDDK root
mount pt.)
- Creates configuration sub-directories and files
necessary to run sample demo
- Creates demo directory containing sample jars
- Creates doc directories
- Creates archive directory

10. JDDK FCSc2 Contents

11. Running the Sample JDDK
Demo
 Start the JRE
- JDK 1.1.6 classes.zip in classpath
- JPS.jar and javax.comm in classpath
 Specify JPSMain as the main startup class
- javaos.javax.system.platform.JPSMain
 Specify config mount pt. to JPSMain
- “myclient/JavaSystemFolder”
 Specify debug lvl (0,1,2) and options (-rescan)

12. What’s in the Demo?
 JavaPOS 1.3 package
- /system/package/jpos13.jar
- Loaded first by JDDK
 Sample JavaPOS application
- /
application/package/Application/com/ibm/jpos/De
moPOSApp.jar (loads second)
 Sample JavaPOS printer service
- /
application/service/com/ibm/jpos/POSPrinterServi
ce.jar
- Loaded last (when opened by application)

13. Demo

14. JavaSystemFolder
 Root Mount Pt. containing client config info
- Business card files identify software to configure
- JDDK-generated configuration archive files
capture “software sets”
 Automatically scanned by JDDK
- when no config archive files are present
- “-rescan” option is specified as startup param
- Result of scan is a named “software set” such as
“current client configuration”
 Mount pt. directory path passed as startup
param (could even be on server)

15. JavaSystemFolder
 Identify software to configure
- System software (runs first)
- Application software (runs after system software)
 Identify software sets
- Collection of business cards
- Auto-generated as result of scan
 Each client references a JavaSystemFolder
- Duplicated for each client OR
- Shared on server

17. LAN Client Configuration
Client
Server
Client
Sharing the
Server’s
JavaSystemFolder
Intranet
Clients

18. Thin Client (WAN or LAN)
Client
Server
Synchronization with Server’s
JavaSystemFolder
Intranet OR
Internet
Clients

19. Software Business Cards
 Identifies software bundles (JARs)
- Applications, Drivers, Services, Packages
 Identifies software lifecycle classes
- PackageInstance and ServiceInstance interfaces
 Parser plug-ins for HTML, Text, and XML
(future)
 Contents
- Standard portion including code URLs
- Optional custom portion to hold software
configuration parameters

20. Business Cards Define
Configuration Parameters
 Standard parameters used by JSL
- Title (Displayed by admin toolset) and
code/resource URLs
- Matching names and loading options
 Loading Options
- Always load, load when matched to device, or lazy
load (load when first used)
 Custom property and attribute access
- JSD property api used to get / set values
- Attributes are special “meta-properties”

22. Business Card Definitions
using the JDDK or JOS4B
 JDDK uses a configuration grammar
- Read by a parser / compiler during startup
- Creates business card entries in JSD
- Grammar resides in files outside JARs
- Grammar is text, and edited using a text editor
and/or browser
- Grammar can be embedded in HTML or XML
 JavaOS For Business toolset uses beans
within the application or service JAR to
define Business cards
- Rest of code in JAR is the same

23. 4 JDDK Configuration Archive
Files (Software Sets)
 /archive/jsd/config directory
- System Services File
- System Packages File
- Application Services File
- Application Packages File
 JPOS v1.3 is a system package
 POS Printer Service is an application package
 POS Demo Application is an application
service (lazy load upon connection)

24. Config tree grammar overview
 Keywords / Delimiters
 Attributes
 Entry name
 Properties
 Template name
 Tree name
 ; “” : = [ ]
 // and /* comments */
 Description
 Define attributes
 Define a JSD entry
 Define properties
 Define template
 Define config tree
 Delimiters
 Comments

25. Property & Attribute Values
 Compiler Primitive Types
- Strings, booleans, bytes, chars, doubles, floats,
ints, longs, and shorts
 Arrays supported using ‘[ ]’ token
 Boolean values are “true” or “false”
 Number values use Java language syntax
 Default type is unicode String with value in “
“
- myStringProperty = “this is a string”;

26. Property and Attribute Value
Templates
 Used to define property and attribute values
NOT understood by config tree compiler
- NOT a string, boolean, or number
 Template names class that understands how
to construct this kind of object
 BusinessCard template class supplied with
JDDK
 Extensible mechansim for application and
driver developers much like beans

27. Business Card Template
 Template
javaos.javax.system.services.BusinessCard
{ … primitive values go in here }
 Template compiled when JPS starts
 Template can also be written or “de-
compiled” upon JPS exit or under the control
of the application

28. Java Driver Development Kit
Summary
 JDDK is at FCSc2, with “final” FCS in
Summer 99
 Runs on ANY OS that supports JDK 1.1.6
 Uses ANY Java software toolset / Browser
 Supports Comm API Version 2.0
 Contains JSD, JSL, JSE, and many other core
JOS4B OS components
 Drivers that use Comm API to access device
run in JDDK and JavaOS For Business

29. Further Information
 New Addison Wesley Longman Book
“Inside the JavaOS Operating System”
http://www.awl.com/
 Sun web sites:
http://www.sun.com/javaos/business
http://java.sun.com/
 Vertical market web sites:
http://www.javapos.com/
http://www.jxfs.com/

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