If you have Java™ apps for Symbian phones, this webinar is for you. You‘ll learn how to use the newest features for developers on Series 40 phones and why it can be worthwhile to port your Java apps to serve this large market. Java expert Michael Samarin of Futurice will provide an overview of the differences between the Java runtime environments of Symbian and Series 40 and will show you how to adapt your Symbian apps to reach Series 40 users.

1. PORTING JAVA APPS FROM SYMBIAN TO
SERIES 40
Michael Samarin
Director,
Developer Training and Evangelism
Futurice

2. GENERAL CONSIDERATIONS
• Same development platform Java ME on Series 40 and
Symbian.
• Standard Midlets based on CLDC 1.1, MIDP 2.0 and common
JSRs will run without even recompiling on both Symbian and
Series 40.
• However, behavior and User Experience of Java apps might be
significantly different.
• APIs and Capabilities of Java Runtime on Symbian and Series 40
are different.

3. PORTING CHECKLIST
• Nokia SDK 2.0 For Java: Asha Full Touch Emulator, Nokia IDE for
Java
• Available JSRs and APIs, Media formats
• Platform Memory Requirements
• Java Runtime System Properties
• Performance
• UI optimization and User Experience
• http://www.developer.nokia.com/Resources/Library/Java

4. NOKIA SDK 2.0 FOR JAVA
Integrated SDK + Toolchain JAD Editor
App Templates Device SDK Manager
(NetBeans is supported as well)

7. PLATFORMS
5th Ed., FP1 6th Ed., Lite 6th Ed. 6th Ed., FP1 DP 1.0 DP 1.1 Developer Platform 2.0

8. Asha 311 Asha 309 Asha 205 Nokia 109 E72 S60 3Ed
APIs and JSRs (Belle FP1 – Nokia 808 PureView)
DP2 DP2 DP1 S40 6 Ed Light FP2
JSR 139 Connected, Limited Device Configuration (CLDC) 1.1 Yes Yes Yes Yes Yes
JSR 118 MIDP 2.1 Yes Yes Yes Yes Yes
JSR 75 FileConnection and PIM API 1.0 Yes Yes Yes Yes Yes
JSR 82 Java™ APIs for Bluetooth 1.1 Yes Yes Yes - Yes
JSR 172 J2ME™ Web Services Specification 1.0 (RPC package) Yes Yes Yes Yes Yes
JSR 172 J2ME™ Web Services Specification 1.0 (XML Parser package) Yes Yes Yes Yes Yes
JSR 177 Security and Trust Services API for J2ME™ 1.0 (SATSA-APDU package) Yes Yes Yes Yes Yes
JSR 177 Security and Trust Services API for J2ME™ 1.0 (SATSA-CRYPTO package) Yes Yes Yes Yes Yes
JSR 177 Security and Trust Services API for J2ME™ 1.0 (SATSA-PKI package) - - - - -
JSR 184 Mobile 3D Graphics API for J2ME™ 1.1 Yes Yes Yes Yes Yes
JSR 205 Wireless Messaging API 2.0 Yes Yes Yes Yes Yes
JSR 226 Scalable 2D Vector Graphics API for J2ME™ 1.1 Yes Yes Yes - Yes
JSR 234 Advanced Multimedia Supplements 1.1 (audio3d) Yes - Yes - Yes
JSR 234 Advanced Multimedia Supplements 1.1 (camera) Yes - Yes - -
JSR 234 Advanced Multimedia Supplements 1.1 (music) Yes Yes Yes - Yes
JSR 257 Contactless Communication API 1.0 - - - - -
IAP Info API 1.0 - - - - Yes
eSWT UI API 1.0.3 - - - - Yes
JSR 135 Mobile Media API 1.2 Yes Yes 1.1 Yes Yes
JSR 179 Location API for J2ME™ 1.0.1 1.0 1.0 1.0 1.0 1.0
JSR 211 Content Handler API 1.0.1 1.0 1.0 1.0 1.0 -
JSR 248 Mobile Service Architecture Subset 1.1 for CLDC 1.1 Yes Yes Yes - Yes
JSR 256 Mobile Sensor API 1.2 Yes Yes - - -
JSR 257 Contactless Communication API Extensions - - - - -
Nokia UI API 1.4 1.6 1.6 1.1 1.1 1.1

9. MEMORY REQUIREMENTS
• On Symbian there are no limitations on Java Heap space usage
or JAR file size.
• Series 40 limits Java Heap space to 2 or 4 Mb and JAR file size
to 1 or 2 Mb.
• Challenge for developers to minimize memory usage (exclude
image processing, big XML parsing). Use memory profiling with
SDK Emulator.
• Challenge for game making with large graphical assets. Utilize
post downloading with caching data in RecordStore.

11. SYSTEM PROPERTIES
• Make sure to explore differences in available System Properties on
Symbian and Series 40:
• http://www.developer.nokia.com/Resources/Library/Java/#!develope
rs-guides/application-framework/system-properties.html
• There are many unique System Properties available only on Series 40:
dual SIM, layout alignment in scripts (LTR, RTL), network ID, country
code etc.:
• http://www.developer.nokia.com/Resources
Library/Java/#!developers-guides/application-framework/system-
properties/nokia- specificsystem-properties.html

12. PERFORMANCE
• Only testing on real device will give correct perception of your apps’
performance.
• Make sure correct usage of threads, on some Series 40 device, having more
then 4 running threads doesn’t improving performance.
• Defining classes and members as static on Series 40 decreases performance.
• Audio playback performance (especially for games) requires per-device
optimization. Some devices do not support more then 4 “prefetch” calls on
sampled media.
• Sensor querying loops should be designed with low performance in mind.
• https://www.developer.nokia.com/Resources/Library/Java/#!developers-
guides/series-40-performance-optimisation.html

13. UI AND USER EXPERIENCE
• Asha Full Touch introduced new Look & Feel for LCDUI components, as
well as, new optimized version of LWUIT:
• http://www.developer.nokia.com/Resources/Library/Full_Touch
• http://projects.developer.nokia.com/LWUIT_for_Series_40
• There are significant additions to Nokia UI APIs, including support for
gestures optimized for multi-point touch, virtual keyboard, orientation,
new extensions to LCDUI (CategoryBar, IconCommand):
• http://www.developer.nokia.com/Resources/Library/Java/#!introduction
-to-java-me/new-features-in-java-runtime-200-for-series-40.html

14. THANK YOU!
Want to learn more?
www.developer.nokia.com
http://www.youtube.com/user/nokiadevforum
Michael Samarin, Director of Developer Training and Evangelism, Futurice