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New version of JamVM is avaliable





 New version of JamVM

JamVM - Java Virtual Mashine for IPhone, has been updated. New version 1.5.1b2-17 is avaliable through Cydia Installer.

   

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Written by admin

Wednesday, June 18th, 2008. 17:51

Java GUI on IPhone (example)



During Java instalation there was sample programm installed. It is called HelloJava. It is a bit more complicated than basic console HelloWorld-type application, that we tried to compile and run during this tutorial. HelloJava uses gui and SQLite. It uses several classes, that are bridges to IPhone's functionality (GUI, sound, SQL, etc). But all that it does is it reads contacts' first and last names from IPhone's database (throught SQL select statement) and shows them on the screen in GUI mode. It also produses simple sound in the end.

Here is a screenshot of the icon and application itself:

hellojava1.jpghellojava2.jpg

The application consists of several files:


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Tutorial: compile and run Java application on the IPhone



Run

This is a tutorial, that shows step by step how to use installed Java on the IPhone. Just in case you do not have Java installed on your IPhone there is a tutorial how to do it.

What we need is a working jailbraked IPhone with Java Installed. I used latest firmware 1.1.4, unlocked, jailbreaked and customized by winpwn.

Step 1: Create simple Java application, compile and run.


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Tutorial: install Java on the IPhone



Installed packages

This is a tutorial, that shows step by step how to install Java on the IPhone.

What we need is a working unlocked and jailbraked IPhone with Installer. I used latest firmware 1.1.4, unlocked, jailbreaked and customized by winpwn.

First of all I'd like to say we all want to use legal IPhones and operators. So everything written below is for testing purposes only :-) . Hopefully this technology will be avaliable on all IPhones sold worldwide. You also might need to recover your IPhone, so make sure you backed up all your data. I personally did everything without any problems and needs to recover. Everything you do is your responsibility, etc...

So let's start, because it's worth it! It's just one evening and you will be able to create your personal Java application, compile and run it on the IPhone, and amaze all your friends :-) .

There are two steps:


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Tutorial: install and use Java on the IPhone



With this tutorial you will be able to install Java on the IPhone, compile and run simple Java applications using IPhone.

I decided to split this tutorial into two different ones. So here they are:

Have fun and leave comments.

   

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IPhone's new patent application



patent.jpg

Apple recently filed a new patent application (us20080122796ki). On more than 370 pages lots of new potential features and enhancements for IPhone’s hardware and software are described.

The most interesting Hardware part is a GPS receiver and a camera for video conferencing.

On a software level, Apple describes addition of a text messaging (chat), in-line multimedia content (Quicktime and Flash) in the Safari browser. Further welcome additions described in the publication would include a dedicated blogging client, Java software downloads, MMS picture and video messaging, support for voice-activated commands, audio capture, video conferencing and more.

“[0142]Examples of other applications 136 that may be stored in memory 102 include other word processing applications, JAVA-enabled applications, encryption, digital rights management, voice recognition, and voice replication. ”

It sounds like Apple wants Java to be on the IPhone :-)

   

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Java VM for IPhone



JamVM is a new Java Virtual Machine which conforms to the JVM specification version 2 (blue book). In comparison to most other VM's (free and commercial) it is extremely small, with a stripped executable on PowerPC of only ~200K, and Intel 180K. However, unlike other small VMs (e.g. KVM) it is designed to support the full specification, and includes support for object finalisation, Soft/Weak/Phantom References, class-unloading, the Java Native Interface (JNI) and the Reflection API.JamVM currently only includes an interpreter (keeps it small). However, the interpreter is highly optimised, and performance is on par with a simple JIT. As most of the code is written in C it is easy to port to new architectures.


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Written by admin

Wednesday, May 28th, 2008. 15:29

JavaOne and Java for IPhone



JavaOne 2008

Here are some extracts from JavaOne 2008 conference press-releases about Java for IPhone:

"To show Java's prominence in multimedia, rock icon Neil Young made an appearance onstage to promote his video and music catalog offering based on Java and Blu-ray technology. A Sun official also briefly commented on Sun's predicament in trying to put Java on the Apple iPhone, leaving the ball in Apple's court to help make that happen."

"During the post-keynote press conference, Green gave a progress report on Sun's ongoing quest to put Java on the iPhone, something that Apple has not publicly, at least, supported.

Sun, Green said, is well along its way in creating the technology to enable Java to run on the phone, Green said. But he deferred to Apple, which governs which platforms can be distributed with the iPhone. It is Apple's right to decide this, Schwartz added."

   

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Written by admin

Thursday, May 8th, 2008. 17:00

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