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

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:

The application consists of several files:

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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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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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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:

• Tutorial: install Java on the IPhone

• Tutorial: compile and run Java application on the IPhone

Have fun and leave comments.

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

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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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."

JavaOne is one of the most interesting events in IT industry. We are expecting a lot of talks about Java and other technologies. One IPhone+Java - related talk was already mentioned at Java4IPhone.com (link). There are couple more of them.

• How to Port phoneME™ Advanced Software to Google Android, iPhone, OpenMoko, LiMO, and MoreHinkmond Wong (Sun Microsystems)

  May 07, 14:50 - 15:50

• Dancing Duke on Your PlayStation Portable: Porting phoneME™ Software to PlayStation Portable Max Mu (Sun Microsystems); Kuo Wang (iaSolution Technology Limited)

  May 08,19:30 - 20:20

• Extending Swing to Run Multitouch Applications (Multitouch Software)Michael Riecken (Trissential, LLC)

  May 09,16:10 - 17:10

Sessioin details:

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There are so many posts everywhere on the internet about Skype and the IPhone. On each IPhone forum it is possible to find something similar to "Is there a version of Skype for the IPhone?". And the answer was NO. There are some workarounds, but it's not what users want. However there is a great possibility, that all IPhone users will hear quite soon "YES there is Skype for the IPhone".

Skype announced a beta mobile version. It will be possible to chat, receive and make calls to Skype users and more. And it was written in... Yes, Java. So when Java will be avaliable for the IPhone all the users will be able to use Skype.

More information about Skype Mobile can be found here.

You can find out more about iphone development at Oysterlabs.

Here is a photo of the real IPod (same with IPhone) running a simple Java ME application:

Hinkmond Wong (Java Micro Edition group at Sun Microsystems) recently published a wonderful screenshot on his blog: