Jailbreak iPhone, iPod Touch, iPad

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.

1. Create file Java4IPhone.java and put simple Java hello-world code there. I used the following code:
2. Upload to IPhone. I used /tmp directory. For uploading I used IPhone Browser.
3. Run Terminal.
4. Use command java -fullversion or jamvm -fullversion to see if java is avaliable.
5. Use command jikes to invoke java compiler.
6. Go to /tmp directory, using command cd /tmp
7. Compile. We need to specify classpath to basic java packages. If we do not do that, jikes will produce an error (see screenshot). So use the following command: jikes Java4IPhone.java -cp /usr/lib/rt.jar
8. After compiling Java4IPhone.class file should appear in the same directory. To run use commandjava Java4IPhone
9. Take a look at the screenshots. Hopefully you’ll have something similar.

Step 2: Have fun!

Related posts

• Tutorial: install Java on the IPhone
• Java for IPhone / IPhone 3G firmware 2.0 exists
• DevTeam about firmware 2.2
• Step-by-step tutorial: untethered jailbreak iOS 4.2.1 on iPhone, iPod or iPad using Greenpois0n for Windows
• Step-by-step tutorial: untethered jailbreak iOS 4.2.1 on iPhone, iPod or iPad using Greenpois0n for Mac OS